need suggestions from a BBC
 

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.

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.

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.

Stock bore on a 502 is 4.470.

Call Bob Madera, discuss what you want and your goals and he can provide everything you need with a good solid package.

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?

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.

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"

Like others said, definitly dont need a new block on a 540 based on a standard 9.8 deck.

What he posted is not correct info.

You can absolutely use your block. It just needs a new rotating assembly with a 4.25 stroke crank and bored .030 over.

That package C_Spray posted looks like a heck of a deal.

agreed!!

yep.

Thanks, C but i want to bulid my motor. Relly nice and worth it what you have there!
Any suggestions on the rotating asembly ?
Read that the eagle crank is not the top of the list .
And some use mahle pistons with wiseco rings why?
What about Lunati kit?

I believe je or srp still offers the hp 500 clone pistons for the 502 stroker ,bout a thousand bux right there

Lunati crank ?

Callies is my choice on the crank. I like there ultra rods too. That's what's going in my new motor.

Just a heads up I spend a few evenings a week in a machine shop that does alot of custom motors. The Eagle stuff usually needs work main and rod journals all over the place. Scat is much better on machining. My last motor I used a scat rotating assembly that cam balanced $300 worth of heavy metal later it was balanced. Lunati, Callies, Crower all excellent products never any failures and great tolerances. Mahle makes a nice piston but they are a little more money. Je and Srp also great choices for pistons Srp's little less money and will work perfectly fine I would use Molly rings in your build if its going to be NA stay away from gapless rings. Most builders have preferences on parts and the way things are today it usually boiles down to who has the better deals... Hope this post helps you out and good luck with your build one last thing. Get yourself a good oil pan.

Exactly what I have found^^^ good post!

As said before you can use your block. I did a 502 into a 548. I went with a Eagle crank and rods (H beam) becasue of price but I think it did need some machining. With JE pistons. The combination did 629Hp on the Dyno and as has been holding together for 4 season running it hard here and there too, probably around 50 hrs a year.