250 Head Gaskets?

[Salty Dog]

Are there more than one thickness of head gasket that can be used on a 93 carbed 250? I have 2 different heads on the motor and port side reads 90psi and starboard reads 80 psi. A thinner gasket might bring it up to 90

Thanks

[boats.net]

No, head gaskets are only available in one thickness.

[Salty Dog]

Thanks for the reply.

Did they make heads with different compression that will fit the 250s? Maybe I just need to replace the starboard head with one like the port side. I'll see if they have different part numbers. I have no idea where the heads came from but neither of the paint matches each other or the block. One could be from an OX66 motor.

[Bay Catt]

Can you give me more spacifics on your engine?

[Salty Dog]

Its a 93 carbed 250 with 2 different heads on it. It runs great but port side reads 10 psi higher than the starboard side

[slim]

yes there were two different heads for that motor but the wrong one would not have clearence between the dome and piston and would make a very loud racket when cranking or running. they have had several different paints and now arent painting at all just a primer coat. so the heads should be the same and your problem could be more like blowby or cylinder scarring.

[Salty Dog]

These heads have been on for years and there are no noises or problems at all. Its hard to believe that all 3 starboard cylinders wore out at the same amount to drop 10 psi. Maybe the port head had been shaved at one times. I should just look for a matched set and bolt them on.

Thanks

[Salty Dog]

both the heads have 61A00 stamped on them. Next to the #6 head bolt there is a circle on each head with this stamped:

00
X99 on the starboard head and


62J
01 on the port head.


Now I'm really comfused

[jb123]

if you think the compression difference is the heads...... swap`em n see.