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Old 09-23-2022, 10:29 AM   #1
Steeveedee
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Re: Gm crate engine

I'd have to say, I'm curious what is so special about a .040 over 350, as opposed to a stock bore?

I'm liking those stroked 454 seasoned blocks, but I'm only looking for torque and HP up to 4000 RPM; my truck would see very little above that.
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Old 09-23-2022, 10:32 AM   #2
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Re: Gm crate engine

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Originally Posted by Steeveedee View Post
I'd have to say, I'm curious what is so special about a .040 over 350, as opposed to a stock bore?
Cylinder wall thickness, especially on blocks that have core shift.

https://mooregoodink.com/what-is-cor...t-detrimental/
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1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
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Old 09-23-2022, 01:47 PM   #3
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Re: Gm crate engine

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Originally Posted by MikeB View Post
Cylinder wall thickness, especially on blocks that have core shift.

https://mooregoodink.com/what-is-cor...t-detrimental/
I understand doing that for a rebuild, but they're doing it on brand new blocks of their own manufacture.
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Old 09-23-2022, 03:48 PM   #4
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Re: Gm crate engine

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Originally Posted by Steeveedee View Post
I understand doing that for a rebuild, but they're doing it on brand new blocks of their own manufacture.
OK, I see what you mean. Nothing special about .040" over. Usually that means the bores wouldn't clean up at .020" or .030". But maybe their blocks are cast that way with thicker cylinder walls, and advertising a 357 separates them from other builders.

That said, Blueprint sounds like a good company.
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1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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Old 09-23-2022, 04:11 PM   #5
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Re: Gm crate engine

I was impressed with the video, and was heartened to see that one doesn't have to be ASE certified to get the warranty. I "gave up" my certs, if you will, when I graduated uni and went to work as an engineer. I never stopped working on my vehicles, though. I haven't done an engine swap in about 8 years, but it's just like falling off a bicycle, really.
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Old 09-23-2022, 09:20 PM   #6
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Re: Gm crate engine

Subscribed. Lotsa good info here. Someday...
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Old 09-25-2022, 02:13 PM   #7
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Re: Gm crate engine

When I was building my 67 I was able to buy a new never used L31 350 SBC. Been happy with my set but a 383ci would be a dream and really fit the purpose you described. Good luck and post your progress.
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