4.3L blocks and year compatability

[gierrmo]

I have a 1989 4.3L OMC cobra io. The engine threw a rod and i am looking for a short block to rebuild. I've been told that any rear wheel drive GM from 1987 to 1991 will have this block. Is this true? and do the auto engines rotate the same? I've found an 84, will it work?

 

[gierrmo]

Re: 4.3L blocks and year compatability

If anyone knows of a link that lists GM 4.3L blocks and what years they were the same, this would help me out thanks

 

[cannonfodder]

Re: 4.3L blocks and year compatability

I think ,and I am not an expert but as long as you don't get into the years with a counterbalance shaft you should be allright. Only the block,rods and crank. Maybe this will get someome to correct me if I am wrong. Bryce

 

[denniz]

Re: 4.3L blocks and year compatability

Ive got a good 4.3 block Does yours have a mechanical fuel pump? If so I have 2 of those blocks. Both will have to be rebuilt. Im in Fort Worth so were not to far apart. 35s all the way.

 

[ODDD1]

Re: 4.3L blocks and year compatability

Rod's right... if you find one with the correct fuel pump mounting boss you will be safe...

 

[denniz]

Re: 4.3L blocks and year compatability

also one or two peice rear main seal? ( the oil pans are different too)

 

[gierrmo]

Re: 4.3L blocks and year compatability

I know it has a mechanical fuel pump, but i'm not sure about the rear main, I haven't pulled it yet. I don't think the my block is salvagable, it through a rod and oil and water poured out the bottom. <br />Rod, the blocks you have, have they had any freeze damage in the past? I'm hoping to find one that i can re-ring and newbearings and possibly have to have the crank turned and new gaskets and seals and be ready to go.

 

[denniz]

Re: 4.3L blocks and year compatability

Ill look at them today but Idont think there is any freeze damage.

 

[gierrmo]

Re: 4.3L blocks and year compatability

thanks let me know e-mail me a price if you want, wbonner@okstate.edu

 

[denniz]

Re: 4.3L blocks and year compatability

No freeze damage. Areyour heads OK? It has a detonated piston(whole burned thru it) std bore ill check on the price.

 

[gierrmo]

Re: 4.3L blocks and year compatability

I believe my heads are fine, I'll find out for sure though

 

[denniz]

Re: 4.3L blocks and year compatability

I checked with the owner he wants to much for it if you ask me $500. He says thats what the cores worth. Have you checked on ebay, im sure you can find a better deal. Sorry I thought it would be a good deal for you and personally I think thats too much.