Yours must be newer than my brother in laws truck because his was a single speed with the same Torq .21 engine.

Without having a reply with several quotes in it, the LRP spec 3 is the same engine as the Losi 454 with a different head and crankcase markings. SH makes the LRP, dynamite/Mach, XTM, and many others. The Losi 454 is probably the cheapest of the lot. A Picco would be a great engine for the money but you have to be a good tuner with those.