upgrading a 509
#1
VIP Member
VIP Member
Thread Starter
upgrading a 509
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
#4
VIP Member
iTrader: (1)
If you aren't already, make sure you use head studs when you put it back together. Also make sure to use Fel-pro MLS or similar head gskts. I have a Crane 731 roller cam for sale (Gen 6). It was on my 509's and with 8 lbs boost made 750 hp.
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#6
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Thread Starter
thanks for the replies.
#7
VIP Member
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Thread Starter
thanks, larry
#8
Registered
Pro Comp aluminum heads are nice for the money.
$700 a pair with guides and seats or edelbrock marine complete are around $1500.
#9
Charter Member # 55
Charter Member
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.