when i ported my 18 i did the porting then filled in the gaps from the imrc's and smoothed it out so it was like the imrc's were never there. just smooth runners
if you run e85 you want your o2 sensor installed at a slight downward angle. if you have them installed at a downward angle they will last just as long as on gasoline.
this is not 100% accurate.
the heat range is the amount of heat a plug retains not how hot it sparks. a plug two heat ranges colder will still produce the same spark. the voltage doesn't determine how much heat a plug retains ether. heat range refers to the insulator. on e85 the combustion is...
everyone gets the GEN 3 intake manifold and usually gets it ported. We all seen that it does good up against other manifolds, but they always put the ported 18 up against stock manifolds so how does a ported GT 350 measurement or a ported stock manifold. I don't think I've ever seen a Dyno pull...