how far under in stock at Indy to qualify

[X-TECH MAN]

Originally Posted by Jeff Stout

Thank you. I never knew it would have been as much as 4 to 5 tenths. I need to get out more often

It depends on the make and model of the head. Chevy not so much. 383/440 heads a lot. Just filling the heat riser on the 383/440 MOPAR was worth about 24 HP on the dyno. Filling the dual heat risers helped a lot on those type of heads like Pontiac.. Some Fords are not so great either. I have not looked at the newer FI stuff. Remember this was with the older cast iron heads.