Xnke Posted December 11, 2008 Share Posted December 11, 2008 Ok, so I just bought a set of new valve guides from a guy on ebay, but he obviously doesn't know the difference between an exhaust and an intake guide. In the L6, does it really make much difference? I know the intakes are externally chamfered, and the exhausts have an internal chamfer, but since it's not uncommon for the exhausts to get cut back to the bosses in ported heads, will it cause a problem? Quote Link to comment Share on other sites More sharing options...
katman Posted December 13, 2008 Share Posted December 13, 2008 Are you implying that you got all of one type, intake or exhaust? The exhaust guide has a 3mm counterbore in the bottom end and a blunt, rounded exterior. The intake has about a 30 degree chamfer on the exterior and nothing but bore on the ID. Both are identical other than that. Valve stem to guid clearance is different intake versus exhaust but it's the valve stem that's different- guide bores are an identical 8.000-8.018mm finished. Don't go overboard on cutting the bottom of the guides back to the port surface- that's mostly mental masturbation and ain't worth the extra wear. But yeah, I suppose you could make intake guides from exhaust guides but I think it'd be tougher going the other way. Quote Link to comment Share on other sites More sharing options...
Xnke Posted December 14, 2008 Author Share Posted December 14, 2008 Actually, I got 9 intake and 3 exhaust. I can cut the counterbore in the lathe, and there is enough room to cut the counterbore. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.