Headgasket and bolt question

[brummy]

This weekend I picked up a 1985 Plymouth Horizon in need of a headgasket. No signs of cross-contamination in the oil, but its pushing pressure into the radiator. Unscrew the radiator cap and it puffs.

I remembered I have a set of headbolts and a headgasket for a 91 Daytona I never used. The headgasket is for a cross-drilled block and cylinder head. Im fairly certain the Horizon isnt cross-drilled. Can I safely get away with using a cross-drilled head-gasket on a non cross-drilled engine?

About the headbolts, the car was manufactured in Oct. 1984, this means it has 10mm headbolts instead of the 11mm headbolts on the 91 Daytona, correct?

[allmotor]

pre 1986 engines have 10mm head bolts. the head gasket really doesn't matter. All I have in my inventory is cross drilled gaskets which I use on everything so that isn't a factor.

[brummy]

Thank you for the confirmation. Now I just need to get myself motivated to start tearing it apart.

[allmotor]

and if you actually decide to do the work, don't use the 11mm head bolt torque specs. you'll break the head bolts.

[itoktoeatfish]

I believe the change over was mid-85, my 85 gts had 11mm head bolts. It was turbo tho, they may have switched the turbo cars first. Only one way to find out for sure.

[allmotor]

It was actually a late 1985 model year change. (pretty rare but does exsist), but then we are also talking about 20+ year old cars, chances are even better that someone did an engine swap