Thread: Want to increase performance/efficiency Newly rebuilt 91 chevy 350 TBI

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Welcome to CHR! We're glad you stopped by and hope you decide to stay. Lots of good ol' hot rode folks here. Need a bit more information on your build:

Do you have some numbers for the heads and the cam? Heavy duty can mean a lot of things from valve springs to screw-in studs to hardened seats, etc. The term "RV cam" is all over the place and while it typically means the cam is ground to produce torque low in the RPM range that's not always true.

Do you know the compression ratio?

TBI stands for Throttle Body Injection so I'm thinking that you kept the TBI intake manifold and do not have a carburetor?

What vehicle is this going into?

What transmission? If automatic, stock or aftermarket stall converter?

What rear end ratio?

What is your goal with the engine - i.e., street cruiser, daily driver or?

Fill in the blanks and we can help you out.
Glenn

By trade I'm an aircraft Mech. and can take anything apart and put back together. With that said, I don't know that much about rebuilding automotive engines. I bought a 91 GMC Sierra with + 200K miles on it and took the engine 350, 700R4 xmission, complete wire harness inside and out along with the factory computer, steering column and overhauled everything and put in my Jeep Wrangler. The heads are the factory specs just a thicker cast. The Cam is a MTC-1, Duration 278/288, Lift .420/.443,...The motor is in the Jeep and runs great, just want to make it more gas friendly...I believe all the problems are in the computer. With bigger pistons, a different cam, headers, it is not as crisp as it could be. Should'nt smell raw fuel from exhaust!!! Is their a programmable computer that could be installed??

Do you know the compression ratio? Don't know, how do I figure out?

TBI stands for Throttle Body Injection so I'm thinking that you kept the TBI intake manifold and do not have a carburetor? Yes, factory TBI carb.

What vehicle is this going into? 87 JEEP wrangler

What transmission? If automatic, stock or aftermarket stall converter? Stock 700R4

What rear end ratio? 3.55

What is your goal with the engine - i.e., street cruiser, daily driver or? Fun Toy only driven 5K a year or less