Question on comparing these 2 heads
Thread Starter
On The Tree
Joined: Jul 2017
Posts: 102
Likes: 0
From: Cuba, MO
Question on comparing these 2 heads still trying to figure a few things out on upgrades.
the car has a stock lower end LS1
im trying to figure out the best bang for my bucks since these 2 heads are really close in Flow numbers so im having a hard time trying to decide which one to go with...and honestly why go with one over the other.
plan for the car is a driver from time to time and Drag car. but will see more driving time than the track.
I do plan to do Cam which I am unsure on yet. that's next to figure out.
intake I plan to use a Fast 92 and Fast 92 TB.
also I plan to run a 150 shot max on the car also when at the track
Here are the 2 heads im trying to compare. can you all lend a little thought one which one would work better than the other and why. that would be a huge help.
PRC As-Cast 225cc LS1/LS2 Cathedral Heads..62cc...price $1799.99
this includes TSP .660 Dual spring kit with Titanium Retainers. hollow stem valves would be another $50...are the hollow stems worth the $50?
Flow Data (4.00" Flow Plate - No Exhaust Pipe):
PRC Stage 2.5 LS6 CNC Ported Heads...62cc....price $1649.99
also with the same TSP .660 Dual Spring kit and titanium retainers.
Flow Data: 3.910" Flow Plate - No Exhaust Pipe
Lift Intake Flow Exhaust Flow .200" 147 cfm 114 cfm .300" 209 cfm 152 cfm .400" 258 cfm 191 cfm .500" 294 cfm 207 cfm .600" 316 cfm 226 cfm any help or opinions would be a huge help in understanding one over the other and which would be best for my application.
the car has a stock lower end LS1
im trying to figure out the best bang for my bucks since these 2 heads are really close in Flow numbers so im having a hard time trying to decide which one to go with...and honestly why go with one over the other.
plan for the car is a driver from time to time and Drag car. but will see more driving time than the track.
I do plan to do Cam which I am unsure on yet. that's next to figure out.
intake I plan to use a Fast 92 and Fast 92 TB.
also I plan to run a 150 shot max on the car also when at the track
Here are the 2 heads im trying to compare. can you all lend a little thought one which one would work better than the other and why. that would be a huge help.
PRC As-Cast 225cc LS1/LS2 Cathedral Heads..62cc...price $1799.99
this includes TSP .660 Dual spring kit with Titanium Retainers. hollow stem valves would be another $50...are the hollow stems worth the $50?
Flow Data (4.00" Flow Plate - No Exhaust Pipe):
LIFT
INTAKE FLOW
EXHAUST FLOW
.100"
68 CFM
56 CFM
.200"
145 CFM
113 CFM
.300"
210 CFM
164 CFM
.400"
257 CFM
200 CFM
.500"
300 CFM
214 CFM
.600"
318 CFM
229 CFM
.650"
321 CFM
230 CFM
INTAKE FLOW
EXHAUST FLOW
.100"
68 CFM
56 CFM
.200"
145 CFM
113 CFM
.300"
210 CFM
164 CFM
.400"
257 CFM
200 CFM
.500"
300 CFM
214 CFM
.600"
318 CFM
229 CFM
.650"
321 CFM
230 CFM
PRC Stage 2.5 LS6 CNC Ported Heads...62cc....price $1649.99
also with the same TSP .660 Dual Spring kit and titanium retainers.
Flow Data: 3.910" Flow Plate - No Exhaust Pipe
Lift Intake Flow Exhaust Flow .200" 147 cfm 114 cfm .300" 209 cfm 152 cfm .400" 258 cfm 191 cfm .500" 294 cfm 207 cfm .600" 316 cfm 226 cfm any help or opinions would be a huge help in understanding one over the other and which would be best for my application.
Thread Starter
On The Tree
Joined: Jul 2017
Posts: 102
Likes: 0
From: Cuba, MO
sorry fellas...thought that would come out in the post better than that.
also something else that I also was concedering was trying to find a set of 243 heads and just having Texas speed do the stage 2.5 port job and add the TSP spring kit that would put that price at $1199.99
also something else that I also was concedering was trying to find a set of 243 heads and just having Texas speed do the stage 2.5 port job and add the TSP spring kit that would put that price at $1199.99
Trending Topics
I'd go PRC as cast 225s.....and the Hollow valves for that valve train stability when on the NOS
Also the thicker deck surface would help head gasket sealing as your cylinder pressures will be skyrocketing on the NOS
They have the slightly altered valve angle to give near stock PTV clearance even though they're 2.06 diameter intakes
I would have to pull them apart and do some creative cartridge roll blending but that's just me....Get the powdered metal guides and plan for a stock rocker bushed trunion upgrade as well....TSP makes some nice cam grinds too....people over there are great to deal with
Also the thicker deck surface would help head gasket sealing as your cylinder pressures will be skyrocketing on the NOS
They have the slightly altered valve angle to give near stock PTV clearance even though they're 2.06 diameter intakes
I would have to pull them apart and do some creative cartridge roll blending but that's just me....Get the powdered metal guides and plan for a stock rocker bushed trunion upgrade as well....TSP makes some nice cam grinds too....people over there are great to deal with
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
For only $150 difference I would for sure go with the Trick Flow. There is more benefits than just the flow as mentioned above. The main one I was going to mention was the valve angle. The thicker deck surface is a big plus too that AR shale mentioned.
If you use stock rockers on the Trick Flow heads you'll need to grind of the small tabs on the bottom of the rocker stand.
And like AR shale mentioned use stock trunions or go with bushing trunions. The aftermarket roller trunions are having wear issues.
If you use stock rockers on the Trick Flow heads you'll need to grind of the small tabs on the bottom of the rocker stand.
And like AR shale mentioned use stock trunions or go with bushing trunions. The aftermarket roller trunions are having wear issues.
Keep in mind that bow benches can be like dynos, also the data on the TSP's are on a smaller bore.
you could also keep an eye on the classifieds to save a bit, also consider the other major porting companies (AI, TEA...). I ended up scoring a set of fresh rebuilt AI 232cc heads with 62cc chambers, valves, springs, and retainers for $1200 shipped.
you could also keep an eye on the classifieds to save a bit, also consider the other major porting companies (AI, TEA...). I ended up scoring a set of fresh rebuilt AI 232cc heads with 62cc chambers, valves, springs, and retainers for $1200 shipped.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
If you look at flow #'s of Stage I vs. Stage 2.5, you will see that there is very little difference between them. Like you said, I would think that on a 5.3 there would be even more shrouding with the larger valves, making the Stage I an obvious choice for many of the smaller bore engines.
On The Tree
Joined: Sep 2015
Posts: 153
Likes: 0
From: Tucson AZ
The prc heads are gonna out perform the 243s. Is there a budget or a goal as far as e.t/mph? I have stage 2.5 243s and there badass but I would have loved to get the prc heads after doing the math.
LS1Tech Sponsor
Joined: Feb 2008
Posts: 300
Likes: 18
Another positive aspect of the 220 is the ability to put them on a bigger bore down the road to de-shroud the valve. A bigger valve in smaller bore still benefits because 80% of it nowhere near the cylinder.
__________________