Just got my Indy 440-1 heads back from Larry Smith. Awesome work! They look great. Started with OOTB 15 year old 440-1's. New Manley Severe Duty valves, opened the intake ports up to 572-13 openings to smooth out manifold transition, fresh valve job.
What kind of HP/ET gain should I expect going from a box stock 440-1 to fully ported? He's showing 390 CFM @ .700 lift.
Car specs:
68 cuda tube chassis 2950 w/driver
446 cid 13.5:1
284*/284* .704 lift Roller w/1.6 rockers
1050 Dom
4800 stall
4.30 gear 14x32 slicks
6700 shift
Previous best 9.80 @ 137mph / 6.20@110mph