TBI 400 Small Block

[Xenon]

If memory serves me, the Coolant temp sensor is the only thing I would loose by not switching manifolds... Is there anything else on/in the TBI manifold that wouldn't be on the carb'd one?

[EagleMark]

EGR? Exhaust cross over from heat riser valve on one side of exhaust? Don't know what intake you have? Both those help MPG and cold warm up and drivability...

[Xenon]

Hmm... it has the exhaust crossover but no EGR. Will have to think about that...

[EagleMark]

I've never done one but read where two bolts on intake need to be ovaled out to mate with hole on old head... probably find info on that at CK5.org

[PJG1173]

done that before its kind of a pain.

[Xenon]

I've never done one but read where two bolts on intake need to be ovaled out to mate with hole on old head... probably find info on that at CK5.org

I'm a member at CK5... good site. It's actually because of your signature, at least I think it was you, that I found this site. Saw

1990 Chevy Suburban Silverado 5.7L 2wd HiWay Lean Cruise 17.5 MPG WOT 12.5 AFR ECM 1227747

and was immediately interested... googled highway lean cruise and found this site...

[1leg]

I'm also a member on CK5. use a TBI adapter. Like said the EGR eats up a few horsepower but it will help with fuel mileage. I'm told its worth about 1-2 mpg. But i'm new to turning. Personally i wouldn't let the no egr to keep me from switching back to the TBI. good luck