Question on rebuilt head

[Jon K]

You will have absolutely no problems.

The issue you read about regarding raised compression is that if they have to mill the head flat, they are removing material bringing the squish area down and the compression up. Stock head gasket is 0.070" thick - if you remove material, you need to compensate with a thicker head gasket. I'd say do the valve replacement yourself but between lapping the valves and requiring a somewhat specific dual valve spring compressor for your '92, i would just let a shop handle it. Explain to them your concern about remove material to flat and potentially raising compression and they should be understanding and make sure to remove none or minimal.

SHOULD they have to remove headgasket material, I can point you to MLS (multi layered steel) headgaskets that are more targeted for performance in mind, but happen to come in various thicknesses for the M50 motor to compensate for any slight raise in compression.

[Booster]

You will have absolutely no problems.

The issue you read about regarding raised compression is that if they have to mill the head flat, they are removing material bringing the squish area down and the compression up. Stock head gasket is 0.070" thick - if you remove material, you need to compensate with a thicker head gasket. I'd say do the valve replacement yourself but between lapping the valves and requiring a somewhat specific dual valve spring compressor for your '92, i would just let a shop handle it. Explain to them your concern about remove material to flat and potentially raising compression and they should be understanding and make sure to remove none or minimal.

SHOULD they have to remove headgasket material, I can point you to MLS (multi layered steel) headgaskets that are more targeted for performance in mind, but happen to come in various thicknesses for the M50 motor to compensate for any slight raise in compression.

Speaking of this Jon.....which MHG thickness did you decide to go with on your new build ?
..........Vinny