Ok, I know how to rebuild these little guys but what cast irons are the best, I have a bunch of 13b's that are torn down out of 2nd gens and I have 3 12a's out of first gens. I just am not sure if I should just stick to the 12a parts orif there are better cast irons.

Thanks

 

i dont think any irons out of the 13bs fit, unless its a gsl se, cause i know some people use the se center iron for its injector spots, i think fc engine has the oil ring in a different spot not too sure, though,

 

86+ the coolant seals were moved. Only the 85 or older irons will work.