Q&A / Tech

Mailbag: Making Marine Muscle

Got questions?

We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re looking forward to warmer weather by helping with a marine engine build. Check it out:

G.S. • East Moline, IL

Q: I’m doing a marine engine build this summer and I need your help. The boat is a 1984 Sea Ray Sundancer. The current engine is a Chevy 350 with stock components. I plan on taking the engine .030 inches over to a 355 and rebuilding it with new gaskets and hypereutectic pistons. My question is, what would be the best cam to use for good low-end power and a lopey idle? At full throttle the engine maxes out around 4,200 rpm and it sits at 750 rpm when idling.

A: We’ve got a few options for your wave splitter. To generate rock solid low-end power with a prominent lope, equip your Sundancer with a COMP Cams High Energy cam and lifter kiteither COMP’s CL12-210-2 or CL12-206-2 kit. The second kit produces a little less lope with a comparable powerband. Both kits will also work with your stock cylinder heads, just make sure to double check your valve spring install height.

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