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Old 04-07-2006, 10:33 PM
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1983 sbc block

i have a 1983 chevy 350 block and i have heard that they have pretty thin cylinder walls. i plan on boring it .030 over and pumping out 450 hp with it. it's a 4-bolt to. this is one of the last block i've got it's taken me 3 years to find a block that mikes out correctly, that is a 4-bolt main.

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Old 04-08-2006, 12:29 AM
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Simple engine test on the front of the block where the engine numbers are that little pad, the engines that have thin walls but you can bore 30 over safely are about 2-3 inches wide the better blocks that do not have thin walls are about 5-6 inches wide either block will handle 450 horse power.
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Old 04-08-2006, 12:35 AM
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sonic testing is the only real way to know

4 bolt blocks are dime a dozen

tons of them especially in the '69-'79 trucks 3970010 and 3970014

good luck
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Old 04-09-2006, 04:37 PM
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Why do need 4 bolt main? I've run the same 350 ci 2 bolt w/ milodon studs through 2 different cars total of 7 years.
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Old 04-09-2006, 10:49 PM
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Wow, 3 years is a long time to find a decent block. 0.030" is not a big deal. Assuming everything is setup correctly, that block will handle 450 hp no problem.
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Old 04-10-2006, 06:17 AM
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Will easily handle it. A misconception a lot of people think is that the 4 bolt means something when a 2 bolt block is just as strong and in some cases stronger. Just got a "511" 400 2-bolt main virgin block for $50 just because it was a 2 bolt. Hope it checks out cause it going to be bored and stroked to 420cid.
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Old 04-10-2006, 08:38 PM
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Let me know how the 420 works out,I've got a similar "509" block I'm wanting to do the same thing to.
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Old 04-11-2006, 05:06 AM
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Should be good I hope. Got rotating assembly from dirt track racer last year that cracked a block (Eagle 4340 crack, Eagle 6" h-beams and Ross -6cc flat tops) for $900. They went with Motown block and 434 cubes. Thank god got understanding wife.
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