upgrading a 509
#13
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The Canfield cyl head is a great head for the money , about 2500.00 a pair complete with siv dudy valves tit retainers & springs Beware not all complete heads are sold with good marine grade parts . Make sure that your short tail pipes are not causing water injest. or more cam will make things worst.
#14
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Join Date: Feb 2007
Location: Sweden
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Yes, its a roller cam. As far as heads, I'm no expert. I have read the merlins really are not very good w/o some porting work. You get what you pay for. I would probably go with some AFR's. The Edlebrock Marine heads are pretty decent too and a good bang for the buck. The are what merc uses on the 525EFI. A friend made about 800hp with them on a whippled engine.
#15
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http://www.offshoreonly.com/forums/s...ight=edlebrock
Last edited by Griff; 01-03-2008 at 02:29 PM.
#18
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I'm looking for suggestions on upgrading a 509, It's going to need a bore due to minor watermarks in the cyl's, It's running a 256 blower w/superchiller and 6psi boost, 2 750 holley's built by nickerson, 525sc cam, flat tappet w/roller rockers, 502 bowtie heads rec. port, thinking about alum. heads and cam upgrade, but water ingestions seems to be a problem, It was disassembled for a blown head gasket between #5&7.
what is a good alum. head that will perform well but not break the bank, this boat gets run about 10 hours a year.
Thanks
Larry
what is a good alum. head that will perform well but not break the bank, this boat gets run about 10 hours a year.
Thanks
Larry
i would suggest edelbrock or procomp
#19
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ARP makes stud kits for just about everything.
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