group 'a' headgasket question.
Turbo Mini Forums

hi ive been given a group 'a' headgasket for my turbo engine but the guy i got it off told me that i needed to get some machining done to something in order to fit it, does anyone have any info on this?

Bwaarrrrp, tsch.

i personally wouldnt bother, you do need to do some machining and for what gain? the Payen AF470 or BK430 work fine and only really fail due to wrong ignition, wrong fueling, poor fitment or twisted head/block ( i supose putting a conrod through the head gasket also counts as a gasket failure but i think in that instance you wont be that worried by the gasket failure)

assuming your head and block are flat and you fit a normal gasket then the reasons for failure (ignition and fueling) also have a tendancy to melt pistons, i've melted both gaskets and pistons and feel that the gasket gives way just before the pistons.

if the group A gasket is stronger than the standard one will that meen the pistons will fail before the gasket? personnally i find a head gasket can be changed at the side of the road and cost about £10 as opposed to changing a £400 set of pistons and still needing to take the head off

yup, dont bother, not worth the hassle as a af470 or bk450 does the job

There must be only a very cery small percentage of people running this gasket, and thats not to say they're the most power engines either.