SIR

Never used Stage 3 GTP heads. Fully ported/polished.
cc = 71.7

the springs are dual comp cams pacaloy with a 240 seat pressure. Can be swapped out for a set of cc 918's.

These heads are built for FI or BIG CUBES.

>>The heads were flowed by LPE on a 3.90 bore They should be flowed on a 4.125 bore to get better results (unshroud the valves) b/c of the HUGE 2.10 intake<<<
So I basically had them flowed on the wrong bore. LPE said these heads will flow at least 10+ cfm on the bigger bore that these heads are desinged for.

here is what Tony from AFR said regarding this type of head and the 3.90 bore:
"Tony

PS....Most heads in this group have 2.080 valves and there are a few 2.100 heads in there as well. Flowing these type's of cylinder heads on a small bore will provide less than stellar results and most of the manufacturers and suppliers will tell you staight up that they are more aimed at a 4" bore and larger application. Some of these heads get KILLED on a 3.900 bore, but keep in mind they were never meant to be placed on one."
post#37 https://ls1tech.com/forums/showthrea...3&page=2&pp=20

the heads I have for sale are desinged for a 4.00+ bore size

on a non optimal 3.90

int ext
.400 - 245 199
.450 - 264 204
.500 - 281 209
.550 - 293 212
.600 - 284 215

est numbes give by LPE for flows on a 4.00+

int
.400 255 at least
.450 274 " "
.500 291 " "
.550 303 " "
.600 294 " "

As a compairison here are AFR's #'s as posted by Tony from AFR:

"AirFlow Research #’s
205….145….210….257….290….301….308………205 cc’s...(205 w/ 4.125 #’s)
225….151….221….270….306….315….322………229 cc’s"


$1750 shipped


I can take more pics.

1bad2k2ta

iTrader: (3)

Any numbers for the exhaust side, that is important in s/c application.

Thanks

SIR

opps for got that... posting it up now.

SIR

tttttttttt

SIR

umpaa

SIR

ttt

SIR

SIR

SIR

LostCauseZ06

iTrader: (4)

hey how would these heads do on a 408 stroker i dont know much about heads but i am buying a 408 short block and need some heads..

99SS-T

iTrader: (5)

These are big CC heads. If you put them on a stock engine they would be around 9-1 CR. So if you bought these for your engine you would need to get higher compression pistons if you arent using FI. I wish i had the money ot get these. GL


John

SIR

These are made for a 4.00-4.125 bore engine. That is exactly what these heads are desinged for. This can be confirmed by Ed Potter at LPE.
I am mainly on teh Corvetteforum. If you want to know more PM me.

SIR

somewhat correct. I would NOT put these on a 3.90 bore.

SIR

SIR

SIR

SIR