408ci vs 421ci..??????
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Teching In
Joined: Feb 2011
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408ci vs 421ci..?????? 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
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; Jul 18, 2011 at 11:11 PM.
