Identify That Engine Block

[338Shooter]

http://www.gmhorsepower.com/HT-383.php

They make a 383 crate motor. It is bored over and clearanced for 3.800" stroke. This one is bored to 4.030 and it is clearanced. This casting number was used in a 350 crate motor, but that doesn't mean they machined all of the castings as 350s.

A 383 stroker is most commonly found with a 350 bore + .030" and 350 main journals. You don't have to have a 400 crank to make a 383.

Here is 1 piece rear seal 383 block new from GM. http://www.gmperformancemotor.com/M...16&cvsfa=2547&cvsfe=2&cvsfhu=3838393632353136

 

[Biggsly]

http://www.classictruckshop.com/castgm_smblock.php

 

[redmax51]

http://www.gmhorsepower.com/HT-383.php



A 383 stroker is most commonly found with a 350 bore + .030" and 350 main journals. You don't have to have a 400 crank to make a 383.

Wrong,350 + .060= 358 ci.You have to have the stroke to get 383.BTW,400 crank+350 rods+.060 over bore is 388.383 is achieved with std. 4" bore and 400 crank.Called a small block racer buddy for clarification.

 

[justinsaneok]

Chevy does not make a 383 block, I have a book somewhere that I can look up the number and find out what it is, if I find it I will let you know

383 is a 350 block bored .60 over the stock bore not a 400 block a 400 ci engines crank is used and the longer stoke and bigger bore makes it 383 ci engine with out the crank from a 400 or a stroker crank it would just be a 350 with the over bore it would be like 355 or something close to that

 

[338Shooter]

Wrong,350 + .060= 358 ci.You have to have the stroke to get 383.BTW,400 crank+350 rods+.060 over bore is 388.383 is achieved with std. 4" bore and 400 crank.Called a small block racer buddy for clarification.

Ha, you can have 350 main journals with a 3.750 stoke....

383 is a 4.03 bore and a 3.75 stroke.

3.14*2.015^2*3.750*8 = 383.6668ci

A 400 crank and a 350 crank doesn't tell you the stroke. It tells you the main journal diameter.

 

[redmax51]

A 400 crank and a 350 crank doesn't tell you the stroke. It tells you the main journal diameter.

Yes it does,a 400 crank is from a 400 a 350 crank is from a 350,what are you talking about??
They turn the 400 journals down to fit the 350 block.It is a 400 crank.

 

[338Shooter]

No it isn't. The block has 350 mains and a 3.75" stroke crank in it right now.

They used 400 crank motors back in the day, the aftermarket has much more support for the 2.45" mains (350) and anyone building a stroker these days is going to be using a crank built for 350 mains and a 3.75" stroke. There are a lot more options doing it that way.

 

[AKmoose]

Got some snap gauges and calipers you could use.

 

[Honey Badger]

383 uses a 350 block with a 400 crank..

This. Big +1

 

[338Shooter]

Yes it does,a 400 crank is from a 400 a 350 crank is from a 350,what are you talking about??
They turn the 400 journals down to fit the 350 block.It is a 400 crank.

What are you talking about? 350/400 refers to the main journal diameter. It doesn't mean the crank came out of a 350 or a 400.

The motor will be running a 350 main journal size crank with a 3.75" stroke. It isn't turned down. A machinist would probably laugh at you if you asked him to turn down a 400 crank for a stroker project because there are so many cranks with the stroke you need and 350 sized main journals.