Eng.LSX

Hello ,

I'm new to this amazing forum and I need your experience about the best heads for the LS1 . I searched about this discussion and couldn't find anything , I don't know why there's not much feed backs for the PRC 215 ? I don't know the reason but it seems people like me are waiting to see how this heads would perform .

While comparing the PRC to other heads , I found that TEA stage 2 have almost the same flow numbers , maybe I would be wrong but to me flow numbers are the main factor to decide which heads is better and maybe other parameters like (intake size runner, valves, etc) .

Here's the data for both heads :

1- PRC 215cc :

-215cc intake runner
-84cc exhaust runner
-2.04" Intake / 1.600" Stainless Valves

flow data :

Lift Intake Flow Exhaust Flow
.100" 68 cfm 56 cfm
.200" 145 cfm 115 cfm
.300" 214 cfm 167 cfm
.400" 271 cfm 202 cfm
.500" 304 cfm 219 cfm
.600" 318 cfm 238 cfm
.650" 321 cfm 236 cfm


2- TEA LS6 Stage 2:

-225cc intake runner
- exhaust runner , not mentioned .
-2.040"intake valves and 1.575" exhaust valves

Flow data:

Intake Exhaust
0.100 67 54
0.200 139 120
0.300 219 179
0.400 271 224
0.500 308 248
0.550 315 255
0.600 320 260

I can see the real difference in exhaust flow .

So what do think guys , which's better ?

Note : the price is negligible

Thanx.

luisdm

iTrader: (13)

This reminded me of this article on hotrod magazine, take a look at it as they test alot of heads.
http://www.hotrod.com/techarticles/e...sport_ls1.html

94dragbird

iTrader: (6)

The difference in exhaust flow is because one was flowed with an exhaust pipe and the other was not.

TXZ28LS1

iTrader: (5)

I also like to hear from others as well. That link was very informative. As much as people are quick to jump on those aftermarket castings, those TEA were giving up like less than 5-6 hp to those aftermarket heads.

Darkman

iTrader: (2)

Which method produces a higher flow number?

RJB01camaross

with a pipe

Darkman

iTrader: (2)

Why is that?

need4fun2469

probably helped with scavenging?

Darkman

iTrader: (2)

On a flow bench?

speedtigger

iTrader: (16)

LOL.

Probably has more to do with turbulence.

mike c.

iTrader: (1)

The hotrod .com test looks like this to me. Maybe this head just performed better with the cam and intake they used over that head causing more power and tq. Not showing that maybe this head or that head needs a better matched cam to really shine. My ported l92 heads out flowed my trickflow 235 heads according to flow data. But,my trick flow heads gained more hp and tq under the curve and the same peak hp. My car simply went faster and the mph was higher at the track.

Cold Zero

iTrader: (1)

You cannot compare aftermarket cast to GM cast !

Darkman

iTrader: (2)

Okay I'll bite, why not?

mike c.

iTrader: (1)

I agree gm to aftermarket should not be in the same test. My trick flow has a thicker deck and the valve angle is different to let in more air,ect.

speedtigger

iTrader: (16)

I am curious to hear this explanation too.

TXZ28LS1

iTrader: (5)

I want to see more of these PRC 215 heads. Not too many results as they are brand new and they dont require aftermarket rockers like TFS does.

Darkman

iTrader: (2)

If you have your head assembler, such as Total Engine Airflow, install powdered metal valve guides (instead of bronze) you can get around the need for roller rockers on Trick Flows.

Eng.LSX

Yeah this was one of the best test article hotrod did , sure they tested the TEA stage 2 but I think the competitors was from different level .

THX


Are you sure ?

I think the pipe would restrict the flow but maybe you’re right .

Eng.LSX

Good point , so what do you think the reason behind this ?

Eng.LSX

I knew someone would mention that but why not ?

They almost have the same flow .