041 X heads

[Cdncarnut]

Originally Posted by Hacksaw

Never heard of a 041 X head, and I live in Canada.

That is because you did not spend years with your nose in Colvin's books before the Internet became the source for all info.

[Rich Biebel]

The X was found on a number of different castings including '441's

The '461 X was the most popular head in C/SM when that class was so popular. It did have larger intake runners and since porting wasn't allowed that's the head everyone tired to get.

I've seen other casting numbers with an X in various places but it usually didn't mean anything as far as runner size when we checked them many years ago

I've seen the X on the casting surface in various places and down inside the water jacket with the head facing you chamber side up....

Maybe there are people that know for sure why that was there and if they are any better but I am not one of those folks...

[SSDiv6]

All the original 041X cylinder heads had 1.94" intake and 1.50" exhaust valves and used on the SBC 350/300HP engines.

If there are any 041 or 041X cylinder heads with 2.02" intake and 1.60" exhaust valves, they were modified and they also needed to unshroud the combustion chamber to clear the valves.

[Billy Nees]

Originally Posted by Rich Biebel

The X was found on a number of different castings including '441's.

The hot lick on my 307 Nova Stocker is the 339X.

You doin' OK Rich?

[Henrys Toy]

Originally Posted by Billy Nees

The hot lick on my 307 Nova Stocker is the 339X.

You doin' OK Rich?

Good afternoon to all,
All of the 441 X heads have the smallest CC intake runners. you had to be aware of the direction the 441 was cast into the head, I have not found a 041X head. I know that doesn't mean they don't exist. I have a couple of 041 heads - No X !
The 461 X head got all the notoriety because the intake runners were larger. Many people then thought that held true for all other castings with an X designation. The only way to be absolutely sure is to CC them yourself ! There is way too much hear say information out there.
Buyers - Beware !

Respectfully,
Henry Kunz 1534 H/SA

[Rich Biebel]

Originally Posted by Billy Nees

The hot lick on my 307 Nova Stocker is the 339X.

You doin' OK Rich?

I’m doing ok Billy, thanks for asking !

Some days better than others. Looking forward to spring and being at a track even if it’s just to schmooze with all my friends.