HP on Mexican 350 4 bolt mains

amp1956

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Is there an app for this forum I am enjoying the hell out of it
 

63Half-ton461

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1978 Monte Carlo 383 slammed
This is getting interesting, because GM only started casting 5.0 and 5.7 on blocks cast after 86 when the block went through a redign that made it a one piece rear main seal and than a year or two later, roller cam capable.

What is the casting # at the back of the block ?

207, 638, 880 number will start with a 10 or 14.

I was going to mention you have a bunch of cheaper (and much better) head options as GM made a bunch of small chamber heads in the 10 years preceding the Vortec, combustion chambers very similar to the vortec with wall design and more centrally located spark plug. The 217 casting is one example.
 

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amp1956

New Member
Joined
Dec 2, 2019
Messages
14
Karma
2
Car
55 chevy
This is getting interesting, because GM only started casting 5.0 and 5.7 on blocks cast after 86 when the block went through a redign that made it a one piece rear main seal and than a year or two later, roller cam capable.

What is the casting # at the back of the block ?

207, 638, 880 number will start with a 10 or 14.

I was going to mention you have a bunch of cheaper (and much better) head options as GM made a bunch of small chamber heads in the 10 years preceding the Vortec, combustion chambers very similar to the vortec with wall design and more centrally located spark plug. The 217 casting is one example.
It's covered up now and we been getting rain but I will look 1st chance I get thanks for all of your help I really enjoy taking about this
 

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