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Old 02-24-2010, 09:07 PM
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377 C.i. Sbc??

So I just picked up a engine thinking it was a 377. Got it home and started to take it up just to put some new bearing and gaskets in it and to kinda see what all was in it. I noticed it was a GM HD Bowtie block. I have never had one of these or a very well built sbc for that matter. So I looked up the number 366286 that were on the block. I keep finding that the block is a 350 block. I thought the 377 was a 400 block with a 350 crank. Maybe im wrong, but if this is a 350 block I wonder what kind of motor it is. The engine made 534 hp and 447 TQ. Any help would be awesome!

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Old 02-24-2010, 09:21 PM
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Could well be a 377 like you think, that # Bowtie block is listed as being capable of being bored to 4.160". It is a siamese bore performance block that comes at 4.00" bore from GM but can be bored much bigger than a stock block. Listed as 4-bolt main Nodular Iron caps, 2.45"(350) main bearing bore.

All someone had to do is bore it and use the correct pistons and you have the 377 You will have to measure the bore and stroke to know for sure what you actually have.

Nice block, you could go bigger in the future with it- 400-406-415-421
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Old 02-24-2010, 09:28 PM
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A 4.00" bore with a 3.75" stroke is also a 377. It's possible the previous owner installed a 3.75" stroke crank and left the bore at 4.00". Did you measure the stroke yet?
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Old 02-24-2010, 10:23 PM
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And the opposite which is 4.125 bore and 3.480 stroke is a 372, add a .030 overbore and you have 377.
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Old 02-24-2010, 10:27 PM
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it could be either, a block bored to 4.125 as a 400 with a 350 crank or a 4.000 bore with a 3.75 crank, but isn't a standard bore 350 with a 3.75 crank, i may be wrong but isn't that a 376. only way you will know is my tearing it down or tearing the heads off
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Old 02-25-2010, 12:30 AM
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Quote:
Originally Posted by my87Z
it could be either, a block bored to 4.125 as a 400 with a 350 crank or a 4.000 bore with a 3.75 crank, but isn't a standard bore 350 with a 3.75 crank, i may be wrong but isn't that a 376. only way you will know is my tearing it down or tearing the heads off
^^^ LOL 376.992 cubic inches, how much closer does it need to be to count
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Old 02-25-2010, 06:16 AM
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Quote:
Originally Posted by ericnova72
^^^ LOL 376.992 cubic inches, how much closer does it need to be to count

yea you're right
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Old 02-25-2010, 06:25 AM
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Usually, a 377 is gonna be a 400 (4-1/8") bore, 0.030" over w/a 350 (3.48") crank in it. Used to take spacers/spacer bearings to pull it off w/an OEM 400 block (non-Bowtie).

I always wanted to do one, but what the heck- if I gots a 400 block- I'm gonna build at least a 400 w/it.

Good find, though. I hope you got it for a good price- somebody has to be getting the deals- it sure ain't ME! lol

If I had a Bowtie block, I'd be thinking 4" stroke...
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Old 02-25-2010, 11:39 AM
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Quote:
Originally Posted by cobalt327
Usually, a 377 is gonna be a 400 (4-1/8") bore, 0.030" over w/a 350 (3.48") crank in it. Used to take spacers/spacer bearings to pull it off w/an OEM 400 block (non-Bowtie).

I always wanted to do one, but what the heck- if I gots a 400 block- I'm gonna build at least a 400 w/it.

Good find, though. I hope you got it for a good price- somebody has to be getting the deals- it sure ain't ME! lol

If I had a Bowtie block, I'd be thinking 4" stroke...

i have always wanted to build a 421 with the 3.875" stroke so i would be all over that with a bowtie block
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Old 02-25-2010, 08:13 PM
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Thanks for all the info and its a 377. I looked up the rods that are from cower and they sell for $1000!!! The more I dig into this engine the more I think I got a really really really good deal. The engine is also a full roller with a custom grind cam from cower.
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