Can't decide between ported L92s vs PRCs 237!
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 184
Likes: 2
Can't decide between ported L92s vs PRCs 237! My intention is to awake my stock LS2 a little bit, the plan is having a custom grind cam and a pair of good flowing heads with a LS3 intake, I'll be getting everything from Texas Speed so I was looking at their L92 CNC'ed heads which are a steal for $1300, but then I'm having a fear that I'm putting too much ponies on the table!, so shall bite the bullitt and get a pair of PRCs 237 instead for $1100 more? is it really worth it for a stock stroke engine?, I'm asking that because I've noticed that they have a VERY similar flow numbers (based on whats mentioned in TSP pages).
PRCs :
https://www.texas-speed.com/p-1171-p...der-heads.aspx
L92s :
https://www.texas-speed.com/p-1179-p...ted-heads.aspx
PRCs :
https://www.texas-speed.com/p-1171-p...der-heads.aspx
L92s :
https://www.texas-speed.com/p-1179-p...ted-heads.aspx
Our PRC 237cc heads made over 30 more hp on our engine dyno vs our ported LS3 heads. That being said, you would gain more running the PRC 227cc heads as the 237's and the LS3 heads will actually drop compression due to their larger chamber volume. The 227cc heads start out at 62cc and you can mill from there. You'll gain more from the bump in compression vs the extra airflow of the 237's.
Lonnie
Lonnie
__________________
NOW OFFERING TSP BY YANK CONVERTERS
COMP - FAST - PACESETTER - WISECO PISTONS - LUNATI - CALLIES - NEW TSP BRAND CRANK & RODS - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - ARH HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - PRECISION INDUSTRIES - YANK - CIRCLE D - AND MORE!
COMP - FAST - PACESETTER - WISECO PISTONS - LUNATI - CALLIES - NEW TSP BRAND CRANK & RODS - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - ARH HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - PRECISION INDUSTRIES - YANK - CIRCLE D - AND MORE!
NEW NUMBER (512)863-0900
With the valve size of the 227 we can run up to our Magic Stick 4 camshaft (239/242) without flycutting. The 237 would kill some clearance due to the larger valve, unless he plans to build a larger motor the 227 would be favorable for sure.
Thanks
John J
Thanks
John J
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Teching In
iTrader: (1)
Joined: Aug 2012
Posts: 23
Likes: 0
From: Some where between Orlando and Miami, FL
Lonnie/John,
Would this same assesment be true for the PRC 237's vs ported 823's on a 13:1 416? Also how would it perform with the 237's at a 64cc combustion chamber size?
Would this same assesment be true for the PRC 237's vs ported 823's on a 13:1 416? Also how would it perform with the 237's at a 64cc combustion chamber size?
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 184
Likes: 2
So what you are saying is having PRC 227s with stock LS2 intake is a better choice than going with PRC 237s with a LS3 intake?. Actually, the reason I want to go for a square port heads is because I already have a spare LS3 intake and I thought it would be a good idea to use it in my build.
What if I milled the LS3 heads to match the 10.9 CR?
What if I milled the LS3 heads to match the 10.9 CR?
Trending Topics
So what you are saying is having PRC 227s with stock LS2 intake is a better choice than going with PRC 237s with a LS3 intake?. Actually, the reason I want to go for a square port heads is because I already have a spare LS3 intake and I thought it would be a good idea to use it in my build.
What if I milled the LS3 heads to match the 10.9 CR?
What if I milled the LS3 heads to match the 10.9 CR?
And any time you can have similar flow through a smaller runner, that's a no brainer
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Teching In
iTrader: (1)
Joined: Aug 2012
Posts: 23
Likes: 0
From: Some where between Orlando and Miami, FL
So what you are saying is having PRC 227s with stock LS2 intake is a better choice than going with PRC 237s with a LS3 intake?. Actually, the reason I want to go for a square port heads is because I already have a spare LS3 intake and I thought it would be a good idea to use it in my build.
What if I milled the LS3 heads to match the 10.9 CR?
What if I milled the LS3 heads to match the 10.9 CR?
Last edited by JayTS; Oct 28, 2016 at 05:35 AM.
JayTS definitely has it right here. 227 and 237 are cathedral. The 237 was really designed for larger cube strokers like 402's and 408 motors. That runner size, valve size, and combustion chamber don't promote the low end power people would expect from a stock bottom end motor.
The LS3 heads have the same effect as the 237s would due to size. If you were to mill them down to gain the compression back you would kill a lot of piston to valve clearanc e preventing running a large camshaft.
JayTS, to answer your question I feel like its hard to compare because at that point the intake manifold becomes a serious question. If you put a good sheet metal manifold on top of the LS3 heads and try to rev it high I would expect a larger peak number due to more flow. With most street intakes I would lean towards the 237 because LS3 street intakes are bad, whether you talk about FAST or stock.
For that setup I would almost want to look at the 247 head we have. At that kind of compression, and assuming a good intake is on there the 247 would do better. We have a 14.5:1 416 solid roller motor with 247s and a ET 2 piece intake in one of our race cars right now, last engine dyno was 760+ so cathedral will definitely perform.
The LS3 heads have the same effect as the 237s would due to size. If you were to mill them down to gain the compression back you would kill a lot of piston to valve clearanc e preventing running a large camshaft.
JayTS, to answer your question I feel like its hard to compare because at that point the intake manifold becomes a serious question. If you put a good sheet metal manifold on top of the LS3 heads and try to rev it high I would expect a larger peak number due to more flow. With most street intakes I would lean towards the 237 because LS3 street intakes are bad, whether you talk about FAST or stock.
For that setup I would almost want to look at the 247 head we have. At that kind of compression, and assuming a good intake is on there the 247 would do better. We have a 14.5:1 416 solid roller motor with 247s and a ET 2 piece intake in one of our race cars right now, last engine dyno was 760+ so cathedral will definitely perform.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Thread Starter
On The Tree
Joined: Feb 2013
Posts: 184
Likes: 2
I totally got the idea now 
So to wrap it up, here is my plan :
PRC 227 heads
Fast 102 intake
Camshaft : 223/229 - .629/.629 @ 115+4
1-7/8 LT headers with no cats.
T56 M6 with 3.42 rears
I'm now ready to pull the trigger on this deal!
Texas Speed : Expect my call on next Monday morning.
So to wrap it up, here is my plan :
PRC 227 heads
Fast 102 intake
Camshaft : 223/229 - .629/.629 @ 115+4
1-7/8 LT headers with no cats.
T56 M6 with 3.42 rears
I'm now ready to pull the trigger on this deal!
Texas Speed : Expect my call on next Monday morning.
Teching In
iTrader: (1)
Joined: Aug 2012
Posts: 23
Likes: 0
From: Some where between Orlando and Miami, FL
Thanks for the quick and thorough reply,
To add on to my setup, it will be in a lightweight RX7 and intake manifold was limited at best being a Tony Mamo ported FAST 102/NW 102 to compliment the 64cc PRC 237's, Johnson 2116 Limited travel lifters, and a custom hydraulic roller BTR cam (243/262) and of course being a 417ci shortblock. If I was going to change I would go with the PRC small bore LS7 heads and a LLSR cam setup. Wish I would have gone with the 247's but I got a deal on the 237's. Thanks again!
To add on to my setup, it will be in a lightweight RX7 and intake manifold was limited at best being a Tony Mamo ported FAST 102/NW 102 to compliment the 64cc PRC 237's, Johnson 2116 Limited travel lifters, and a custom hydraulic roller BTR cam (243/262) and of course being a 417ci shortblock. If I was going to change I would go with the PRC small bore LS7 heads and a LLSR cam setup. Wish I would have gone with the 247's but I got a deal on the 237's. Thanks again!
JayTS, to answer your question I feel like its hard to compare because at that point the intake manifold becomes a serious question. If you put a good sheet metal manifold on top of the LS3 heads and try to rev it high I would expect a larger peak number due to more flow. With most street intakes I would lean towards the 237 because LS3 street intakes are bad, whether you talk about FAST or stock.
For that setup I would almost want to look at the 247 head we have. At that kind of compression, and assuming a good intake is on there the 247 would do better. We have a 14.5:1 416 solid roller motor with 247s and a ET 2 piece intake in one of our race cars right now, last engine dyno was 760+ so cathedral will definitely perform.
For that setup I would almost want to look at the 247 head we have. At that kind of compression, and assuming a good intake is on there the 247 would do better. We have a 14.5:1 416 solid roller motor with 247s and a ET 2 piece intake in one of our race cars right now, last engine dyno was 760+ so cathedral will definitely perform.
Last edited by JayTS; Oct 28, 2016 at 07:49 PM.