During a removal of the TR4A exhaust manifold the lower rear stud twisted off in the head.
I drilled the stud out but the easy out just smeared the and nothing came out but shavings.
All of the other studs came out with some lots of WD40 and double nutting.
From the PO this car had a history of blowing out the manifold gasket every 30k-40k miles right next to the broken stud. I am in the middle of the first pass at a mechanical restoration of this vehicle which has not run since 84. The vehicle has 144k miles total and had a lower engine overhaul around 85k miles.
The had a broken valve spring around 50k miles other then that no other mods since new in 67.
This has original valve seats and valves (not modern hardened for unleaded ops).
I have removed the head and handed it over to a machinist who is evaluating the broken stud.
I have not looked at the cam shaft
After the stud issue is resolved we plan fo fit check of the manifolds (without gasket) to see if we need to do some "adjusting" of the rear manifold port.
I plan to replace the manifold gasket with the Moss uprated gasket (695-070).
Questions:
1) Has anyone else had this blowout problem ... what was resolution ?
2) Any recommendations on other upgrades to head while I have it out.
Valves, seats, guides, etc.
3) Are any of the Moss upgrades parts worth the effort (tappets, roller rockers, etc)
4) I see alot of discussion on 3/8 vs 5/16 valves/guides.
I will continue to monitor those threads...
The plan for the car is normal driving with this car and might be a partial daily driver.
However I would like to NOT revisit the head again after everything is together.
I drilled the stud out but the easy out just smeared the and nothing came out but shavings.
All of the other studs came out with some lots of WD40 and double nutting.
From the PO this car had a history of blowing out the manifold gasket every 30k-40k miles right next to the broken stud. I am in the middle of the first pass at a mechanical restoration of this vehicle which has not run since 84. The vehicle has 144k miles total and had a lower engine overhaul around 85k miles.
The had a broken valve spring around 50k miles other then that no other mods since new in 67.
This has original valve seats and valves (not modern hardened for unleaded ops).
I have removed the head and handed it over to a machinist who is evaluating the broken stud.
I have not looked at the cam shaft
After the stud issue is resolved we plan fo fit check of the manifolds (without gasket) to see if we need to do some "adjusting" of the rear manifold port.
I plan to replace the manifold gasket with the Moss uprated gasket (695-070).
Questions:
1) Has anyone else had this blowout problem ... what was resolution ?
2) Any recommendations on other upgrades to head while I have it out.
Valves, seats, guides, etc.
3) Are any of the Moss upgrades parts worth the effort (tappets, roller rockers, etc)
4) I see alot of discussion on 3/8 vs 5/16 valves/guides.
I will continue to monitor those threads...
The plan for the car is normal driving with this car and might be a partial daily driver.
However I would like to NOT revisit the head again after everything is together.