408ci vs 421ci..??????
#1
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Hey guys my ls6 motor finally came to the last straw of its hard beat on life lol.. Now its time to upgrade.. I would like to keep my Fast 92/92 and 799 heads, how big ci should i go, 408 or 421ci both of these 2 motor are the same price almost. Where do u guys recomend i buy my next short block from also. I do live only 100miles from Texas Speed Performance, any of you guys bot any short blocks from them.. Any good or bad experiences please let me know.
Thanks
Thanks
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#5
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You put those heads on a 421ci and they will knock it down to a 383ci. 799's will choke the hell out of that engine. L92 heads are cheap and flow awesome.
My friends 422ci with a Fast 90/90 made 535 RWHP...can't tremember what heads though. With a cam that was in the mid 230's duration too. So you can make plenty of power.
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My friends 422ci with a Fast 90/90 made 535 RWHP...can't tremember what heads though. With a cam that was in the mid 230's duration too. So you can make plenty of power.
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Last edited by LS6427; 07-18-2011 at 11:11 PM.