My buddy has a 2003 focus with the SPI sohc motor and would like to get some more performance out of it. Lots of parts available for the zetec motor, but not for the SPI. My question: what is part interchangeability between the two engines like? also, are there differences in the intake manifold/throttle body setup between the two engines and could a dohc header be made to fit a sohc cylinder head? Thanks in advance for your advice!
- posted
19 years ago