TFS A-460 head question
2 posters
Page 1 of 1
TFS A-460 head question
Riddle me this,.......
While I was disassembling my new 18-bolt, TFS A-460 heads today (so I could get them ready for a little pocket porting and a very mild clean up), I noticed something that struck me as very odd. Why did Trick Flow decide to install spring cups & shims ONLY on the intake valves with a smaller ID than the OD on the valve seals?
Now,....
The exhaust valve seals have a smaller OD,......so the cups & shims can be easily removed.
I can't remove the cups & shims on the intake side w/o first removing the valve stem seals.
I don't think it's really a big deal to leave them in place while I do the porting,.......... it's just a little more difficult to keep machining debris out of the area and makes clean up a little harder & more time consuming.
Specs are as follows,......
intake valve stem seal OD - .670
exhaust valve stem seal OD - .630
Cups & Shims ID (hole size) - .640
Does anyone have any idea why these are set up like this?
While I was disassembling my new 18-bolt, TFS A-460 heads today (so I could get them ready for a little pocket porting and a very mild clean up), I noticed something that struck me as very odd. Why did Trick Flow decide to install spring cups & shims ONLY on the intake valves with a smaller ID than the OD on the valve seals?
Now,....
The exhaust valve seals have a smaller OD,......so the cups & shims can be easily removed.
I can't remove the cups & shims on the intake side w/o first removing the valve stem seals.
I don't think it's really a big deal to leave them in place while I do the porting,.......... it's just a little more difficult to keep machining debris out of the area and makes clean up a little harder & more time consuming.
Specs are as follows,......
intake valve stem seal OD - .670
exhaust valve stem seal OD - .630
Cups & Shims ID (hole size) - .640
Does anyone have any idea why these are set up like this?
Copperhead- Posts : 492
Join date : 2009-09-05
Age : 53
Location : Pikeville, KY
Re: TFS A-460 head question
It is usual to have to remove the seals to remove the spring cups. P51/FRPP SCJ/TFS A460 and others.
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum