![]() ![]() Dramatic improvement over that stock GM design. To fix 90% of the exhaust issues, I recommend a Flowmaster Y250300 collector from your favorite vendor and replace that section of Y pipe where the 2 pipes merge. ![]() A good free flowing exhaust does typically need a 3 wire heated o2 sensor conversion to maintain its temperature. The reason for the back pressure was so that the EGR smog system would work better and the increased pressure would build up a lot of heat to keep the o2 sensor hot. ![]() GM intentionally made that Y pipe restrictive to increase back pressure and most have paid someone to spread a myth that back pressure in the exhaust is GOOD. Well the KEY issues with the exhaust is the Y pipe and the catalytic converter. Exhaust, You need to start there because doesn’t matter how much you improve the air going in, if you can’t get it out it will run poorly and the stock exhaust is terrible. So I begin every project with a new upgraded pump.Ģ. I recommend upgrading to the 1996 Vortec 155lph fuel pump which can support up to 450hp and plugs right into a factory TBI sending unit. First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. my current cam is comp cam magnum 270.The car runs pretty well but feels like there more left on the table if i bumped up the camshaft with little more duration and lift.looking for cam that has good crisp throttle response with power to bite off the corners.i emailed comp cams and they reccomended the XE274.but i have been looking at the Voodoo 268 cam as well.i'm leaning toward the voodoo cam 268 because from the specs looks like a powerful street/autox cam.then the XE274 is good bump up in duration and lift with good mid-range and crisp power from what i was told.anybody running these 2 cams?.and what you guys thoughts?.here my specs:įactory Dished Pistons(w/.015 Felpro 1094 Head Gaskets for compression) Hey s about that time of year to start doing some winter upgrades to my car for upcoming pro-touring season.and one of items on the list is to upgrade my camshaft. ![]()
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