Silverado 4.3L to V8 swap - Help Please

wrrichard · February 24, 2005

I'd like to put a V8 in my 1993 Silverado. It came stock with a 4.3L V6. Does anyone know what parts I need to change besides the engine? Any input is appreciated. Thanks.

facn8me · February 24, 2005

That should be fairly simple. Let's see, all your 4.3 accessories will bolt right up. need a v8 fan shroud. v8 radiadtor hoses and a v8 ecm. all the wires hook up the same. Fuel pump will be fine if you run a tbi v8. Exhaust work to finish it up.

wrrichard · February 25, 2005

Hey, thanks for the quick reply. Will I need a larger radiator?

facn8me · February 25, 2005

Probably not. The 4.3 is not really that much smaller than a v8. It is actually a v8 with 2 cylinders cut off. They use the same water pumps and starters same trans bolt pattern torque convertor bolts right up. All the 4.3 brackets will bolt up for the a/c alt and p/s and pulleys.. p/s hoses and a/c hoses should be long enough. May have to lengthen a few wires. Just take your time and do it right.

wrrichard · February 25, 2005

Concerning the TBI, I've heard the unit I have now is too small, but is it possible to replace the injectors with new, larger ones, or would it be better to just replace it?

PS: Thanks for all the help!!

citydriver · February 25, 2005

Concerning the TBI, I've heard the unit I have now is too small, but is it possible to replace the injectors with new, larger ones, or would it be better to just replace it?

PS: Thanks for all the help!!

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I think the throttle bores are smaller on the 4.3TBI (less CFM), it may be better to replace it with one from the same size v8 you're planning to use

99-2door · March 4, 2005

Regarding the radiator.

The 305 and the 4.3L had the same size radiators from the factory, but the 350 had a bigger one. I would use the 350 radiator no matter which V8 I was using.

Also the 95 radiator is bigger than the earlier ones.