Thread: 4-Tec Valve Guides
10-13-2009, 07:37 AM #1
4-Tec Valve Guides
How difficult is it to change the valve guides in a 4-Tec head?
I am helping to rebuild a head with 300+ hours that has alot of play in the guides.
What do you guys recommend?
10-13-2009, 01:53 PM #2
seems like the manual says to not heat the head and to machine off part of the old guide before pressing it out. there is always a risk of something going wrong when replacing the guides and the head becoming unusable. I've always wondered if you could install thin wall bronze liners in the existing guides instead of replacing them.
10-13-2009, 03:36 PM #3
I guess the best option is a new head, what amount of play is acceptable?
10-13-2009, 04:56 PM #4
I just removed a broken guide, with a round punch, and a hammer. Didn't have to hit it as hard as I expected to either. When u buy new guides, they should be installed by a good engine machine shop, and then reamed out to fit the valve exactly. (they come smaller then the valve o.d.and must be opened for that valve)
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