WHAT LS HEADS WORK BEST WITH A TURBO? CATHEDRAL PORT OR REC-PORT HEADS? WHICH HEADS MAKE MORE LS HP?
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- เผยแพร่เมื่อ 19 ก.ย. 2024
- CAN I RUN BOOST WITH REC-PORT HEADS? DO REC-PORT HEADS MAKE MORE POWER THAN CATHEDRAL-PORT HEADS? WHAT HEADS ARE BEST WITH A TURBO? HOW MUCH POWER CAN I MAKE WITH A TURBO ON MY LS? CHECK OUT THIS VIDEO WHERE I ILLUSTRATED HOW WELL FACTORY REC-PORT HEADS WORK WITH BOOST ON TWO DIFFERENT LS APPLICATIONS. I COMPARED THEM TO A SET OF 317 CATHEDRAL-PORT HEADS ON A CAMMED LS3, NA AND AFTER INSTALLATION OF A PRECISION TURBO. I ALSO SHOWED HOW WELL THEY WORKED ON A DESTROKED (4.8L CRANK) LS3! i EVEN RAN A PAIR OF DIFFERENT CAMS ON THE SHORT-STROKE, TURBO LS COMBO!
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My opinion, which nobody asked, if you have a 4"+ bore and have to buy heads get the ls3s. If smaller than 4" cathedral. If you have some cathedrals just throw them on until you want/need more head.
....Who doesn't want 'more head'...? LMAO !
One day I will have a LS car. Love the channel
great question/advise !!!
Thank you Rich, much appreciated.
great video, very informative!
Other then adding boost is there heads cams,intake,etc that can be added to increase hp/trq with out loosing mpg.
It takes fuel to make power. TANSTAAFL. The only way to make more power w/o burning more fuel is to increase the compression ratio. Run insane compression ratios in an Otto cycle engine, and you start talking things like water injection or alcohol fuels. [I believe it was Ricardo almost a century ago who showed that if you ran pure ethanol, then the detonation limit on CR was in the high 30s:1..?]
Bridge the Gap next to compare “Ported” cathedral port heads to rectangular port heads.
Average HP/TQ throughout the useable RPM range?
There’s really 3 stages of heads with specific applications based on intended use etc.
Was it BTR or Tony at BES who doesn’t recommend Rec heads as SOP until 400+ CID?
trick flow 22 vs rec port video is up-ported cath is better than stock rec port
Richard, what would have happened if you used a trickflow 245 Gen x cathedral port head on the first test against the ls3 head combo?
ported cath heads make more than stock rec ports
@@richardholdener1727 have you done a 6.0 or 6.2 with a 4.8 crank by chance? (Thinking to run rec ports on a displacement limited class)
Definitely worth in NA, not so much Boosted. Imo. Could run a little more boost, and close the gap. Also blowing a motor with some junkyard 317s hurts a lot less financially than messing up ls3 heads.
Good point.
Yep sell the heads and buy beer 🍻.
Gotta pay to play.
Home ported LS3 heads going on my newest setup. Less restriction needs less boost.
boosted motors get .019 gap
@@ZONES89RS that's the thing though, you can make 1,000 hp on any of them. You can run 317s or 706s with 1 extra lb of boost and make up the difference without spending the extra money. Less restriction does take less boost, but cathedrals on 15 and recs on 13 or 14 will still make about the same power. Just depends on power goals. Most people are only running 10-12 lbs making 550-600 whp and would be fine with whatever it came with from the junkyard.
rec port heads FTW
Rec ports wreck shop. Budget guys, stick with your cathedrals and save some cash if you gotta.
The rec port heads "look" like they would just kill the church heads .... but sure did not! The best thing they did was get rid of a pound of pressure up top. I have a camaro with a lt4 I don't think besides studs I am going to touch them....There is Very little/ no testing on those heads.
see BTR
I thought velocity was more of a factor. I’m saying I thought cathedral flower air better than rec
I feel a bit like a sponge, soaking up results from the testing you do and report. Really good info, again! I can’t help but notice there is a difference between your conclusions and those of “Freiburger and the two Steves” when evaluating the effect of better heads under boost. This is not to question your conclusions in any way, they are clearly valid. Their test compared two sets of heads with a Procharger-different in many ways from turbocharging-but they concluded the better heads had very diminishing returns. Why? They did not change the pulley ratio for the mechanically driven setup, and had less gain from the “good” heads because the boost dropped. With your turbo test, the boost was closer to the same showing the true benefit of better (or at least higher flowing) heads in the boosted combo. This does not change your final advice, to just use the heads you have for boost. But when the underlying engine has the capability to use more air, you need to give it that air for a fair evaluation, IMHO. Regardless, thanks for this info Richard!
if it adds power na-it adds power under boost
Freiburger should have given us another run with a boost correction.
We all hear everyone talk about rocker weight, and how stock rockets are best etc.....has anyone ever done independent tests to see if stock rockers are the best high rpm rockers ? Do heavy roller rockers float at higher rpms ? So many designs, so few answers. And of course with boost.
lots of people runing 8500 rpm with stock rockers
@@richardholdener1727 So I hear....but do the aftermarket roller rockers actually reduce that ability due to their weight ?
That's a happy dyno
no
The way Richard run his engines are without accessories or intake boxes. That accounts for about a 25hp gain +/-
that trick flow head did bad on my friends car caddy CTSV he took the stock heads off put the TFS rect heads on and lost 4 tenth in the 1/4 mile there 235 head is the best they just don't have the experts there any more.
I have a dart LS block with LS three cylinder heads that flow 360 at 700 lift trying to make 1500 hp CompCams recommended this cam. What do you think about this cam.I 248 E 256 L688 lob 114???
YOU DON'T NEED THAT MUCH CAM FOR 1500 HP-BUT IT WILL WORK
If I have a 4.8 LR4 Gen IV with 706 heads, could the cathedral ports be reworked into a rectangular port while only requiring an intake manifold swap or would it be more involved in that? Could you also shape the cathedral intake ports to rectangular instead of sourcing another manifold or using adapters?
If what I have theorized will work, it’d allow the combustion chambers to be reworked to match the bore size without being oversized, minimize detonation characteristics and chances of valve interference while having the flow benefits of the rectangle port.
Any input?
REDOING THE CATH HEADS IS NOT THE ANSWER OR THE DESIRED TEST
@@richardholdener1727 why not?
And that is why I am doing a smaller summit 8720 218 227 600 lift and adding boost to it. Hoping for 600 to 650 who with 9 to 12 lbs.
Will the LSR comp 54-469-11 cam bolt into an LS1?
yes-needs springs
Richard, would a pair of Trick Flow Gen X 220 heads be a good fit for my 6.0 408 stroker with 2 VS Racing turbos?
yes
I'm going to use 2 VS Racing 78/72 turbos. Watching your videos has inspired me to do something that I've never done before. Thank you so much and God Bless 👍
twin 78s will make a lot of power
@@richardholdener1727
What do you think about the BTR stage 4 turbo cam?
you don't need that much cam for those turbos, but if it is a race car-with lots of converter and gear-then you can use it
What about the 5.7?
cath
What’s a good cam for an LSX 6.2 with rectangular port LSX heads.78/75 billet turbo going on it.
The exact one he shows in the video?
i would pick a smaller cam-like a BTR Hot Rod
Thanks a lot👍🏿
What makes a good turbo cam for a small block 347 ford
xe274hr or xfi236
@@richardholdener1727 right now I'm using a trick flow specialty stage 3 cam it seems to work okay but like you say all cams are turbo cams
#WRONGCAM
i see just how good the coyote is now this alot of motor for only 800 hp which isnt emisson legal now
First comment 🤟🤟
bewley theory that cathedral ports work better with boost bewley can suck ir