These heads are on my 383 that we just installed. The engine was built by Jeff Taylor Performance. This video provided me with some excellent information.
@@brianholtmusic I have been very pleased. The dyno showed it made 515 hp and 545 lbvs. torque. I have just go the car back on the road and put about 100 miles. Very pleased so far.
@@brianholtmusic Bullet Camshaft 521 lift on the intake, 516 lift on the exhaust. 228 duration on the intake and 235 on the exhaust. Jeff Taylor of Jeff Taylor Performance built the engine for me.
@@howitzerman very nice, Thank You! We are currently building a 10.2 compression 383, using these same Project X 185 heads, but we will be using the Lunati VooDoo hyd flat tappet camshaft, it has 275/281 Adv Duration, 227/233 Dur@.050", .522" Intake/.537" Exhaust lift using 1.6 rockers, with 110° Lobe Seperation. We are hoping it runs well
This is exactly what my local machine shop told me about my project x 185’s. The valve job was quite bad and he put new seals and ID locators in it. I noticed the valve tip difference as well. Mine came with scratches in the deck surface. Getting ready to slap em on here soon.
That port shape is good, definitely would go with 2.05s, and a valve job to get the throat right, and yes, most of the airflow is due to the area 1 inch before and after the valve. Even 1.78 intake valves have enough area to support 250 cfm. The matching of the area 1 inch before the valve, and port will help as well, as well as proper port cross section and volume for the application. In the flow test, it would look like cylinder 1 was the one with smaller cc size, where as cylinder 2 would have the larger port, but as you said, with an intake that changes alot That exhaust really needs to be curved in for smoother flow.
Interesting to see what the numbers are versus what ProMaxx claims. What I noticed is overall max flow is about the same as claimed however the low flow numbers are a fair bit lower than what is claimed. Example they are claiming 155 cfm on Intake and 115 on Exhaust at 0.200 lift which is circa 20cfm higher than what you are seeing.
After the 200 cc review, kinda surprised the VJ wasn't perfect. Also. That missing chamfer on the intake valves. Just use a small file... Or even a bench grinder or sander if your confident.
This head is going back to Promaxx. I found that the OD of the guides were different between the "matched" set, and with the bad valve job on this one (the other looked ok) and 2 ports being different cc, I am exchanging that. Mostly because of the guides. So 1 going back. Already got the replacement head. The finish looks different and while the valve job looks ok its much more sunk into the seat, or the seat is sunk more into the head than on the other head I should say. The cc of the chambers was supposed to be 60cc but they said they couldnt go more cuz it was getting into the seat so the first 2 heads were 61.5cc. Ok, but the replacement head averages 62.4cc with a range of 61.8 on one end and 62.8 on the other end. So doesnt seem like it was milled exactly straight? So of the bigger chambers on that head could also be due to the sunk down seats. Wish I spent the extra $900 on AFR. BTW, I switched to a roller cam and on the roller springs the ID locator to the spring is much better and doesnt move around.
I don't think it was a milled straight thing. I think it has core shift. It is inevitable on an as cast head to have one end of the heads to be bigger or smaller than the other end. I have seen it many times when I had heads digitized.
Eric my take on the intake valve is that they ground the tip so all the valves ended up being same height so the push rods would be the same length. Ran into this before with Promax. Problem is reduces clearance at rocker arm. Please correct me if I am wrong. Thanks. Love the channel.
I wonder... did they just grind down the intake valve stems to make it look like seats were all cut to the same depth? I've never seen valve stems with zero chamfer. Work like that would make me order bare heads, and if I didn't like a particular casting just send it back.
Can you tell me what valve seal part number and spring retainers you would put on these heads? I ordered a set but would like to make these 2 upgrades before I install the heads on my build.
I plan on purchasing these Heads for my Dodge 5.9 magnum 360 gas.. It's a budget build for me.. I am going to give the Cylinder Heads a basic Port Head work on my own.. I don't plan to going all out pro workmanship.. I jus wanna update where I can and increase HP with good parts that I can afford to do so.. Please tell me what is best to start with using these Heads.. Thanks... Details Dodge 5.2L & 5.9L Magnum Replaces Factory Cylinder Head with OE Casting Numbers 0466 or 6671 Cylinder Head Assembly Includes: (1) Stock Cylinder Head w/62CC combustion chamber (8) Stock Valve Springs (8) Stock Valve Spring Retainers & Keepers (8) Valve Stem Oil Seals (4) Stock 1.920 in. Diameter Intake Valves (4) Stock 1.625 in. Diameter Exhaust Valves Features: Intake port dimensions - 1.080 in. Wide x 2.075 in. High Intake Port Runner Volume - 179cc Specifications: Quantity Sold individually Cylinder Head Style Assembled Guideplates Included No Rocker Arm Studs Included No Accessory Bolt Holes Drilled No Cylinder Head Material Cast iron CNC-Machined Combustion Chamber No CNC-Machined Exhaust Runner No CNC-Machined Intake Runner No Damper Spring Included No Exhaust Valves Included Yes Heat Crossover No Intake Valves Included Yes Locks Included Yes Machined for O-Ring No Retainers Included Yes Rocker Arm Nuts Included No Rocker Arms Included No Steam Holes Drilled No Valve Guides Included Yes Valve Seats Machined No Valve Springs Included Yes Valve Stem Seals Included Yes
Hey Eric. I were talking about this video.... Maybe it looks worse than it is (the scratches) Maybe i have misunderstood the rest, with the valve job etc.
Check out the .400 and .500 numbers they list for the Project X 200cc sbc heads. Is something wrong there? They show to be lower than the 185 by a long ways
They told me the .500 lift number on the 200cc was a misprint because they do a lot of copy and paste?! Couldn't take time to make sure the ad was right? Told me that in I think December. Its June now and the ad still isnt fixed. Cant remember what they said the actual flow is, I think he said like 270.
Nothing like an expensive learning curve realizing those seals only belong on factory bone stock assembly line built engines while their single valve spring rated up to 700” belong in the trash! Sadly, it doesn’t matter if their made and assembled in the USA or in that pleasant country china one size fits all type preassemble cylinder heads cost allot more in the end!!
No, it is not a good head. I mean the valve job is so bad you have to change the valves? Yuck. Poor spring seats, valve tips not finished machined. Those things are a wreck. Let me ask you this Eric ; Buy these and spend the money to have them fixed or buy the AFRs and have them good(reasonably)out of the box?
With these cheapo Chinese heads I’d take them to a machine shop for a valve job anyways just to make sure it’s right. I wouldn’t trust a mass produced Chinese cylinder head to get it right or even use quality parts.
Thanks Eric. I order my heads bare. Sometimes with valves. That way I can put on the hardware that it needs. Mostly good stuff from Promaxx.
These heads are on my 383 that we just installed. The engine was built by Jeff Taylor Performance. This video provided me with some excellent information.
How does your 383 perform with these heads?
@@brianholtmusic I have been very pleased. The dyno showed it made 515 hp and 545 lbvs. torque. I have just go the car back on the road and put about 100 miles. Very pleased so far.
@@howitzerman Awesome! That is making great power for a 185cc head! What camshaft are you using?
@@brianholtmusic Bullet Camshaft 521 lift on the intake, 516 lift on the exhaust. 228 duration on the intake and 235 on the exhaust. Jeff Taylor of Jeff Taylor Performance built the engine for me.
@@howitzerman very nice, Thank You! We are currently building a 10.2 compression 383, using these same Project X 185 heads, but we will be using the Lunati VooDoo hyd flat tappet camshaft, it has 275/281 Adv Duration, 227/233 Dur@.050", .522" Intake/.537" Exhaust lift using 1.6 rockers, with 110° Lobe Seperation. We are hoping it runs well
This is exactly what my local machine shop told me about my project x 185’s. The valve job was quite bad and he put new seals and ID locators in it. I noticed the valve tip difference as well. Mine came with scratches in the deck surface. Getting ready to slap em on here soon.
I think if the problems get resolved the head will do well.
those springs need an OD locater, seen those horrible seals ripped apart by walking springs, bits all through the motor! , love your reviews Eric!
LOL the closed caption thought you said "wine gun erasing"!
That port shape is good, definitely would go with 2.05s, and a valve job to get the throat right, and yes, most of the airflow is due to the area 1 inch before and after the valve. Even 1.78 intake valves have enough area to support 250 cfm.
The matching of the area 1 inch before the valve, and port will help as well, as well as proper port cross section and volume for the application.
In the flow test, it would look like cylinder 1 was the one with smaller cc size, where as cylinder 2 would have the larger port, but as you said, with an intake that changes alot
That exhaust really needs to be curved in for smoother flow.
Interesting to see what the numbers are versus what ProMaxx claims. What I noticed is overall max flow is about the same as claimed however the low flow numbers are a fair bit lower than what is claimed. Example they are claiming 155 cfm on Intake and 115 on Exhaust at 0.200 lift which is circa 20cfm higher than what you are seeing.
After the 200 cc review, kinda surprised the VJ wasn't perfect.
Also. That missing chamfer on the intake valves. Just use a small file... Or even a bench grinder or sander if your confident.
This head is going back to Promaxx. I found that the OD of the guides were different between the "matched" set, and with the bad valve job on this one (the other looked ok) and 2 ports being different cc, I am exchanging that. Mostly because of the guides. So 1 going back. Already got the replacement head. The finish looks different and while the valve job looks ok its much more sunk into the seat, or the seat is sunk more into the head than on the other head I should say. The cc of the chambers was supposed to be 60cc but they said they couldnt go more cuz it was getting into the seat so the first 2 heads were 61.5cc. Ok, but the replacement head averages 62.4cc with a range of 61.8 on one end and 62.8 on the other end. So doesnt seem like it was milled exactly straight? So of the bigger chambers on that head could also be due to the sunk down seats. Wish I spent the extra $900 on AFR.
BTW, I switched to a roller cam and on the roller springs the ID locator to the spring is much better and doesnt move around.
I don't think it was a milled straight thing. I think it has core shift. It is inevitable on an as cast head to have one end of the heads to be bigger or smaller than the other end. I have seen it many times when I had heads digitized.
Seems like a decent head for the price. Thanks for another great video!
Eric my take on the intake valve is that they ground the tip so all the valves ended up being same height so the push rods would be the same length. Ran into this before with Promax. Problem is reduces clearance at rocker arm. Please correct me if I am wrong. Thanks. Love the channel.
Could be.
I have a set of the 215’s project X had em for about 6 months … goin on a 406 .. should make some pretty good steam ..
Do you still like them ? Thinking of buying
By the time you take these to machine shop, have the valve job done, and new intake valves, does it even make sense to go with these?
I wonder... did they just grind down the intake valve stems to make it look like seats were all cut to the same depth? I've never seen valve stems with zero chamfer. Work like that would make me order bare heads, and if I didn't like a particular casting just send it back.
Can you tell me what valve seal part number and spring retainers you would put on these heads? I ordered a set but would like to make these 2 upgrades before I install the heads on my build.
Is there any power gain in having a head that flows more than it does through the intake and carb
I plan on purchasing these Heads for my Dodge 5.9 magnum 360 gas.. It's a budget build for me.. I am going to give the Cylinder Heads a basic Port Head work on my own.. I don't plan to going all out pro workmanship.. I jus wanna update where I can and increase HP with good parts that I can afford to do so..
Please tell me what is best to start with using these Heads.. Thanks...
Details
Dodge 5.2L & 5.9L Magnum
Replaces Factory Cylinder Head with OE Casting Numbers 0466 or 6671
Cylinder Head Assembly Includes:
(1) Stock Cylinder Head w/62CC combustion chamber
(8) Stock Valve Springs
(8) Stock Valve Spring Retainers & Keepers
(8) Valve Stem Oil Seals
(4) Stock 1.920 in. Diameter Intake Valves
(4) Stock 1.625 in. Diameter Exhaust Valves
Features:
Intake port dimensions - 1.080 in. Wide x 2.075 in. High
Intake Port Runner Volume - 179cc
Specifications:
Quantity
Sold individually
Cylinder Head Style
Assembled
Guideplates Included
No
Rocker Arm Studs Included
No
Accessory Bolt Holes Drilled
No
Cylinder Head Material
Cast iron
CNC-Machined Combustion Chamber
No
CNC-Machined Exhaust Runner
No
CNC-Machined Intake Runner
No
Damper Spring Included
No
Exhaust Valves Included
Yes
Heat Crossover
No
Intake Valves Included
Yes
Locks Included
Yes
Machined for O-Ring
No
Retainers Included
Yes
Rocker Arm Nuts Included
No
Rocker Arms Included
No
Steam Holes Drilled
No
Valve Guides Included
Yes
Valve Seats Machined
No
Valve Springs Included
Yes
Valve Stem Seals Included
Yes
Sell it and buy a Chevy
Hey Eric. I were talking about this video.... Maybe it looks worse than it is (the scratches)
Maybe i have misunderstood the rest, with the valve job etc.
Those problems have been largely resolved and the heads are good. I have sold and used many.
GUESS WHOS BACK
Check out the .400 and .500 numbers they list for the Project X 200cc sbc heads. Is something wrong there? They show to be lower than the 185 by a long ways
They told me the .500 lift number on the 200cc was a misprint because they do a lot of copy and paste?! Couldn't take time to make sure the ad was right? Told me that in I think December. Its June now and the ad still isnt fixed. Cant remember what they said the actual flow is, I think he said like 270.
@@curtthompson2787 i am would say 260 would be a sure bet, however you never know until you know.
so valve job /seat and seals so I should get them checked out before instalation
It depends if you want insurance it’s right.
awesome eric :o)
Its supposed to be a 5 angle right?
Did these heads have the 8mm valves? I talked to Promaxx and they have switched these to 11/32” valves now.
They had 11/32 you can order them either way.
You really need to check out the captions 😂 apparently your company is wine gunner racing , there is some real crackers
The valves need to be all pulled out, and chamfer the tips. You will find out why later on if you don't.
I chamfered them. Came out pretty good. Thank you for the tip.
Me encantan
Excellent review
Are you really saving $$ on these heads vs the others
if you have to do a valve job?
Not much
Great video
Thanks
👍💪
Nothing like an expensive learning curve realizing those seals only belong on factory bone stock assembly line built engines while their single valve spring rated up to 700” belong in the trash!
Sadly, it doesn’t matter if their made and assembled in the USA or in that pleasant country china one size fits all type preassemble cylinder heads cost allot more in the end!!
How thick are the decks ?
.75"
No, it is not a good head. I mean the valve job is so bad you have to change the valves? Yuck. Poor spring seats, valve tips not finished machined. Those things are a wreck. Let me ask you this Eric ; Buy these and spend the money to have them fixed or buy the AFRs and have them good(reasonably)out of the box?
With these cheapo Chinese heads I’d take them to a machine shop for a valve job anyways just to make sure it’s right. I wouldn’t trust a mass produced Chinese cylinder head to get it right or even use quality parts.
It’s pronounced: “chamfer”.