Offshoreonly.com - Cracked 502 block

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- - Cracked 502 block (https://www.offshoreonly.com/forums/general-q/360998-cracked-502-block.html)

Camalot

06-06-2019 04:56 PM

A mark iv crank will work in a gen 6 block but you will have to convert to a two piece rear seal, mark 4 cam will not fit/work in a Gen 6 pistons and rods are all interchangeable as well as the heads. Flat lifters will work but don,t make much sense to use them when it's made for rollers. Oil pans are not interchangeable along with the timing chain and sprockets.

mike tkach

06-06-2019 11:30 PM

Quote:

Originally Posted by Camalot (Post 4690500)

A mark v crank will work in a gen 6 block but you will have to convert to a two piece rear seal, mark 4 cam will not fit/work in a Gen 6 pistons and rods are all interchangeable as well as the heads. Flat lifters will work but don,t make much sense to use them when it's made for rollers. Oil pans are not interchangeable along with the timing chain and sprockets.

there is no such thing as a mark v block,their is mark iv,gen 5 and gen 6.both gen 5 and gen 6 use a one piece rear main seal.gen 6 is the only one that comes with a step nose cam but all big blocks can be used with a step nose cam.the cam from the gen 5 can be used in a gen 6 block.the gen 5 heads will work on the gen 6 block.

Camalot

06-07-2019 04:24 AM

Quote:

Originally Posted by mike tkach (Post 4690553)

Thanks for picking up on the typo I've now corrected it to IV and not V

propilot

06-11-2019 02:31 AM

Thanks to every one, I am now looking at dart and world product blocks. for more strength for about the same price. I will let you know what I come up with,

mike tkach

06-11-2019 08:11 AM

imo the dart block is the best.

F-2 Speedy

06-11-2019 08:20 AM

Quote:

Originally Posted by mike tkach (Post 4691284)

imo the dart block is the best.

agree, and make sure you check the lifter bores...........:D

larose481

06-12-2019 10:08 PM

Also don't overlook the Brodix iron blocks.

propilot

06-13-2019 03:00 PM

Quote:

Originally Posted by F-2 Speedy (Post 4691290)

agree, and make sure you check the lifter bores...........:D

so what do I need to look at the lifter bores?

ph1971

06-13-2019 04:38 PM

You will need to check and double check every machined surface no matter what block you choose. You need a good machine shop and some accurate measuring tools to end up with anything worth your time. I also prefer the Dart big M

mike tkach

06-14-2019 12:03 AM

Quote:

Originally Posted by propilot (Post 4691704)

so what do I need to look at the lifter bores?

dart leaves the lifter bores a little small so the builder can size them to their lifter of choice.dart puts this information in the paperwork that comes with every big m block.

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