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Guide clearance

  1. #15
    Senior Member wagspe208's Avatar
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    Good luck. It is easy to hone a taper in guides. Especially solid (thick wall) guides. They are hard as hell to hone. (with stones) They hone beautifully with diamond abrasive. I have 2 grits of diamond for thick wall. But if you don't overstroke enough, or have a taper in the stone... well, tapered guides.
    I was doing a set of big chief heads with new guides and spend the 80 each instead of taking a week to hone them all.
    SOFT MY ASS! HA
    Wags

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  3. #16
    Senior Member ol guy's Avatar
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    Okay here we go on the find! 5 out of 8 exhaust valves had a seize problem at the last 1/2 inch of travel in the bronze-silicone guides. So I honed and pulled the stem seals on the exhaust side only. The intake valves were perfect on both heads so I did a qwik check and reassembled. The only reason I can come up with for the small valve side is lack of lubrication and being the hotter valve. They definetly showed scoreing at both the valve and guide. Just for reference for all that chimed in here. I truly appreciate the input!!!!M

  4. #17
    Senior Member ol guy's Avatar
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    Quote Originally Posted by wagspe208 View Post
    Good luck. It is easy to hone a taper in guides. Especially solid (thick wall) guides. They are hard as hell to hone. (with stones) They hone beautifully with diamond abrasive. I have 2 grits of diamond for thick wall. But if you don't overstroke enough, or have a taper in the stone... well, tapered guides.
    I was doing a set of big chief heads with new guides and spend the 80 each instead of taking a week to hone them all.
    SOFT MY ASS! HA
    Wags
    Yeah wags I agree they didn't give up to easy. With a few qwik strokes with hone it was like tease me some more! So I kicked it up a notch and got my way. I was stroking the damaged area only and got a straight guide. Basically I was taking out the galled area only! M

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  6. #18
    gn7
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    Chances are the guides were reasonably straight to start with, but the galling tightened them up in the area that hangs into the port. Probably a little tight to start with and the galling just tightened them up to the point of sticking.
    We have always ran seals even on the exhaust and never had issues YET!, but I know of plenty that do not run seals on the exhaust and they work just fine, with maybe a little puff on start up from oil running down the stem when shut off. I even seen more than a few blown deals run without intake seals with nothing more than a slight haze at idle.

    Thank goodness you caught it before you knocked a valve head off. Its way to easy to do with sticky exhaust valves.



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  7. #19
    Senior Member ol guy's Avatar
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    At this point gn7 I can deal with alittle smoke on fire up or even a taste at wot. But with the bottom end I am running the last thing I want to do is drop a tulip and kill a cylinder for life. It's all stock below the heads and have this sick desire to see how much I can get out of it before deciding to build a real bottom end for the cam and top end resting there. M

  8. #20
    gn7
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    I couldn't agree more. Of all the possible engine failures, I hate dropped and broken valve heads the most!!!!



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