Hey Guest!
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
re>67 TR4a IRS
re> car has history of blowing out exhaust gasket 40k miles or so.
This vehicle has a total of 144k miles and had a major top and bottom rework at 80k.
Again it has had a history of exh manifold gasket blowouts every 35-40k miles.
The head and exh manifold were handed over to a machine shop for an alignment check.
Head manifold and block side were within 1.5mil of perfectly flat.
Manifold rear and front ports were 6 and 21 mil shorter (toward head) than the center ports (spec is < 4mil)
We are pretty sure this was the source of the exh manifold gasket blowouts.
Getting new (hardened) valve seats and should be as good as new in a week or so.
Valves were replaced 38k miles ago and still looked like new while the original seats were very recessed.
re> car has history of blowing out exhaust gasket 40k miles or so.
This vehicle has a total of 144k miles and had a major top and bottom rework at 80k.
Again it has had a history of exh manifold gasket blowouts every 35-40k miles.
The head and exh manifold were handed over to a machine shop for an alignment check.
Head manifold and block side were within 1.5mil of perfectly flat.
Manifold rear and front ports were 6 and 21 mil shorter (toward head) than the center ports (spec is < 4mil)
We are pretty sure this was the source of the exh manifold gasket blowouts.
Getting new (hardened) valve seats and should be as good as new in a week or so.
Valves were replaced 38k miles ago and still looked like new while the original seats were very recessed.
