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What will you be into your current heads for once rebuilt and what will you be replacing? |
Not sure yet, but savings of buying new castings, I get my work done fairly cheap as it's a friend also.
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I do not know your combo, but 345's are large for normal size(468-509) boat engines, unless I'm off on this opening up the ports a bit more not going to give you much at the RPM's we usually see ?
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I am 548CI, they are still a tad large to me but these engines were also done 20 years ago before all the good heads we have now... opening up ports and making better flow don’t always happen at same time, you can gain flow without hogging them. |
An old thread. You may have seen but thought I'd post anyway. https://www.offshoreonly.com/forums/...ast-heads.html |
Saw that, Didn't see numbers.. ugh
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How old are the heads? The decks on those heads were notorious for caving in on the combustion chambers and getting holes. Had it happen to me two times on my engines many many years ago. If the heads need seats and guides anyway it might not be worth the fuss to fix them and then have them ported. But I guess you'll find out soon enough!
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Pretty sure 1999 era when emgines were redone.. |
They have a 26* valve angle. Most aftermarket performance heads have a 24* valve angle.
https://cimg7.ibsrv.net/gimg/www.off...af74c0814c.jpg Heres some flow numbers from my head guy. All flowed on same bench, same fixture, etc |
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