543

not that I have any experience in these matters,however, reading the BBM book talked about heads and cubic inches. If I remember correctly,the Indy SR and Stage 6 would be fine up to 470"(?). IF the Procomps were considered a large port, then those would work. It's been awhile since I've flipped pages in that book. And not that they won't work,maybe not to the extent that a larger set would. By virtue of cubic inches, it would seem you'd gain there but torque would be the big winner if the head was too small.