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need suggestions from a BBC

Old 03-14-2014, 08:24 AM
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my BBC 502mpi 1996 needs to be reborn. comprtion test revealed that only one cylinder has got some power left.
i like to go 540 with carb instand of efi.

what products you recomened to do so because i saw alot of different makers out there.
alos like to get 650hp out of it.
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Old 03-14-2014, 10:19 AM
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540 cui would mean you are starting with a new block a 502 block will not push out to 540. I build up a pair of 540s last year for my boat got 635hp at 5700rpms. I used merlin blocks dart iron eagle heads callies cranks and rods with JE pistions. there is more then one way to skin a cat, do your home work use a good marine engine shop to help you with your mechine work.
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Old 03-14-2014, 10:27 AM
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What ? 502 blocks will go 540. .030 over bore and 4.25" crank.

Many have gone 4.375" stroke and 557" cid.
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Old 03-14-2014, 10:31 AM
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Originally Posted by SB
What ? 502 blocks will go 540. .030 over bore and 4.25" crank.

Many have gone 4.375" stroke and 557" cid.
Mine are .060 over . 4.530 Bore.
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Old 03-14-2014, 10:34 AM
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Stock bore on a 502 is 4.470.
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Old 03-14-2014, 11:02 AM
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Call Bob Madera, discuss what you want and your goals and he can provide everything you need with a good solid package.
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Old 03-14-2014, 01:02 PM
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Originally Posted by slickwilly382
540 cui would mean you are starting with a new block a 502 block will not push out to 540. I build up a pair of 540s last year for my boat got 635hp at 5700rpms. I used merlin blocks dart iron eagle heads callies cranks and rods with JE pistions. there is more then one way to skin a cat, do your home work use a good marine engine shop to help you with your mechine work.
I need a block to do the 540? I cannot do it on stock 502 ?
Also where can I see the dart iron eagle heads ?
Carb and inlet what did you use?
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Old 03-14-2014, 01:29 PM
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I have this 540ci / 632 hp engine with dyno time only. Flagship Marine build with GM block (short-deck), GM 088 heads, Eagle crank/rods, JE pistons, GM HEI ignition, ASM EFI (take it off if you want), Eikert manifolds. Also now has flat o-ring style valve covers. $12k or let's talk. Will rig it up for a static test demo if you're serious.
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Old 03-14-2014, 02:40 PM
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You DO NOT need New Block. Like SB said .030 over 4.50 bore and 4.25 crank and you have 540"
I bought almost everything I needed for my builds from CNC Motorsports in SD. Crane cams, lifters, springs, rockers, SRP pistons etc etc etc. Great service and prices. I went .060 over on the bore kept the stock 4.00 stroke for 515"
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Old 03-14-2014, 02:41 PM
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Like others said, definitly dont need a new block on a 540 based on a standard 9.8 deck.
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