Isky vs. 731 Cam?
#12
20 years ago it was running a cam quite a bit bigger than stock with that exhaust without any issues that I'm aware of. But, when you're in the boat business, everything is for sale if you know what I mean and I don't have that engine or the cam to reference. That engine had water issues one spring, so it came out, was fixed and sitting in the shop. Customer came in, "need an engine that will run with a 502, now!" and well.... buh bye. Dad sold it and the boat has sat shrink-wrapped for 20 years. After college 15 years ago I tried to beg, borrow, buy and steal it, but my father threatened to be buried in it. Took me six years to find a good hull that wasn't restored (wanted to build my own if you know what I mean), then an ex-wife and life got in the way. I started in earnest in Dec of last year and was then given my fathers boat in Jan, so now the one I bought is sitting shrink-wrapped waiting until... who knows.
I've been eyeballing the Seaward and EMI systems and I know Stainless Marine and IMCO also build good stuff, so I'm not sold on anything in particular. I'll measure hatch clearance, but suspect that +6 is do-able.
The following 2 users liked this post by Griff:
articfriends (11-24-2021), endeavour32 (12-28-2021)
#14
Platinum Member
Platinum Member
keep in mind that some of the after market heads ( AFR ) have raised exhaust ports, this will widen the gap you currently have.
#15
#16
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articfriends (11-24-2021)
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I'CE (03-02-2024)
#20
Charter Member #1472
Charter Member
i had a 731 in a 509, 5400 rpm fell flat, put a 741 in and 6000 no problem. cams were installed straight up. had a 420 mega-blower on it also with Bassett headers. 731 had a very mild idle, 741 had a nice choppy idle. And still idle at 800 rpm's just my 2 cents.