Mini Rat Dyno Day
Took my Home rebuilt 402" BBC and ran it on a local Dyno today. Better than I was hoping for.
Here is the combo:
Blown 408 BBC 93 Octane 8.0:1 Comp ratio 32 Total Degrees timing
402" bored .030 over 2 bolt main, studded
Stock Forged Crank cut .020 and polished and doubled keyed
Stock GM Forged Rods
Old School Forged TRW Slugs (they were in it when I got it)
Mahle Steel Rings
(Basically I honed it and put the rings and bearings in it and it was in decent shape, could still see cross hatch from previous build.)
AFR 265 Heads - partial CNC
Comp Cams 242 - 254 @ .050 113LS Hyd Roller Morel Lifters
8/71 Dyers Blower 20% underdriven with 2 750HP carbs
578 ft lbs at 5300
674 HP at 6500 and still gaining... we shut it off at 6500
It made over 500 ft lbs from 3200 +
We left it fat and happy, it was at about 11.5 ratio at WOT
5.45 lbs boost at 6500
I was happy with the result, I was looking for 640-650 on the dyno and hoping for 600+ in the car. We could have easily made 700 on 93 with a little more compression or timing or boost. But we would be testing the limits of the stock block, crank and rods.... and my pocket book!
For a street motor that will rarely, if ever see over 6,000 rpm, I am very happy for what this little rat did.