Looking for more 408 pull at the big end?

B3422w5 said
Head( if its any good) is enough to go 130 mph in an A body. Its too small for sure, but it will support 550 horse falling off a log on the right shortblock... But if the head is any better at all than stock i would guess most of the problem is the convertor. Its definitely hurting that combo - Should run high 90’s in the 1/8, 122 or so in the 1/4

I think it should too. I figured I was on the right track. Thank you.

crackedback said
Either the tune up is WAY off or the heads don't work well. Brians Duster went 96 with 408 making about 480hp at 3350# with a 4.56 gear and hughes 3500 shelf converter. Timing, jetting, air to carb, something isn't right as the MPH is way down. If your car is lighter than Brians, It's REALLY off tune wise.

Its light. I have not spent a lot of time on the tune. I was just getting warmed up and breaking it in taking it easier with 90% hits.

thesiren74 said
6,000 seems a little low? My brother shifts at 6,300 with his 410 from 6,000 and picked up a bunch.

Yes, that is right. I was planning on a full RPM run after a few more passes and a solid nut & bolt check. I figured 6000 was good for now then sneak it up to maybe 6500.

All of this is very much appreciated.