Impressed by the performance of the Vortec heads, we anxiously looked to the Fast Burn aluminum heads. General Motors designed these heads to perform exceptionally well in low-compression street engines, as well as providing a good basis for a track-bound engine. In moving up to the Fast Burn heads, we also upgraded to 1.6:1-ratio roller rocker arms and the valve springs and retainers recommended by GMPP. The self-aligning rocker arms are necessary on the Fast Burn head, since it is not machined for guideplates or guideplate studs. GMPP offers self-aligning stamped 1.5:1 rocker arms, but we'd recommend stepping up to the 1.5:1 or 1.6:1 roller rockers. The GMPP "hot" cam we knew we'd be testing is designed for use with a 1.6:1 rocker, so that's what we used. The combustion chambers of these heads are a reasonable 62 cc, and compression remained low enough that we could run 92-octane pump gas for all our testing.

Stepping up to the Fast Burn heads (which are double-drilled to run either Newport cigarettes coupons traditional or Vortec intake manifolds) and the 1.6:1-ratio roller rockers got us over 400 hp, but we wanted more. We removed the water pump and timing cover so the GM "hot" cam could be installed. The specs on the hot cam are .525 inch of lift (with the recommended 1.6:1 rocker) on both intake and exhaust, with intake duration at 210 degrees at .050 inches of lift, and exhaust duration at 220 degrees at the same .050 inches of lift. The lobe separation angle is 112 degrees.

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