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Mike Pearson · 02-22-2021, 10:58 AM

They allowed it long before it actually became legal by the rule. Porting and covering it up with blasting and acid was common before it was legal by the rule. Mid to late 80's would be my recollection on porting. Chamber mods came after that as a separate modification t the rules. Early on there was no port CC size and the ports were not poured during a tear down inspection.

02-22-2021, 10:58 AM	#2
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,454 Likes: 617 Liked 1,943 Times in 584 Posts	Re: Super stock head porting They allowed it long before it actually became legal by the rule. Porting and covering it up with blasting and acid was common before it was legal by the rule. Mid to late 80's would be my recollection on porting. Chamber mods came after that as a separate modification t the rules. Early on there was no port CC size and the ports were not poured during a tear down inspection. __________________ Mike Pearson 2485 SS