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. then once your mechanicals are done when you decide to run a cam that large you need to start looking into tuning otherwise your truck will still do nothing even with the right parts.1.
Or alot more steady studying on your part as well. theres reports of roller motors all the way back then and not the newer ones. also forgot to add that im pretty sure your nowhere near the 9.5:1 CR the thumpr is gonna requireĪs far as it being roller or flat, take it apart and find out. thumpr isnt even a good cam choice for a carb, they sound ok, they idle for ****, have ****** power and torque curves, and my utmost favorite is produce barely any vacuum so your just left with a screaming death trap that doesnt run right and wont stop your truck worth a damn, as well as adding the fact that your cylinder heads wont take that cam, your intake will not breathe what that cam desires and your 95 trans will be toast without further modifcation as well. 050 and an lsa around 112-114 is what any cam that will work decently needs to be at. I wanted to start off by saying you clearly know nothing about the engine your working on but ill play nice,Ĭonsider a factory tbi cam, low lift, around 220/230 duration at.
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