Attention Nova 350/255 stock combo.

[Adam Strang]

Looks like a 301 Pontiac head.....

[Rich Biebel]

A closed chamber BB Chev and the chamber walls have been hit with either a stone or a cutting tool to unshroud the valves.....both intake and exhaust.


In ancient times we used to use an oversized top cut stone with a flatter angle and cut only the intake chamber wall back some with a smooth radius. Could not get away with that on the exhaust side.


Then Bead blast the area and then do what was the accepted and legal VJ of 3 angles and no more than 1/4" larger than valve O.D. top cut.

Many BB heads had a smooth area around the intake and it blended into the chamber wall so you could get away with copying that and making it bigger.....unshrouding the valve....

We did heads and blocks for T/K and they went on record holding cars well know in Div. 1

I did numerous sets of LS-6 heads.....from new castings....before the era of welding.....We did epoxy intake runners on SS heads but nothing more than that....

[Billy Nees]

Originally Posted by Adam Strang

Looks like a 301 Pontiac head.....

What's a 301 Pontiac? Is that the head casting #?

[HP HUNTER]

Originally Posted by Rich Biebel

A closed chamber BB Chev and the chamber walls have been hit with either a stone or a cutting tool to unshroud the valves.....both intake and exhaust.


In ancient times we used to use an oversized top cut stone with a flatter angle and cut only the intake chamber wall back some with a smooth radius. Could not get away with that on the exhaust side.


Then Bead blast the area and then do what was the accepted and legal VJ of 3 angles and no more than 1/4" larger than valve O.D. top cut.

Many BB heads had a smooth area around the intake and it blended into the chamber wall so you could get away with copying that and making it bigger.....unshrouding the valve....

We did heads and blocks for T/K and they went on record holding cars well know in Div. 1

I did numerous sets of LS-6 heads.....from new castings....before the era of welding.....We did epoxy intake runners on SS heads but nothing more than that....

How do you get a 60 degree angle that wide (.110) on any production BBC head with a factory installed 2.190 intake valve? Anyone..............

[oldskool]

Originally Posted by billy nees

what's a 301 pontiac? Is that the head casting #?

lol !

[Dan Fahey]

Guess you can weld Cast Iron !

[Adam Strang]

Don't play games Billy you know that's the pic of the superseded head for a 301. Cya at the Dutch.

[GEORGE PETERSON]

Most combos that can run 1.20 under and are factored at less than 1 HP per cubic inch are under factored.

[B Parker]

So George what combo do you run? If you use your logic the 350/255 hp motor rated at 280 hp should be rated at 350 hp. That would add about 700 to 800 pounds to most of those that run it. Almost every combo is capable of running 120 under. If you want to spend money and time. Barry

[Larry Hill]

Will any of the AA/S or AA/SA run in the 9.40's?