Big Block Chevy Re-build
#1
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Big Block Chevy Re-build
I am wanting to rebuld my 454's in my 90 scarab super sport. I have some questions. I would like at least 500hp. Doesn't have to be a race boat, just a little faster. Can I get this with no reliability issues? Should I build it to supercharge instead? Which will be the most economical and but also the most reliable?
I was thinking:
decent cam
bore a little over
9.5 or so compression
aftermarket heads
good intake
good carb
Ideas?
I was thinking:
decent cam
bore a little over
9.5 or so compression
aftermarket heads
good intake
good carb
Ideas?
#3
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Stroke the engines to 489 or 496, aftermarket exhaust, roller cam, rework heads, intake, ect.. I have been talking to RMbuilder (Bob) about a cam. He can grind a cam to whatever you are looking for. Good luck!!
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It is a saltwater boat. So am I right in saying as long as I flush the cooling system with clean fresh water after every jaunt in the ocean I am ok? Or will it still be a corrosive nightmare?
Thanks for the help too.
Thanks for the help too.
#6
Charter Member # 55
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If they are 19 year old salt water engines, it is quite possible that they are pretty much destroyed inside already. You would probably be better off to buy some good take out engines if thats the case.
#7
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You just need to see how the blocks look as far as how destroyed they are.
454 is a good engine due to all the options available for it.
Bore it .060 and raise the comp to high 9's. Get some nice heads and a cam from Bob Madero.
He'll get you a good recipie.
You didn't say what kind of exhaust you have though and that is your biggest issue. If it is still stock, forget about it. Best case, you need a tube header of some sort.
Good luck.
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Guess I should have clarified.
Remans, extremely low hours. One manifold cracked leaked into combustion chamber. Seized one engine. I do not have to redo both just am pondering doing so. Everything is completely stock. Keep in mind it is a center console. I am sure the 330's are plenty but 500's would be better.
Remans, extremely low hours. One manifold cracked leaked into combustion chamber. Seized one engine. I do not have to redo both just am pondering doing so. Everything is completely stock. Keep in mind it is a center console. I am sure the 330's are plenty but 500's would be better.
#9
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Guess I should have clarified.
Remans, extremely low hours. One manifold cracked leaked into combustion chamber. Seized one engine. I do not have to redo both just am pondering doing so. Everything is completely stock. Keep in mind it is a center console. I am sure the 330's are plenty but 500's would be better.
Remans, extremely low hours. One manifold cracked leaked into combustion chamber. Seized one engine. I do not have to redo both just am pondering doing so. Everything is completely stock. Keep in mind it is a center console. I am sure the 330's are plenty but 500's would be better.
Without an exhaust upgrade, I would order a set of Merlin oval port heads set up and ready to go for that flat tappet cam and upgrade the intake and carb. You will notice a difference, and when you decide to spend the coin for the exhaust, then you upgrade the bottom end.
The money that you all ready spent on the top end, will bolt right onto the new bottom end. By that time you can polish up the runers on those ovals and get a good cam cut and up the comp etc, and you will be where yo uwant to be.
Can't do anything realistic without the exhaust though.
Good luck
#10
Charter Member # 55
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Stock 330's should stay stock. For any decent upgrades with a noticeable hp increase, you'd end up replacing most of whats in them. Better off to sell them and start with engines more suited to hp upgrades.