So, after replacing the block of my 462 last summer, I built the 496 with my old Ed heads and a flat tappet cam in a new BBM block. It made similar total power, but picked up torque from the 462. With finding water leaking this past winter from my old Ed heads it was time for another upgrade.
After pulling the shortblock down we found #2-4 cam bearing issues from the flat tappet. This led to another upgrade.
Soooo, it now has roller cam bearings, TF heads(stock), TD rockers to wiggle off my new ROLLER camshaft(.683 lift, 274/280 @ .050 on 104 centerline). This using 12.5/1 Diamond pistons, my lightly worked vintage Dove TW intake and two 1850 Holleys. I've always kept the reigns pulled tight at the shop about turning my motors into "max effort" builds as I always want them to be long lasting "dump truck" motors. To go to this extreme is out of my typical comfort zone(and money), but this has really snowballed from what I originally wanted. Oh well. If I had jumped on the band wagon last summer I would already have a badazz build that would far surpass what I have now. Hind sight is always 20/20.
It got on the dyno Friday afternoon with a quick break in. I got there Saturday morning and made a few pulls to get a base line. It was a touch fat so we knew some carb work was in store. We opened the high speeds up and that got things more in line but still about 1/2 point fat. We took a couple out of primary to just see if it would help. It didn't. Power curve went goofy up top. We jetted it back up and it smoothed back out. I was not going to pull secondary plates and plug/drill them and spend all afternoon trying to finesse it. It is not killing the plugs and this gives me a touch of wiggle room for installation of an air box. I still have the air tubes from 20 yrs ago, just need a box. Buddy will make one for me at his shop. I have a wide band in the car, so I will be able to monitor fuel.
Anyone want to put some figures up before I post what it did? My one stipulation was keeping power at 6500, I don't want to have to run it 7200+. It peaks at 6600. Perfect. It made what we had thoughts off. The flat tappet version was in the 610-620 range with old Ed heads at 6500 rpm.