Need Great HEAD advice (509) MAG
#11
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1 procomp heads suck..cc them and you willsee,all the chambers are going to be off by at leaste 10 cc's..look into a set of afr's 305 heads,,also sounds like your cam is blowing all the boost out the exhaust..they like stock cams,fogducker ran a stock 385 hp cam on his 454 efi and his boat ran 87 mph,,did 67 before that..
#12
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Join Date: Feb 2010
Location: SLC, UT
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+1 on the 305's with CNC'd chambers, I have them on my NA 524 in a Velocity 280 and I run 90 with 4 adults and full fuel. I did do gasket match and port work myself. I f you check the flow on the fully CNC'd 315's they are better than anything from anyone else. they flow better than other's 350's with better velocity for more low end torque. I've had 9 adults and several coolers with a 30p Bravo prop and still got on plane without tabs.
#14
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#15
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I think I'm about 800-900 ft above sea level on Northern Lake Huron. You need to look at the flow of the AFR 315's and compare them to the others, Chevy High Performance Magazine did a side by side dyno run with all the majors and the smaller AFR's out flowed and out performed all the others. If you don't believe me just talk to Bob Madera he's one of the best and he swears by the AFR 305/315's.
#16
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1 procomp heads suck..cc them and you willsee,all the chambers are going to be off by at leaste 10 cc's..look into a set of afr's 305 heads,,also sounds like your cam is blowing all the boost out the exhaust..they like stock cams,fogducker ran a stock 385 hp cam on his 454 efi and his boat ran 87 mph,,did 67 before that..
#20
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I turn my 509 500hp cam, 5600 @6psi with a M3 thru their ****ty carb box 950 prosystems carb, 80.4 GPS 253 checkmate, no tuning as of yet...building EFI for next year...