And what did this rebuild consist of? What have you changed since it ran last?
Putting a piston back in that had MAJOR detonation issues (i.e ripped half the skirt off the piston and chipped the top of the piston). Other than the new piston, rings, all new gaskets and new plugs, just a new ignition cylinder switch and a new ignition module.
04 Impala SS -- SOLD 08 Prix GXP -- FWI, 3in DP, TR6IX plugs, Ported & polished throttle body, ported intake manifold, DiabLEW Tuned, wrapped crossover pipe, Cat delete, Factory res., Muffler delete, Poly motor mounts, shift kit, LED bulbs in just about every Da*n thing, ect..