greeneyegi
Well-Known Member
- Joined
- Feb 21, 2010
- Messages
- 1,459
Got another tune up 1987 gn, turns into blown head gasket!
Somebody gave bad advice to this guy.
Supposedly the motor was stroked.
Stock 8445 refreshed heads.
4" downpipe
72mm turbo
stock size roller cam,lifters,ta roller rockers.
stock converter
The car wouldnt build boost.
The tps was way off and iac off also.
I told him i would fix that and go from there.
By the time the car came back I did a quick compression check and cyl 3,5 were gone.30 psi
All the other cyl were 180 psi.
After pulling the head to replace gasket,turns out, its got wrong ones installed.The builder used NA head gaskets.
The pistons arent stock.They also dont have any numbers stamped on them? My experience always showed what size the slugs were oversized. Am i correct?Maybe just stock bore?
there is good crosshatch but some real good scratches in cylinders.
Are their oversized, that arent marked on top?
And can i measure the length of cylinder while all the way down to see if it is stock stroke?
I will have alot of questions here,but first is, pistons and if the motor was bored/stroked.
I attached pics of cylinder scratches
and the pistons say "right side" and arrow on them.
Any ideas on pistons?
Going to install a 58mm turbo and put back together and fix all the rigged stuff and bring this beauty back to life.
Somebody gave bad advice to this guy.
Supposedly the motor was stroked.
Stock 8445 refreshed heads.
4" downpipe
72mm turbo
stock size roller cam,lifters,ta roller rockers.
stock converter
The car wouldnt build boost.
The tps was way off and iac off also.
I told him i would fix that and go from there.
By the time the car came back I did a quick compression check and cyl 3,5 were gone.30 psi
All the other cyl were 180 psi.
After pulling the head to replace gasket,turns out, its got wrong ones installed.The builder used NA head gaskets.
The pistons arent stock.They also dont have any numbers stamped on them? My experience always showed what size the slugs were oversized. Am i correct?Maybe just stock bore?
there is good crosshatch but some real good scratches in cylinders.
Are their oversized, that arent marked on top?
And can i measure the length of cylinder while all the way down to see if it is stock stroke?
I will have alot of questions here,but first is, pistons and if the motor was bored/stroked.
I attached pics of cylinder scratches
and the pistons say "right side" and arrow on them.
Any ideas on pistons?
Going to install a 58mm turbo and put back together and fix all the rigged stuff and bring this beauty back to life.
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