The 4.3 is nothing more than a 350 (5.7) W/2 cylinders cut off. Multiply 5.7x .75 and yoiu get what? 4.275 = 4.3 Really, they took the patterns for the heads, block and manifold and modified the castings. The crank of course is different.shnitzelman2001 said:
NOW! Do you want to know the really great news? The front and back of the engine are I-D-E-T-I-C-L-E to the 350. Same water pumps etc. but more impotantly, the bell housing bolt pattern and motor mount are the same.
Get the picture? It is a no brainer to stuff any SB chevy engine into an S-10. There is even room @ the front of the engine bay, for thoae extra 2 cylinders. The SB chevy is the easiest engine in the world to mod. W/ stock parts, you can biuld a budget 350+HP engine for next to nothing. A "71" and earlier rebuild kit has flat top pistons, couple that W/a set of small chamber 305 heads and you will have about 11.8:1 CR. Put in the right cam and you have a little monster that might get you deep into the 12s if you can get it to hook up.