We should receive 10 sets of Stage 2.5 5.3l Precision Race Components Cylinder heads this week!! All back orders are now being filled & we have a few sets of heads left for anyone needing a good quality cylinder head & a awesome price!

Each set of heads are completely cnc ported on PRC's Haas HS1 5 axis CNC machine & then assembled with great attention to detail! When comparing cylinder heads take a look at the features & components that go into each brands cylinder heads! PRC uses BRAND NEW GM Cores, name brand Manley Valves, PRC's Gold OR New Platinum Series Race Springs all for a awesome price of $1529 for 2.5s or 1429 for 1.5s! Here's The Specs On The Heads:

 

do you have any flow nubers of the 2.5's

 

flow sheet on the 1.5 and is that with free shipping? or how much to ship too 91354?

 

5.3l Stage 1.5 & Stage 2.5 Intake Port Flow #'s From Last Week:

.300 210
.400 252
.500 286
.550 295
.600 306

The Stage 1.5s feature a stock truck valve & flowed a peak of 226cfm at .600 I'll get the complete exhaust flow #'s for both heads later today!

The shipping usually runs about $40

The next run of heads should be ready to ship by tomorrow

 

Are those flow numbers for the 1.5 or 2.5?

 

1.5 & 2.5s have the same intake port & valve

 

Up Up!!

 

Here's some more pics & specs!

https://ls1tech.com/forums/generation-iii-internal-engine/324443-precision-race-components-head-pics-detailed-specs.html

 

What is the port volume for the intake and exhaust ports?

Thanks,