Cracked Block

[dannyual767]

Re: Cracked Block

A GM truck engine block is a 4-bolt (mains) block. Now these blocks could have come in a car or a truck. But us GM guys refer to all 4-bolt main motors as truck "blocks". When you are replacing a motor in a GM equipped boat it most defenitely should be a truck block. Cams and heads can be changed to what you need. But a GM boat motor should always be a truck block.

I know this isn't a thread about the semantics of engine blocks but I'm just going to stir the pot here on this statement. I've been into high performance for almost 30 yrs and I used to work in a machine shop that built a lot of engines. I've got 10+ yrs of Chevy High Performance, and Super Chevy magazines and none of them call a 4-bolt mains block a truck block. I've never heard that a 4-bolt mains Chevy small (or big) block was referred to as a "truck" block. They are referred to as "4-bolt mains" blocks or simply "4-bolts."

I will agree with you that most, if not all, GM heavier duty trucks use a 4-bolt engine. Your standard, everyday 1/2 ton pickup truck, I'm not sure.

Like I said, just stirring the pot a little .

 

[dannyual767]

Re: Cracked Block

Being a Ford guy.
What is a "truck block?" As far as i know there are 2 bolt, 4 bolt, and bow-tie blocks from the factory. With acception to the bow-tie they are put in any and all as random as can be. And if you really want to get down to it, the 2 bolt is a better block than the 4 bolt.
The only way to make sure it came out of a truck is to check the VIN number as the original motor matches the vin of the vehicle.

This is most definitely true of a 400 sbc. There is more meat in the main web areas on the 2-bolt blocks resulting in a stronger foundation. They'll handle a ton of power. If you want better, have a set of aftermarket, splayed 4-bolt main caps installed. Very strong!