I have yet to find any mention of this on the exhaust thread, but why are nearly all aftermarket headers circular port when the tbi and vortec heads have rounded square port? I see people linking circular port headers to thr exhaust thread too. Are they aftermarket circular ones just so big that...
Not sure if I'm about to reply to someone or what's going on, think in in the right thread. First post so bear with me. Anyways, I got a problem with my oil pressure gauge on my 93 k1500 5.7. the gague is all the way maxed out unless the engine is warm and under about 700rpm, at low driving idle...