Thread: New 409 Sbc Chassis Dyno

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If you want to move the numbers up---retard the cam setting to straight up and see where it goes--might want to check for ex valve clearance at 10* btdc

Originally Posted by jerry clayton

If you want to move the numbers up---retard the cam setting to straight up and see where it goes--might want to check for ex valve clearance at 10* btdc

NOW im confused.....For years i always advance as much as possible for max top end hp even my three dyno pulls shows the same when i retanded from 35 to 31 i lost 4 hp then up to 36 i gained 6,the hole time peak hp was around 5300 rpm's.