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BN2 miss when hot

To: healeys@autox.team.net
Subject: BN2 miss when hot
From: WAS <Waschu2@charter.net>
Date: Fri, 16 Jun 2006 08:53:04 -0400
Hi Steve,

    If the engine was rebuilt, check for bronze valve guides. I have 
seen  this cause your problems many times over the years. If the guide 
clearance is too tight to the valves stem they will bind when hot.
If using bronze guides the phosphorous bronze guides are much then the 
silicone bronze type. Their clearance needs to be slightly greater then 
the steel guides to start but they wear better. My last problem was an 
MGB that ran great around town but five minutes on the highway and it 
would lose cylinders one at a time, get off the highway and two miles 
down the road it would cool off and be ok again. When I pulled the head 
you could see the score marks on the valve stems. After replacing the 
guides and machining the new ones to slightly larger clearances no more 


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