GS1000 79 Head on 80 Engine OK?

[Guest]

Hello all,

A while back I posted a thread about scored cam bearings on my GS1000. I've since sourced a replacement head and have been working on it...lapping the valves and installing new valve guide seals.
But now that I'm looking at it more closely it seems to be missing one of the bolt holes that is on the bike I have. In looking at the parts fisches for 1979 and 1980 GS1000's the 80 has an extra bolt hole between cylinders 2 and 3 on the edge of the exhaust side in front of the cam chain area, the 79 does not have this bolt.

Soooo, can I use the head without the extra bolt hole on this bike, or have I spent a lot of time on a head that I can't use?

Thanks.

[Nessism]

Yes, you can use it. The early head has smaller intake ports though, so if your bike has CV carbs the boots won't bolt up.

[Steve]

As Ed says, yes, you can use it, but that is not all that you will need to change.

.

[RobertGS]

I think the carbs are VM but I'll double check that the boots fit.

I have the matching cams, cam cover etc... Can you let me know what else I'll need to change?

Thanks.

[Bandrews5800]

(I think my variation of this question is answered, but)....I have a "new to me" 1978 GS1000, and from what I can tell there is 1980's+ cylinder installed. There is a tab on the cylinder that should have a mating tab on the head, and a bolt connecting the two. I also have what seems to be the original 1978 cylinder, no tab. I was told that the motor was basically ready to go (I have no reason to doubt the seller, being an experienced builder, but maybe not Suzuki...).

If you can put a 1978 head on a 1980 GS1000, assume (risky) that you can take an 1980 GS1000 cylinder and insert it into a 1978 GS1000 motor?cyl head mismatch.jpg

[Nessism]

The tabs in the front are a "nice to have". Not required. Just make sure to use OEM Suzuki gaskets. Not some crappy aftermarket gaskets prone to leaking. Those screws in the front are there to provide a little extra leakage protection is all.