TSP PRC Stage 2.5 Heads or Stock LS6 Heads ? ---What Heads would You recommend for my friend (Mods below)
Stg 2.5 5.3l Heads
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Manley Intake Valves (2.04)
Stock 1.575 Manley Exhaust Valves
PRC Double Spring Kit
Valve Options:
2.02" or 2.04" Intake Valves
1.575 Manley Exhaust Valves (2.5 heads)

Flow---> Intake on a 2.04"
.300 210
.400 252
.500 286
.550 295
.600 306
Or Stock LS6 Heads .He has a Stock 346 ci LS1 with a 125 Nos Dry Shot and is going to select a Cam probably from TSP or LG . Thanks Fellas .

i have the prc 2.5's myself and like them. paid around $1500 for them. what about finding a machine shop to port out the stock ls1 heads. i found one after i bought the heads. he wanted $1200 to be as good as the afr mongoose heads.

Hands down, the PRC stage 2.5s are going to perform much better! The factory LS6 heads flows well out of the box, but it cannot compete with a ported head. FYI, if he is wanting a set of PRC stage 2.5 LS6 heads, we have them for $1,999 outright! These are with brand new GM LS6 head cores.

FYI, we have the PRC stage 2.5 5.3L cylinder heads on special for $1,400 + shipping! We can put together a complete heads/cam package as well. Feel free to give us a call, and we'll get you taken care of.

Trevor
Texas Speed & Performance

I'd go with the ported LS6 heads.

Mike

Awesome ...Thanks for the input fellas.