So glad to see this. I have 95 1ton that I’m working on, with these heads. Garage ported the heads and had them milled .030. Getting screw in rocker studs now. Have a solid lift and hydraulic flat tappet cam that I bought to choose between. Can’t wait to see where your results end up
This is going to be an awesome series transforming boat anchors into performance heads! Would be cool if you can even maintain their ability to launch of the line without quickly running out of air. An extra around 100 CFM is very respectful if you can get that. Those might be slightly altered because the max intake flow I have seen those do is 168 in factory form. Thanks for doing these, the only other guy that ported these on yt didn't have a flow bench to show what he did improved flow.😎👍
I had a 5.7 tbi swapped into my cj5 and was disappointing. My old 304 AMC would rev almost to 6k and outrun the 5.7. swapped it out for a 400 I pulled out of a square body to put a 454 in. Mild cam, but otherwise stock. I changed the throttle body to a 7.4 unit with the factory GM spreadbore adapter and added a tune to the prom chip. It made a significant difference in power and it runs awesome on the tbi system. Still tops out around 5500 rpm, but it gets there quickly. Anyway, that's my tbi story.
@@servediocylinderheads wonderful ! I enjoy your work/ results and seeing “ what air does “. Airflow is always fascinating to me . Air tunnels / measurements are fascinating to me well. In my time we have gone from paying no attention to airflow much past basics to being able to use negative pressure to “ stick a car “ to a track. Heads , intakes and carbs / induction systems that flowed so badly it’s a wonder they ran, to pretty sophisticated today . Anyway, I enjoy your work, teaching .
I just found your channel and this swirl Port series. I have a 1988 c1500 with a 305 TBI that is sporting the same heads. I have a spare set that I had resurfaced to get some extra compression that have not done any portwork at all yet. I just cleaned up my Edelbrock performer TBI and have a bunch of gaskets ordered along with some throttle body and injector pod spacers. So far the engine is bone stock with nothing touched except for the addition of an Dynamic EFI ebl flash system. I've been watching some of the David vizard vortec head porting videos and when I looked at the ports on these heads they did kind of slightly resemble the vortec chamber. I have to say I'm excited to see where this goes. If you have any experience with the Dynamic EFI please lets know as I haven't been able to get much tech support from the company other than look on their website.
Looking forward to this series already! I just started porting a set of 305 HO heads (416 casting). Thinking of using them on a budget street/strip 350 with a healthy circle track flat tappet cam.
Very Impressive! Seems like a bowl that deep might like a 50 degree seat. Also seems likely that it would throw dykem even further down the bore that way.
I built a 327 with these heads once, parts I had laying around. I think the only thing I bought new was a rering kit and one piece to 2 piece rear main adapter. Basically a 307 crank in a 638 block. Trick flow roller cam for TPI. Summit dual plane and a Holley 600. Worked great on the street and autocross. I cut the ramp down flush with the guide and cleaned up the bowls. No idea if it helped. Ran out of steam around 5000.
@@servediocylinderheads the camshaft was designed for Tuned Port Injection. I don't recall the specs, could have been part of the issue. I was tempted to try 2.02/1.60 valves, but I have seen so many of them crack. Very excited to see how they do, always thought they had potential. Also not every build is about peak HP.
I have a 92 350 Everything brand new Exept the heads and pistons Eagle crank Stage 4 Cam 750 CFM carb I wondering if I keep the stock 193 heads I have would all the power upgrades be useless it’s going into a 90 camero RS
@@zyroonconsle6069 Heads flow about 185 cfm stock. It will not match a stage four cam, if it is a long duration cam. I would do at least some bowl work and spring upgrade. Thanks
These are some of the best heads ever designed. 24 mpg 3:10 on a 305. You can tow a boat at highway speed in overdrive. They're designed to work from idle up
Many years ago, I installed swirl port truck heads on a 350 tuned port Camaro. Road test it would hardly rev past 3500 rpms. WHAT A TURD. Guess it was better than the stock cracked warped heads. Sent it the auction, and never saw it again.
I cleaned my heads up measured at 65cc and did very minimal port matching with the plan to build for max torque. I put in flat tops, 540 lift cam(with springs and clearing) with 206/210 duration. Measured 10.5 to 1 static compression. Put up 460 torque 330hp on the engine dyno.
The 267 if im not mistaken is a 3.5" bore motor so the 193 chamber is quite a bit bigger than the bore and the intake valve might hit the top of the block , the 187 or 059 castings also swirlport heads but from the 305 would be better candidates on 267 .... Your 193's on a 305 with a little bore notching and 4" bore head gasket will work and add in flat top pistons for around 9:1 compression could be a kool little 5 liter setup
@@luckyPistonPersonally for a 267 I would use a 601 305 head. 53cc chamber and they can easily be milled a bit. Just changing the stock dished valves for flat valves decreases the chamber volume to about 49-50cc. The stock GM valves are dished if you ever look at one.
I ported a set of these a few years ago, and hopefully I see some similarities in how we improve the flow in these. Definitely tuned in to this series. These heads are definitely the screwballs of the SBC world, IMO.
I'm not a Chevy guy so it's no surprise that I've never heard of these heads and I'm kinda glad I've never seen them before. The bowl looks like someone straight out of engineering school designed them and instead of testing the idea, he just sent it straight to production. Sure you got good swirl but swirl should be secondary to flow in my opinion but maybe I should just stick to MOPAR??? 🤷♂️
well i got a set and im about to sent them off to a machine shop its going on a hot rod /touring car ..so iwant it to have some shit and git and a lil cam at idle.....seeing all this makes me feel alot better ..used to a prevortec engine was just a clunker to me ..goofy teens putting glass packs on them and making noise ..and noticed they was slow ..my old 283 would would have a wicked sound and the speed...but they are getting rare so i just dont wanna mess with them .and try to get something that parts are plentiful ..every scrap yard has them 80s and 90s trucks
@@servediocylinderheads bad news ..the local shop would not do the work to them told him I wanted them fixed up he told me no .,. Told him about the 093 set ..told me bring them ..lot less work alot more outcome ..huh will see
I have a set of these ported by a professional 25 years ago. Never run now on a 350 with howards cam 221 duration on 108 with 500 lift. 9.5 compression going in a 76 square body 4x4. Should pull hard.
About 3 minutes in where you're kicking around if the intake valves had a back cut and if the heads ever had any work done to them. While I was listening I was looking at the surface of the head and it almost looks like cutter marks where they were resurfaced kind of badly. Could just be my eyes.
I have an 87 squarebody 2500 4x4 with these and it runs really strong would beat my neighbors 98 vortech in a drag not sure why lol they are great heads for economy to I get 18 mpg with them
The higher compression version was better. My Dad had a 89 Suburban I did the throttle body and added 1.6 roller rockers. Great running engine. The one ton with lower compression was horrible.
I made 330 hp and 420 tq out of one of those 1-ton 350s (Mid 2000s Goodwrench 20270 crate engine) with the 810 swirl ports. Heads were stock save for some milling and better springs. I put 0.016" compressed steel shims on it to get it up to 9.2:1 from 8.75:1 with the 18cc dished pistons. I swapped the GM 194/203 @ 0.050 flat tappet cam for a custom 218/218 @ 0.050 roller cam with 0.510I/0.480E lift using 1.60I/1.52E full roller rockers. Cam was ground on a 108 LSA and installed on a 104 ICL. Used an Edelbrock 3704 intake manifold bored to 2" to use a 454 TBI unit. 1" tall oval open center spacer. Used a 454 TBI van air cleaner that had a massive cool air duct and no hot air connection to the exhaust but also had a built in power bowl to help the TBI breathe around the injectors. Extremely long Thorley tri-ys with collectors even with the 700r4 crossmember they made for the G-vans. Kept the GM 2.5" catless duals, but added a DrGas X-pipe roughly under the driverside mid row seat and swapped the restrictive stock mufflers for 18" case Magnaflows. Put my 5,300 lbs 1983 G20 conversion van into the mid 14s with a 700r4 using the stock torque converter and 3.08 gears. The 810s flowed 192 cfm @ 0.450.
My online 1/4 mile calculator has you doing 93 mph in the traps with a 14:69 ET , i'm curious what RPM you were turning with your tire size to give me an idea of how much (%) that 700r4's torque convertor was slipping when you hit the end of the strip ? tks.
@@luckyPiston Been a while, but I want to say it had P295/50R15s and I think I had it shifting at 5,300 rpm 1-2 and 5,500 rpm 2-3 in Drive off governor adjustments. I remember MPH being around 91-92 and the transmission was just shifting into 3rd. Went through the traps at about 4K @ 91-92 mph.
@@chrisreynolds6520 So with those #'s your TC slippage was 10.525% .... i didn't think it would be that much but you are pretty much right on your torque peak so would you say the motor was still pulling pretty hard when you went through the traps ?
To run a 9.95 in a 3200 lb car you need 725 Hp ! .. so yeah what you were saying about it being nice if the short block was a 406 might be more like it'll be mandatory :)
@@servediocylinderheads I used a online calculator , Hp is at the flywheel, a 9.95 is 145 mph so with 4.11 gears 28" tire you're up at 7150 rpm going through the traps.. The online calculator may be factoring in a pretty soft launch ?
Turning junk into performance parts is always worth my attention. Carry on mister.
That was how I always did it because I was usually broke! If not I was always cheap!!!
Gonna have to hold on for this one if its gonna run 9s
So glad to see this. I have 95 1ton that I’m working on, with these heads. Garage ported the heads and had them milled .030. Getting screw in rocker studs now. Have a solid lift and hydraulic flat tappet cam that I bought to choose between. Can’t wait to see where your results end up
Thanks
This is going to be an awesome series transforming boat anchors into performance heads! Would be cool if you can even maintain their ability to launch of the line without quickly running out of air.
An extra around 100 CFM is very respectful if you can get that. Those might be slightly altered because the max intake flow I have seen those do is 168 in factory form. Thanks for doing these, the only other guy that ported these on yt didn't have a flow bench to show what he did improved flow.😎👍
Yeah, I gave him some pointers. Thanks
I had a 5.7 tbi swapped into my cj5 and was disappointing. My old 304 AMC would rev almost to 6k and outrun the 5.7. swapped it out for a 400 I pulled out of a square body to put a 454 in. Mild cam, but otherwise stock. I changed the throttle body to a 7.4 unit with the factory GM spreadbore adapter and added a tune to the prom chip. It made a significant difference in power and it runs awesome on the tbi system. Still tops out around 5500 rpm, but it gets there quickly. Anyway, that's my tbi story.
Interesting series Charles.
Like to see what you come up with.
Have a good evening.
Thanks Ed.
Love your work charles; doing a similar project different goals. Im doing 187s on a 3" stroke 265ci. can't wait to see how yours turn out
They may work out really well for a small engine. Think about filling the floor with epoxy.
@@servediocylinderheadsdo you think the epoxy would survive in a daily driver?
@@olivierfaucher3426 If done right it will never fail.
This is going to be interesting. Thanks for posting!
It will be fun! Thanks
I was wondering when you was going to do a set of these. Looking forward to what you come up with.
Took forever to find some. There are none local to me. Thanks
Cool project Charlie.
Thanks Grahamm!
Any idea what happened to the other "Mission Impossible" ?
Yep, still finishing to open chamber heads, finished three intake manifolds and exhaust manifolds.
@@servediocylinderheads wonderful !
I enjoy your work/ results and seeing “ what air does “.
Airflow is always fascinating to me .
Air tunnels / measurements are fascinating to me well.
In my time we have gone from paying no attention to airflow much past basics to being able to use negative pressure to “ stick a car “ to a track.
Heads , intakes and carbs / induction systems that flowed so badly it’s a wonder they ran, to pretty sophisticated today .
Anyway, I enjoy your work, teaching .
@@fr.rustymatheny7707 Thanks!
YES! Excellent. Looking forward to this.
Me too. Thanks
I just found your channel and this swirl Port series. I have a 1988 c1500 with a 305 TBI that is sporting the same heads. I have a spare set that I had resurfaced to get some extra compression that have not done any portwork at all yet. I just cleaned up my Edelbrock performer TBI and have a bunch of gaskets ordered along with some throttle body and injector pod spacers. So far the engine is bone stock with nothing touched except for the addition of an Dynamic EFI ebl flash system.
I've been watching some of the David vizard vortec head porting videos and when I looked at the ports on these heads they did kind of slightly resemble the vortec chamber. I have to say I'm excited to see where this goes. If you have any experience with the Dynamic EFI please lets know as I haven't been able to get much tech support from the company other than look on their website.
I don't have any experience. Sorry
Looking forward to this series already! I just started porting a set of 305 HO heads (416 casting). Thinking of using them on a budget street/strip 350 with a healthy circle track flat tappet cam.
Crack check them well, they actually clean up well.
Will do, I was lucky they are a very clean looking set.
Very Impressive! Seems like a bowl that deep might like a 50 degree seat. Also seems likely that it would throw dykem even further down the bore that way.
That seems logical. Thanks
I built a 327 with these heads once, parts I had laying around. I think the only thing I bought new was a rering kit and one piece to 2 piece rear main adapter. Basically a 307 crank in a 638 block. Trick flow roller cam for TPI. Summit dual plane and a Holley 600. Worked great on the street and autocross. I cut the ramp down flush with the guide and cleaned up the bowls. No idea if it helped. Ran out of steam around 5000.
The ones I did in the 80's were good for 6500 in a 383 with a short cam. We will find out what these will do. Thanks
@@servediocylinderheads the camshaft was designed for Tuned Port Injection. I don't recall the specs, could have been part of the issue. I was tempted to try 2.02/1.60 valves, but I have seen so many of them crack. Very excited to see how they do, always thought they had potential. Also not every build is about peak HP.
I have a 92 350 Everything brand new Exept the heads and pistons Eagle crank Stage 4 Cam 750 CFM carb I wondering if I keep the stock 193 heads I have would all the power upgrades be useless it’s going into a 90 camero RS
@@zyroonconsle6069 Heads flow about 185 cfm stock. It will not match a stage four cam, if it is a long duration cam. I would do at least some bowl work and spring upgrade. Thanks
@@servediocylinderheads I’m doing a spring upgrade but I’ve never ported anything and I don’t want to mess up the guides
@@zyroonconsle6069 What are the cam specs?
@@servediocylinderheads Duration 281/289, Lift .480/.488 109 Lobe Seperation
@@zyroonconsle6069 Some porting would help but it will run fine with stock ports.
Servedio Super Swirl 193s. Done.
That is what Stevie calls them!
Wait, he calls them swirlies!
These are some of the best heads ever designed. 24 mpg 3:10 on a 305. You can tow a boat at highway speed in overdrive. They're designed to work from idle up
Don't tell anyone!
Many years ago, I installed swirl port truck heads on a 350 tuned port Camaro. Road test it would hardly rev past 3500 rpms. WHAT A TURD. Guess it was better than the stock cracked warped heads. Sent it the auction, and never saw it again.
Tuned port barely flows 200 after porting!!!
I cleaned my heads up measured at 65cc and did very minimal port matching with the plan to build for max torque. I put in flat tops, 540 lift cam(with springs and clearing) with 206/210 duration. Measured 10.5 to 1 static compression. Put up 460 torque 330hp on the engine dyno.
Good info! Thanks
Just what I've been waiting 4
Excellent. Thanks
Looking forward to seeing what you get out of them.
Thanks
This should be interesting. I have two sets of these lying around. Would these be a good candidate for small inch (267) mpg motor?
No... chamber to big..would be very low compression
@@timc2510Compression is key! Good point.
They do make a 305 version 217 casting? Modern 305 vortec is better.
The 267 if im not mistaken is a 3.5" bore motor so the 193 chamber is quite a bit bigger than the bore and the intake valve might hit the top of the block , the 187 or 059 castings also swirlport heads but from the 305 would be better candidates on 267 .... Your 193's on a 305 with a little bore notching and 4" bore head gasket will work and add in flat top pistons for around 9:1 compression could be a kool little 5 liter setup
@@luckyPistonPersonally for a 267 I would use a 601 305 head. 53cc chamber and they can easily be milled a bit. Just changing the stock dished valves for flat valves decreases the chamber volume to about 49-50cc. The stock GM valves are dished if you ever look at one.
I ported a set of these a few years ago, and hopefully I see some similarities in how we improve the flow in these. Definitely tuned in to this series. These heads are definitely the screwballs of the SBC world, IMO.
I like the crazy design. Thanks
I'd like to see some videos of 193s for maximum torque below 5000rpms along with stock tbi intake port job for maximum torque below 5000rpm
Stay tuned, next video will be similar to my first porting of these heads. Stock valve sizes mostly stock valve job. Still a good step up in air flow!
Stock intake is a disaster. Needs tons of work. Thanks
@@servediocylinderheadswould love to see the worked manifold.
@@matthemberry Tbi? I have 2 both worked
@@matthemberry I wish I had a 100% stock tbi manifold. I could compare to my molded stuff.
Ill stick around for this project to the end !
Cool. Thanks
This is going to be interesting, 9s all motor?
That is what we are going to try for! Thanks
I'm not a Chevy guy so it's no surprise that I've never heard of these heads and I'm kinda glad I've never seen them before. The bowl looks like someone straight out of engineering school designed them and instead of testing the idea, he just sent it straight to production. Sure you got good swirl but swirl should be secondary to flow in my opinion but maybe I should just stick to MOPAR??? 🤷♂️
No doubt!
Almost certain the set of TBI heads on my 92 chevy did not have the backcuts
I agree, same with my 1988 versions. Thanks
well i got a set and im about to sent them off to a machine shop its going on a hot rod /touring car ..so iwant it to have some shit and git and a lil cam at idle.....seeing all this makes me feel alot better ..used to a prevortec engine was just a clunker to me ..goofy teens putting glass packs on them and making noise ..and noticed they was slow ..my old 283 would would have a wicked sound and the speed...but they are getting rare so i just dont wanna mess with them .and try to get something that parts are plentiful ..every scrap yard has them 80s and 90s trucks
@@jaysaw8151 They tune up well. Thanks
@@servediocylinderheads bad news ..the local shop would not do the work to them told him I wanted them fixed up he told me no .,. Told him about the 093 set ..told me bring them ..lot less work alot more outcome ..huh will see
@@jaysaw8151 Not familiar with 093 castings. Sorry
I have a set of these ported by a professional 25 years ago. Never run now on a 350 with howards cam 221 duration on 108 with 500 lift. 9.5 compression going in a 76 square body 4x4. Should pull hard.
Looks like a good cam for these in a truck application. Thanks
About 3 minutes in where you're kicking around if the intake valves had a back cut and if the heads ever had any work done to them. While I was listening I was looking at the surface of the head and it almost looks like cutter marks where they were resurfaced kind of badly. Could just be my eyes.
I think they were done at some point. Bottom cut is not stock and they did flow more than I have read they flow. Thanks
Name ideas:
Operation Motown Magic
Mission Detroit Shakedown.
I like Servedio Super Swirlies! Stevie may have really nailed it with that one.
Detroit attitude!
no back cut on exhaust valve
Ever...usually. thanks
No matter what brand you are porting there is always something to learn says this mopar guy.
I like that. Thanks!
Never seen a pushrod bulge that prominent on a SBC head!
Horrible
Show us some magic Charles!
I will do my best. Thanks
If you could get those heads with a 305 (331?) stroker to go low to mid 10s, that would be amazing. And with something that weighed about 2800 lbs.
The 331 I have is .030 over 327. But that would be cool. Yes, it would need a light chassis. Thanks
They should work well from 4000 down,if that's the head I'm thinking about.
They are designed as a truck head, high torque, fuel economy. We will toss some of that!
I have an 87 squarebody 2500 4x4 with these and it runs really strong would beat my neighbors 98 vortech in a drag not sure why lol they are great heads for economy to I get 18 mpg with them
The higher compression version was better. My Dad had a 89 Suburban I did the throttle body and added 1.6 roller rockers. Great running engine. The one ton with lower compression was horrible.
Gearing you probably have 3.73 and he prbly has 3.55
I made 330 hp and 420 tq out of one of those 1-ton 350s (Mid 2000s Goodwrench 20270 crate engine) with the 810 swirl ports. Heads were stock save for some milling and better springs. I put 0.016" compressed steel shims on it to get it up to 9.2:1 from 8.75:1 with the 18cc dished pistons. I swapped the GM 194/203 @ 0.050 flat tappet cam for a custom 218/218 @ 0.050 roller cam with 0.510I/0.480E lift using 1.60I/1.52E full roller rockers. Cam was ground on a 108 LSA and installed on a 104 ICL. Used an Edelbrock 3704 intake manifold bored to 2" to use a 454 TBI unit. 1" tall oval open center spacer. Used a 454 TBI van air cleaner that had a massive cool air duct and no hot air connection to the exhaust but also had a built in power bowl to help the TBI breathe around the injectors. Extremely long Thorley tri-ys with collectors even with the 700r4 crossmember they made for the G-vans. Kept the GM 2.5" catless duals, but added a DrGas X-pipe roughly under the driverside mid row seat and swapped the restrictive stock mufflers for 18" case Magnaflows. Put my 5,300 lbs 1983 G20 conversion van into the mid 14s with a 700r4 using the stock torque converter and 3.08 gears. The 810s flowed 192 cfm @ 0.450.
Great set up! Thanks
Thin head gaskets help! Love them.
My online 1/4 mile calculator has you doing 93 mph in the traps with a 14:69 ET , i'm curious what RPM you were turning with your tire size to give me an idea of how much (%) that 700r4's torque convertor was slipping when you hit the end of the strip ? tks.
@@luckyPiston Been a while, but I want to say it had P295/50R15s and I think I had it shifting at 5,300 rpm 1-2 and 5,500 rpm 2-3 in Drive off governor adjustments. I remember MPH being around 91-92 and the transmission was just shifting into 3rd. Went through the traps at about 4K @ 91-92 mph.
@@chrisreynolds6520 So with those #'s your TC slippage was 10.525% .... i didn't think it would be that much but you are pretty much right on your torque peak so would you say the motor was still pulling pretty hard when you went through the traps ?
Price for bow tie bbc heads,
Pro comp bbc
Aluminum sbc vetted 58cc heads 90
Not sure what you are asking.
hot rodding at its finest
I like it! Thanks
Great chennel name!
Good torque heads .. done by 5k rpm
Stock
To run a 9.95 in a 3200 lb car you need 725 Hp ! .. so yeah what you were saying about it being nice if the short block was a 406 might be more like it'll be mandatory :)
That seems high. Thanks
@@servediocylinderheads I used a online calculator , Hp is at the flywheel, a 9.95 is 145 mph so with 4.11 gears 28" tire you're up at 7150 rpm going through the traps.. The online calculator may be factoring in a pretty soft launch ?
@@luckyPiston I don't know.
Looks like someone got to it with a bowl hog just my guess
I agree, thanks
I want to see this but I'm sorry, I just can't stay focused with the Yada Yada on and on. Sorry
Watch it at 2x speed. That is what I do! Haha
Worst head ever🤔 no from 0-3000 they flow the best. Build a crawler
6 speed transmission & a light weight car. Let’s do it! Bunny Hopper
@@Dwlukinbill Glad you think so. I don't!
@@servediocylinderheads
What that those heads are it is worst ever? I don’t think they are. “no” as I stated. or was it my flow opinion
😎
Better street head than vortec
4500 & down!
193 will beat vortec up to 4500 !!!
@@TerryBall-v8l Stock
"Mission Berzerka Swirl" ...
Berzerka?
Hey bro are you going to get around to actually doing anything or are you just gonna yap ?
Is there a question in there?