Need help with 350 head casting #'s..

I'm trying to find out if the engine in my car is original now.. See my other post entitled 9C1 rebuild. I can't see block castings or ID plates 'cuz too much crap's in the way, so I'm dating the heads. Here's some #'s I've found under the valve cover...

4102193
C 15
NAD
GM22
K
1

Hopefully someone suave` with small block casting #'s can help...

on both heads there should be serial numbers at the bottem of them right where they meet the block take a drill with a wire brush adapter and clean them off and youll get the head numbers the block number is at the back of the block where it meets the tranny there should be almost like a little dish in there on the drivers side if the motor is out and you are cleaning it to repaint or add aftermarket parts clean it up at the back of the block then run the numbers from the block it will give you more dates then the valve covers i think im not 100% sure but it sure would be the easiest but good luck with that if you take the time to clean it up youll get all the numbers needed to date it back to see if it is an original it all depends on how much time you want to spend on it to see but anyways good luck hope its original chum

There should have been a "1" in front of that casting number 14102193. You can find all the Chevy casting data at www.mortec.com

It looks like those could be stock heads for a '87-93 305-350.

"193s" are the light duty truck casting, also found on "big" car engines from '87-'93 or so. The same head, in "heavy duty" form is a "191". It has large stem exhaust valves and "hard" seat inserts. These are 350 numbers. The similar 305 head is a "187". There ARE other castings, but these three are by far, the most common.

These are very good heads for making torque. They're not much past 5,000 RPM. They have a "wing" in the intake runner, creating a swirling effect in the charge. It "corkscrews" into the cylinder, making for very good filling at lower engine speeds (torque!).

Jim

Good, 'cuz I'm building a torque monster out of 'em. Anybody think it'll make any noticable gains by extrude honing them?