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Old 09-04-2012, 03:55 PM   #1
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New motor

Hello to all, I'm just starting out on this forum. I've been gathering information about what to do with my motor. I've recently bought GT -40 (non P) heads with the U/L intakes. Then I read that if I boar the motor .400 over, they would 'slow' it down. Would a 331 be ok with this set up? Or should I leave it stock?
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Old 09-04-2012, 04:11 PM   #2
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That's ridiculous!!! Bore the motor .030 to start with if you can.. But the gt40's will work fine we've had them on .060 motors
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Old 09-04-2012, 04:22 PM   #3
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The block is still bone stock, down to the original exhaust.

I found a 302 block thats been boared, honed and has new freeze plugs for $300 on CL, should I jump on it?
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Old 09-04-2012, 04:44 PM   #4
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That's not a bad price does it have the crank and rods and pistons? Or just the block? If you already have an engine machine work isn't very expensive
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Old 09-04-2012, 06:17 PM   #5
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Ok, so I contacted the guy with the block on CL, he says is just the block, but he had a stock crank if I wanted it. Then he said he wouldn't run a stock crank.
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Old 09-04-2012, 06:39 PM   #6
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If I wasn't on a budget I wouldn't run a stock crank either.. But the crank will out last the block if built right
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Old 09-04-2012, 06:40 PM   #7
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i would wait. it would be an ok buy in a pinch. but i can get a complete running motor for that right now.. just saying.
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Old 09-04-2012, 06:45 PM   #8
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I have seen rebuild kits that come with the correct cranks. I offered $250 for the block, but havent heard back yet.
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Old 09-04-2012, 07:28 PM   #9
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Any bore past .030 you run a serious risk of over heating on a stock type 302 block.
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Old 09-05-2012, 12:31 AM   #10
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Re: New motor

Make sure the block is an H.O. roller block or you will be stuck with extra cost converting it.
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Old 09-05-2012, 06:44 AM   #11
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Very good point trojan, I found a website that tells you the everything about the casting numbers. I'm going to use that to be absolutely sure what kind of block it is.
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Old 09-05-2012, 08:44 AM   #12
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Re: New motor

Quote:
Originally Posted by BLKKNGHT View Post
Very good point trojan, I found a website that tells you the everything about the casting numbers. I'm going to use that to be absolutely sure what kind of block it is.
Good idea.


I know how it is to run across what seems to be a good deal, make the purchase in a hurry and get burned when it doesn't turn out to be what you really wanted.
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Old 09-08-2012, 08:53 PM   #13
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Got the block today, its from a 91, according to the site I seen. $275. Its even been notched for a 347. The 331 idea is in the rearview now.
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Old 09-08-2012, 10:07 PM   #14
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Quote:
Originally Posted by BLKKNGHT
Got the block today, its from a 91, according to the site I seen. $275. Its even been notched for a 347. The 331 idea is in the rearview now.
I would personally opt for the 331 over a 347 if it's going to be a daily driver. Reason being is there is a lot of pressure on one side of the cylinder walls do to the long stroke of the 347. The 331 Hp isn't far under a 347 but it will last longer.
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Old 09-08-2012, 10:13 PM   #15
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Quote:
Originally Posted by 93slowstang

I would personally opt for the 331 over a 347 if it's going to be a daily driver. Reason being is there is a lot of pressure on one side of the cylinder walls do to the long stroke of the 347. The 331 Hp isn't far under a 347 but it will last longer.
advise!
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Old 09-09-2012, 12:57 AM   #16
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Thank you for the reminder! I knew there was a reason for doing the 331 over the 347. I forgot about the longer stroke. Ok then, 331 it is. Plus it will be slightly cheaper to build.
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Old 09-09-2012, 07:18 PM   #17
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Get a on3 turbo kit
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Old 09-09-2012, 08:14 PM   #18
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I wish!!! now I'm trying to figure out what type of pistons I should use. Flat, dome, notched...what would be best?
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