I recommend getting a flowmaster Y250300 collector from favorite vendor and cut it down pretty short and where the NASTY T looking y section of the factory y pipe is have that cut and new pipes bent to connect to that flowmaster y.
Well honestly the exhaust manifolds are fine up to 250hp builds but the Y pipe is TERRIBLE and the single 2.5″ exhaust is too small. Change the WHOLE thing from the engine back. So start with a vortec 350 and not a TBI 350 is my main words of wisdom.ġ. If you need assistance finding one, do a search on or check out the great deals on new GM 元1 vortec 350 engines listed on the recommended engines tab. The cost for those extra 45 cubic inches isn’t very much and worth every penny.
Pickup a used 350 preferably a 1996+ vortec 350 and build on it while you drive around in the 305 and then just swap over. Also, if you want to make over 225hp, don’t mess with the 305. I tried to put these in order of importance. (exhaust, airfilter, intake, cam and heads). there are 5 general horsepower killers on the Camaro TBI. The trucks use a flat tappet cam and if you must mess with the 305 in the trucks then there are recommended flat tappet cams on the 350 V8 modification page although the truck blocks do have all the roller cam provsions and so I would grab the roller stuff out of one of the car engines as that is 10-15 free horsepower for roller cams. Throttle response is noticeably crisper, and we don't feel like we have to floor it as often to get where we are going.Not very many 305 trucks out there but other than cam selection most of the same issues apply. The truck is more fun to drive and much quicker. Now the transmission feels like an actual four-speed. We noticed an immediate improvement in on-road drivability. Our truck rolls on 37-inch tires and weighs 5,400 pounds. Our engine is backed with a stock 4L60E four-speed automatic and 5.29 axle gears. But what is more impressive is the incredibly flat torque curve that hovers around 280 lb-ft all the way up to 5,000 rpm, which makes this a great engine for towing, dirt abuse, and daily driving. The cam swap bumped us up to 245 hp, and with the computer tuning, we hit 268 hp. That 20 percent reduction would have put our stock 255hp 5.7L at around 200 hp at the rear wheels. For our application, 20 percent is a bit conservative given the Ford 9-inch rear, tight gearing, and bigger tires, but that's what we'll go with to be conservative. However, you can generally figure on about a 20 percent loss of power through the drivetrain. Unfortunately, we were unable to get a baseline on the dyno before the cam swap.
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