Block casting number 3932386 question

[ChevLoRay]

I got the casting number from my block, you know...the number that's behind the drivers' side head? Then, I went to the nastyz28 site and located the numbers. Ready? 3932386. The list showed 3 different applications, none of which were for a truck, necessarily. The first listed app is a '69 Z28, 302/290 horsepower 4-bolt mains. The engine ID doesn't end in anything that says DZ. The next app is a 69 327 210horse 2-bolt mains. Then, it's a 69 350/300HP 4-bolt mains LT1.

The engine ID (last letters) indicate my engine to be a 255horse, 350CID, 4-bbl engine with a TH400 in a truck. That agrees with my SPID sheet.

I reckon the same block casting number can be used in different apps, but you'd think that my casting number would have also been shown to be in trucks.

Reckon I oughta let the website owner know what I have?

[too much stuff]

Looks like a pass car to me. 327 or 350 from 68-74. Are you sure the last number is a 6 and not an 8?

[ChevLoRay]

Yep. The engine ID, on the pad in front of the passenger head ties the engine to my SPID sheet.

But, just to be safe, I'll go re-read it and get the ID number, too. I've had this truck for 11 years, so I feel good about what I have.

Like I said, just because the casting number indicates what it does, doesn't mean that those castings are used exclusively for the apps that I listed in my first post. Don't all three of those engines use the same bore ID and spacing? Stroke is the only real difference, although I also know that compression, number of bolts on main bearings, etc., are going to be different based on what the engine is to be.

Now, let me go get those numbers......

Block casting number is re-confirmed....3935386.

Engine ID is V0924WK

[too much stuff]

What is the date code on the block?

[ChevLoRay]

Where do I find it? The engine is on a stand, but still buttoned up.

[bruceman1968]

On the back flange near the casting number. Might be on the back pass. flange, I can't remember for sure, But it is CAST into the block, not stamped.
It is a letter followed by 3 numbers. Your first digit is probably a I and your last digit is probably a 9.......... As in I??9

[beautimus]

I just went through this with a 6 cyl. engine. Several board members helped me find the id of the engine. From what i now understand, casting numbers don't mean much, because castings are pretty generic. So i gotta go with the id code on the block. The exact oposite is more important to me for cylinder heads because the shape of the ports are what a particular casting offers. That and wheather or not you have hardened steel exhaust seats, for unleaded fuel in place or if you have to have them added to an earlier head. just my feelings on casting numbers verses engine id numbers.
Tony