4A block enquiry

**corolla16** · 13-07-2006, 06:35 PM

Does anyone know if the bottom end from say a 85/86 Corolla single cam can be fitted with a twin cam head from an 89 Corolla (both carby engines).
I'm looking for a cheap replacement engine for my '89 Corolla and the earlier models are much easier to find.
Also does anyone know the correct engine name for the 2 engines I mentioned?

**slide86** · 13-07-2006, 07:11 PM

i would search....

4ac is the single cam engine
4afc is the twin cam engine

**joe90** · 13-07-2006, 07:19 PM

4ac + 4afc,you'll need to swap the timing gear off your crank but it should work no probs.There are plenty of 4afc's and 4afe's(efi) at the wreckers I frequent.You should be able to find one.

cheers joe

**30psi 4agte** · 13-07-2006, 09:25 PM

it could be done but by the time you convert it you may end up spending the same if not more money (head gasket etc etc ) than if you just hunt around for a little bit to find what you need.

They can be found !

**timgte** · 15-07-2006, 09:02 AM

To answer your question, YES you can use an earlier block with a twincam head, BUT you have to change the pistons to the twincam ones as the tops are different, and the crank pulley etc.. I have just done it myself. My twincam motor blew the bottom end, so i got a SOHC 4ac for next to nothing and used the block from it. Just had to swap over the internals (get a piston from the wreckers and she runs like a dream now.