Nicks Garage 383 build

Unported 906’s with SBI replacement valves, good valve job with bowl cut, milled to about 77cc, dual springs.
Flowed low-230’s.
TRW pistons at +.020, with flycuts, steel shim gaskets, stock rods, stock cast crank from a 400(still externally balanced).
Comp SFT, 256/262-106, isky rockers, RPM, various DP carbs.

460tq/480hp

11.26@119, 3670lbs, flat hood
11.18@123, 3550lbs, upgraded fuel system & 6bbl hood

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With the stock intake and stock AVS carb, a swap to the RPM was a 26hp gain.
An HP750DP was worth nothing over the stock carb on the factory intake.
With the RPM the HP750DP was 13hp better than the stock carb(39hp over the stock intake).