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- 1st gen/323/GLC Engine and Drivetrain (https://www.mazda3club.com/1st-gen-323-glc-engine-drivetrain-59/)

- - DOHC head on SOHC work? (https://www.mazda3club.com/1st-gen-323-glc-engine-drivetrain-59/dohc-head-sohc-work-1061/)

BPT_Protege

November-28th-2001 12:23 PM

DOHC head on SOHC work?

I have a 91 protege SOHC motor.I was wondering if the DOHC head would fit right on.Anyone know?

AiR_SiK

November-28th-2001 03:30 PM

Yes, they have the same block, but with all the labor involved it'd probably be cheaper just to buy a DOHC motor and install it.

AiR_SiK

November-28th-2001 09:06 PM

Yeah, the compression ratio on the SOHC is 8.9 to 1 and on the DOHC I think it's 9.1 or 9.5, I forget. It's probably just from the heads and not the pistons.

Bizob

December-2nd-2001 02:45 PM

The DOHC head conversion on a 91 SOHC would cost 600$CAN with labour (garage quote). I don't know about all that compression stuff, but the pistons don't need to be changed for the conversion to work. Just the head and the ECU (included in the 600$). I know a guy in MTL that did it. I'm gonna try to get a hold of him to find out more. He did it himself, so he should know better than anyone.:bt:

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