Today I bought a Edelbrock performer manifold for a 350 olds for $100, to sweeten the deal The guy threw in some complete heads for free. I want to know what they are off of , what year etc...


They are Stamped big #5 on the outer on each end of the head and have a number what looks to be 3977422 on the inner along with a GM stamp..

Will these work on my 1974 350 olds motor as a bolt on deal ?

Thanks..

 

Probably the best stock heads out there(except for w-31 prepped heads).

68-69 350 heads
64cc chambers

You have 8 heads? They have 79cc chambers.
It's going to push your compression up, but I don't know how much.

Anybody?

 

68cc.

The 64cc number, as posted on 442.com, is an error.

Norm

 

Maybe we can post a "sticky" that says
"*** auchtung!#5,6,7 heads are really 68cc's***", in the smallblock forum.
It's been posted everywhere I know, what more can be done?

If you don't want those #5's...

 

I will send them in to get reconditioned sometime this week. Thanks for the input guys. I read about the #5 heads but just was not sure if there was more than 1 kind or what. I'm new to this v-8 stuff.

I also have a lead on a early 68-72 rebuilt longblock rocket motor for $400 that I will purchase as my buildup engine, so I can still drive my car in the meantime while I gather all my "go fast" bits.

 

That's exactly where I got it...

I'm not a small block guy I guess, sorry for the error.

 

Don't confuse design chamber volume with as-cast volumes. Olds heads almost always come in larger than the blueprint volume. I assume this was done to accommodate manufacturing tolerances as well as to allow for a head resurfacing over the life of the car. One of the things that should be blueprinted when building a motor is the chamber volume. Of course, the chamber size by itself is irrelevant. What matters is the total compression ratio, taking into account head gasket thickness, piston dish, and deck height of the piston as well as chamber volume. Changing from the factory steel shim head gaskets to the thicker FelPro gaskets makes a difference as well.

 

Remember, also, that numerous valve jobs can easily add 2-4 cc's to the chamber.
However, that being said, I recently did a set of #5 small block heads, and still had to cut them .030 to get to 64 cc's.
The valves were NOT sunken down, I went to 2" intakes, hard seats on the exhaust, so they were up high in the virgin chambers.
64 cc's were on some early 330 castings, but never on the 350. These castings always come in at 68-70cc's, stock.
After this measurement, add the other numbers like Joe said, and do not forget the dead space above the top ring. You're lucky to end up within a full point of the first calculation.
Jim

 

Design volume = What was left, after the "as cast" casting was machined.

I assume the factory adhered to the accepted production standards of the day.

Norm