502 upgrade, anyone got a good setup?
10-25-2010, 10:34 AM
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502 upgrade, anyone got a good setup?
Thinking about upgrading my 502's 425hp carbed, gm performance based, holly marine carbs (800) and stainless marine exhaust. Im thinking right now I want to get around 575hp, change heads/cam/intake, and want to run on 87 octane. Anyone got a good similar setup they have already done or reccomend a good head/cam/intake combination
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10-26-2010, 08:41 AM
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I don't know if you're running a blower, but could you put a set of rectangle port closed chamber heads from a 69-71 BBC to bump up the compression to gain some more power?
10-26-2010, 09:35 AM
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AFR 265 oval heads, Vic Junior intake, RM Builder cam and valvetrain. Easy 600+hp. An 800cfm carb is just barely big enough for this app and would need a bit of tweaking to optimize. A 950ish works better. I did a pair in a 29 Baja upgraded from 502Mag MPI. It went from 68 before to 86mph after! They made 630hp 605torque. Bob's the man!
Last edited by HaxbySpeed; 10-26-2010 at 09:43 AM.
10-26-2010, 10:01 AM
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You should have the square port heads i believe. Of course their are better choices for heads out there, but if your on a budget yours can work to meet your goal. I highly recommend sending your heads to Jimmy Valayko in grand rapids for a little magic, bob madeira cam, and you'll be a happy guy. Adding a solid 100-125HP per side in your 28 should make you grin.
