rebuild 502 a carbu in France
 

Hello from France

hello I registered a few days ago on your forum I have a baja 250 ess of 1989 and I am the owner for more than 20 years. i try to rebuild my engine, i have a big block 502 ci mercruiser a carburetor, block boowtie hiperf pass 4 bolts, i give you the casting block number 100511107, it was realerer at 4.530 inches and the crankshaft was rectifying to 0 , 20, I buy JE pistons. ref 338167 pistons, and segments JE s100s8-4530 / 5, forged eagle forged brand rods for 700 horsepower, I also buy heads of art pro 1 ref 19200032 with admission valves of 2,300 inches and exhaust valves 1,880 inches. These breeches were grinded at 0.40mm, which is 0.01574 inches, because they had a valve accident, I give you all its indications to have advice for the continuation of my reconstruction, purchase of a camshafts, a distribution sets and all that may be suitable for a nice engine I would like to have 600 horses I go back motor full roller thank you in advance for your advice because here in France your boat is not very rependu and for the boat mechanics high performance knows even more complicate thanks again for your reponsent

I'm thinking heads are Dart Pro 1 #19200132
Need the right piston #
Rings are JE s100s8-4530
What Intake Manifold?
What Mercuiser carb?

thank you for your answer, the cylinder heads are quite dart; pistons JE ref pistons (338167) 4,530 bore, strock 4,00 inch rod lengt 6,135 inch; the intake manifold is of mercruiser origin of 502 (ref gm 6269318); for the carbu mercruiser I do not regerder the ref, but I think to buy a carburetor quick fuel 750 cfm thank you to convincor and warship 2k15 for m to answer, yes I'm looking what to put as camshafts

Here's the pistons- https://www.jepistons.com/Catalogs/S...placement.aspx
If the head is in fact the 19200132 , should be at about 9:1 compression
As Warship2k15 says what exhaust you have?
Does you block have provision for cam thrust plate?

https://cimg1.ibsrv.net/gimg/www.off...f96eed4063.jpg

An 850 cfm carb would be much better for your engine and will make more HP.

A good camshaft choice would be a Crane 168741

Don't think you'll see 600hp

I have one with exhaust manifolds and risers of origin mercruiser but I have the exhausts in the rear board with 4in tubes. for the device of the push plate buy a kit retrofit aac roller, roller lifter retrofit, with a plate with needle bearing, 1 cam butom, 1 timing cover cloyes 9-231 at summit, for the fuel a 850cfm ok, l aac crane 168741 Is not it a bit too excessive? . before a rollers rockers arms in aluminum comps cams broke my engine was in flat tapped. for 600hp I would get a reason

Its not excessive. Its almost identical to the Merc 525EFI cam.
The only difference is the 525EFI cam has a 114 Lob sep.