The development time for the good heads took him approximately two months of work.
It included destroyed heads before finishing the good ones. The amount of my time on valve jobs with various valve sizes and the flowbench testing each variation after he gave the head to me isn't even in the time estimate. I'd put in a bigger valve and he would rework the heads. Finally at 2.25/1.81 valves we couldn't fit in any bigger valves and we finished up the porting. Hourly rate wasn't even a worry as this set was for us......and only us. I don't even remember where the second set of heads went.
It was about trying to be the best at what we did.
The 906 heads on a 500ci 440 made 730HP with 93 octane and 15 bent valves on Comp Cams dyno. One cylinder even had 56% leak down. They still have the bent valves in them.
How many Edelbrock 440 RPM heads ever made 787 HP normally aspirated on 91 octane pump gas from 451ci? The ones I know of can be counted on one hand using only one finger. Uh, the index finger.....not the middle one.
The RHS X heads made 629 HP/572 TQ on a 424/360 on 91 octane pump gas from the Stinker Station.
The effort never turned out to be financially worth it and the ego stroke was fleeting.
I wish I'd quit reading these damn threads.
