Need big block help

I’d be looking at valvetrain stability issues, and/or some EFI unhappiness.

Cam is quite small for that ci…….. but should still be more than enough to make a solid 1hp/ci.

We did a 505 a couple years ago, ez295 heads, same intake, brawler 1050 carb, 245/251-110 HR cam, made 640/640, peaked at about 5900.

The bsfc numbers on the dyno sheet are way off…….which could just be how they were reading the fuel flow with the EFI.

I don’t know what the elevation is at the dyno facility, but the sheet is showing a 7% correction(which isn’t really unusual for July)…….. so the uncorrected power was barely over 440hp.

Basically, it’s a situation where the engine is way down on peak tq……. And is never able to recover from that…….. and as a result, the hp is also low.



I agree.
Looking at the invoices the one thing I don't see is valve springs. I know my on my combo, I had to change to heavier springs due to the increased mass of the hydraulic roller lifters.