Yellow Bullet Forums banner
1 - 6 of 6 Posts

·
Registered
Joined
·
89 Posts
Discussion Starter · #1 ·
Does anyone use a set of these heads? I have a set and the guides are bad after very little run time. The problem with having Dart replace them is they are 4-5 years old. They have less than 2 hours of run time on them.

How tight should the guides fit around the valves? I have a lot of side play and believe it is to much.
 

·
Premium Member
Joined
·
34,857 Posts
Martin,

The clearance should be about .001 stem to guide. Maybe around another .0005 on the exhaust side for heat. In other words, it should fit not much differently than a piston/pin assembly.... should be relatively slop free if you don't have a gauge.

If you can't measure it you'll just have to use your best judgement. Put a valve in the guide, and see if you can side load the valve at the head, with the top of the stem, and see how it interacts with the seat. If it's scrubbing the seat on one side pretty hard then the guides are out of spec.
 

·
Registered
Joined
·
89 Posts
Discussion Starter · #3 ·
I talked to Dart this morning and they are shipping me some replacement valve guides free of charge. It seems they are I different OD then most and only a few companies carry them.

I finally found something on this motor that didn't cost me anything.
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top