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Re: [Mgs] setting valves after head machining / 1500 MGA

To: Paul Hunt <paul.hunt1@blueyonder.co.uk>
Subject: Re: [Mgs] setting valves after head machining / 1500 MGA
From: The Roxter <rocknatural@gmail.com>
Date: Tue, 14 Jul 2009 19:28:02 -0500
Paul Hunt wrote:
> They were to put a bit of bending torque on the rocker shaft to stop it
> twisting in use, and were only under the middle two pedestals of MGBs as a
> modification.  Someone must have taken a lot of material off the head and/or
> block for you to run out of adjustment if the valve seats aren't recessed,
> shimming the rockers would only put those back to where they were so I can't
> see a problem with that if it is the cause.  But whose to say the 'redoer'
> didn't recut the valve seats as well which would add to the issue?  Are you
> sure you have the right cam followers and push-rods?  Are they correctly
> seated?
Just a word of warning here. I once bought a cylinder head off eBay for my 67 
Cooper S. Just a few miles down the road, I seriously holed a piston, totally 
ruining it and requiring an engine-out rebuild. Turned out the head had been 
decked radically and the compression ratio was over 14 to one. I fixed it by 
paying a racing shop to grind out the combustion areas on the head so the ratio 
was 10 to one and by replacing the ruined piston. That was an expensive lesson.

-The Roxter
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