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oldskool · 02-20-2020, 08:30 PM

Copied this from a 2014 rule book.

"...Porting, polishing, welding,
epoxying, and acid-porting permitted. Grinding and polishing in
combustion chamber permitted..."

I know absolutely nothing about SS head porting.

Just by what I read in the rule book, I ASSUMED that most any mild street porting job would be legal, in SS.

BUT, a guy on another forum suggested that ANYTHING that increases the volume of a stock factory port is illegal. I mean, even just a mild gasket match will increase port volume.

I was just trying to figure what kind of head work it would take to build a low buck Pontiac SS engine, that would have just enuff power to run the index, or just slightly quicker.

There are several Pontiac shops which offer mild street porting jobs which increase flow enuff to make the required power.

So, for you guys who know, is mild porting illegal, even just a gasket match, if it increases the volume of a single port, even a little ?

I mean, the acid ported Stocker heads have larger than Stock volume ports, don't they ?

Need some technical clarification on what is & is not legal for SS heads.

Thanks !

02-20-2020, 08:30 PM	#1
oldskool VIP Member Join Date: Dec 2014 Location: The Land of Bayous, Boudin & Crawfish Posts: 1,668 Likes: 223 Liked 750 Times in 361 Posts	SS Head Porting Rules ? Copied this from a 2014 rule book. "...Porting, polishing, welding, epoxying, and acid-porting permitted. Grinding and polishing in combustion chamber permitted..." I know absolutely nothing about SS head porting. Just by what I read in the rule book, I ASSUMED that most any mild street porting job would be legal, in SS. BUT, a guy on another forum suggested that ANYTHING that increases the volume of a stock factory port is illegal. I mean, even just a mild gasket match will increase port volume. I was just trying to figure what kind of head work it would take to build a low buck Pontiac SS engine, that would have just enuff power to run the index, or just slightly quicker. There are several Pontiac shops which offer mild street porting jobs which increase flow enuff to make the required power. So, for you guys who know, is mild porting illegal, even just a gasket match, if it increases the volume of a single port, even a little ? I mean, the acid ported Stocker heads have larger than Stock volume ports, don't they ? Need some technical clarification on what is & is not legal for SS heads. Thanks !