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Author Topic:   which 350 block ?
nate 11
Dirt Full Roller

Total posts: 52
posted November 04, 2002 05:32 PM
i have a 3970014 70-76 block and 1409368 87-95 block both 2 bolt mains. which would be the best to rebuild? it will basiclly stock.305 heads, headers, 450 lift cam, stock intake qaud. jet 4bbl. both need same amount machine work. thanks nate 11

Dirt Full Roller

Total posts: 62
posted November 04, 2002 06:26 PM
It all depends on what style of crank shaft you have, or plan on running the 70-76 block is a 2peice rear main seal, and the other is a one piece. As far as which one is better... i cant really tell the difference, we have one motor that is a 2piece seal, and we also have a 1 piece seal, and have had good luck with both in a modifed. that my two cents

Dirt Freak

Total posts: 346
posted November 05, 2002 12:24 PM
I think you will find a better selection of cranks and flywheeels available for the earlier block.

Dirt Maniac

Total posts: 135
posted November 05, 2002 06:00 PM
Here's the way I look for blocks: Earlier is better, the ones with the large pad on the front rh deck. Then look for the nickel and tin content, 010 and/or 020 cast at various places, but I look in the timing chain area. Now look for well centered cam bearing bosses and lifter bosses. My absolute favorite oem blocks have 010, 020, 512, 509, and 532 all cast in the timing chain area. Grumpy Jenkins liked these also. I am fortunate in that one of the largest core suppliers in the country, Grant Iron, is located here, and I can look through hundreds of blocks if I want. Their place is an engine builder's heaven, but I am straying. If neither block is anything special by the above data, go with the most well centered one.

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