IROCmatt

ive got a iroc with a 305 running tpi, the engines dead so ive bought a donor car for the engine which is a 305 but has a carb, is it a simple swap over for all the tpi stuff or is there anything i should know.

birdtojag

iTrader: (1)

What year IROC? Also, what year donor car do you have? The only thing you would need to consider is the bolt pattern for the intake to the heads. Also make sure you change over all the sensors. Other than that, it's pretty straight forward.

redltcamaro

you dont have to worry about the heads if the heads on your original motor are good you can just swap that out too

IROCmatt

i have the right manifold to fit thats no problem cars a 86 tpi but early 86 so inlet bolts all the same, donor cars 84 carbed, same bolt pattern. do i have to change the cam shaft or just bolt tpi right on?

redltcamaro

you shouldn't have to worry about the can it should work fine

IROCmatt

ideal thats what i wanted to hear

IROCmatt

i take it i have to use the tpi distributor tho

birdtojag

iTrader: (1)

You can use the distributor that is in the 84 if you have to. There really is no difference in the distributor from carb to tpi. Ignition is ignition is ignition. As long as you hook it up right you will be fine. Just bolt it up and get the sensors in the right spots and go. Good Luck!

IROCmatt

ok cool so we only need to change cam if its the later engine, so looks like i can just drop engine right in and is should be good

Vader

The '86 TPI will need to have a TPI distributor. Yes, they ARE different. The TPI distributor is wider and uses a lower, wider distributor cap. Further, your 1984 system will not likely have the EST bypass connector. In other words, use the distributor which was originally installed on the 1986 with the TPI system.

Also, as much as you might be attempting to make the exchange as quickly as possible, you might consider opening the replacement engine for a quick look at the condition. Unless it has been recently refreshed, it would be worthwhile to at least look at the main and rod bearings, and consider a replacement oil pump. Having a reliable rotating unit will go a long way toward the longevity of the installation. Looking at the cam and lifters while the engine is in a stand is a lot easier than replacing it in the vehicle, and the intake has to be removed in any case. You might also want to look at the heads to see if they are doorstop castings or at least as good as the '416s on your '86 TPI.

IROCmatt

cheers, i am going to do a quick swap i think as the car ive bought for the engine runs well, i am right in thinking just drop it in and cam shafts gonna be ok