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Article: Building 630 HP out of a Merc 502 - Intake Manifold article

28Eliminator

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Are those heads the 088 castings? if so, did you go to a smaller (11/32") valve stem/guide? or retain the stock valve dimensions?

Those are good looking torque numbers.
 

BDMar

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Yes they are 088 heads and we did bush the guides for 11/32 valves. Also the intake valves are now 2.250
 

Tommy Gun Images

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Awesome article Brian! I can attest that Brian doesn't baby these things. I've never been in his boat when all we did was cruise!
 

sirbob

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How different is the new (current) Merc 502 HO and could the same be done on that motor?

BTW - running though cats.

Or is it apples and oranges?

Thx
 
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