Red01Chevy

maybe im looking i the wrong spot but my heads have the number 241 on the outer corner of the front of the head??? is this wright if so how can i find out my specs?

JZ'sTA

iTrader: (23)

5.7 07-98 LS1 heads.
These are the worse heads thta have been put on a LS1 from GM.
After porting they are about the same as most LS1 heads, but still not as good as the LQ9 (317 casting) LS6 (243 casting) 5.3 Liter (i forget this one) and there is also 4.8 head with the same castings as the 5.3's.

Tally TransAm

iTrader: (17)

241's are the 01-02 heads

they flow better than the 853's do stock for stock

Red01Chevy

so what are they good or bad? what do they cc at? are some stock 5.3 heads better?

jrp

iTrader: (16)

as stated 241 castings are the best flowing 5.7 heads over the 853's and the 806. 706 5.3 heads have smaller intake vavles 1.89 vs 2.00 on the 5.7 heads. CC on the 5.3's is smaller, if you get some 5.3's you'll want them ported and outfitted with bigger vavles to get the most out of them. due to there smaller CC they yeild a 10.8 CR IIRC.

do a search for the CC and head casting thread, it has all the info you need.

Red01Chevy

i have a set of stock 5.3 heads . how do you think that would perform with a mild port polish and stock valves???
i also have a set of stock 6 liter heads . what is my best option without much money?

jrp

iTrader: (16)

i'd take the 6.0l heads assuming there LQ9, mill them to get a smaller CC, and port them and keep the stock vavles.

Red01Chevy

i had thought bout that before but don't you think i'd have p/v clearance problems my cam has .570 lift and i dont want nething less than .1 clearance.

Red01Chevy

how much would i have to mill them to get to a stock LS6 head cc? i think its 64??