Thread: help with slow 496!!

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i do not think you have 345 heads they have a 2.250 or 2.300 intake valves . the heads under the valve cover are mark for runner size and stamp on the side of the head as well .did you O deck the block? i think your cam s to big for your ch you did not say what stall you have ? a heavy car would need some stall and gear with this cam and cr to get out of it way .you could go to a 112 lsa like 621/621 .. 246/254 @050 on much smaller cam but should work better i have had the same build up with more CR and some other things i do .that car was a3800+ car running 11.00