4.3l vortec interchange

[littlekebb05]

i just got a 93 blazer with the 4.3l vortec. tore it down because it was missing and found it got a cracked head. my friend has some late model motors and heads that i could get from him with the fuel incection assmbly. my blazer has cpi. i was wondering what all will interchange. as in can i put his heads on and the cpi from him on mine and not change the comp.
thanks
joel

[wilfie27]

The 96 and newer heads will not work on a 93 because on the 96+ (casting #'s 772/140/113/114/115 ) have a notch in the intake runners that will cause a disturbance in the air flow. As long as the heads have a casting number ending in 181/209/064 you can use them. They come with either a press in stud or a screw in type. Either one will work but with the press in studs you will have to do a rocker arm adjustment and the screw in have a positive stop. Just torque them to 20 ft lbs.. Some of the older heads with casting #'s 768/248/103/067 have a recess in between the intake ports that make them different. Warning, stay away from the 070 casting heads, 90% of them crack down the left spark plug hole which is unrepairable.

[littlekebb05]

what about the fuel injection. i can get the cpi off of a 96 and newer also. would that work.
thanks
joel

[wilfie27]

the geometry of the heads are the same as far as bolt holes go but I would be concerned about the wiring harness and such. I mostly deal with heads.

[littlekebb05]

that was what i was wondering if i would have to change the computer or wireing harness to put late model cpi would work on a early model cpi computer. and also i am looking for a lower end rebuild kit for one.
thanks
joel

[slammed s10 87]

Originally Posted by littlekebb05

that was what i was wondering if i would have to change the computer or wireing harness to put late model cpi would work on a early model cpi computer. and also i am looking for a lower end rebuild kit for one.
thanks
joel

stay away from 95 cpi parts....they're crap