Bob,
Quite right about the spacers causing more misalignment, but in the
Special Tuning booklet the use of spacers is suggested as an alternative
to shortening the pushrods. (MG Technical Literature, L/17, issue 1,
1954.
Stage T.F.2 (1250) for 9.3 compression
"...raised to 9.3 to 1 compression ratio by by removing 1/16 from the
head."
"The finished thickness after machining shoudl be 73.575 mm. This is
the absolute maximum to remove" (this is the answer to John's first
question about minimum head thickness)
and the booklet goes on to say
"(c) To allow for the cylinder head machining it is better to shorten
the push rods 1/16", by drawing off one end in an extractor jig,
machining 1/16" off the tube end, conterboring the tube 1/16" deeper for
the push-rod end to enter, refitting the push-rod end and spot welding
through to retain end.
Alternatively, use four rocker-shaft bracket packing pieces (part No. MG
862/459) to correct rocker adjustment. These are 1/16" mild steel with
three holes to match base of the bracket"
One wonders how many had rocker troubles because of bad information
from the factory itself.
Bob
On Wed, 22 Apr 2009 15:57:34 -0400 "Bob Grunau"
<grunau.garage@sympatico.ca> writes:
> Sorry Dallas, spacers just SCREW UP the geometry of the rockers to
> valve tips. Pushrod or adjusters only have to be shortened to
compensate
> for head milling.
> Bob Grunau
>
> -----Original Message-----
> From: mg-t-bounces@autox.team.net
> [mailto:mg-t-bounces@autox.team.net]On
> Behalf Of Dallas Congleton
> Sent: Wednesday, April 22, 2009 3:15 PM
> To: mg-t@autox.team.net; gunnellj@athenet.net
> Subject: Re: [Mg-t] Fwd: Shaved Head
>
>
> John what was actually done back in the day was to install spacers
> under the rocker arm stands to bring them back up to height for the
push
> rods. The spacers would be the thickness of the amount removed from the
head.
> This restores the geometry of the rocker arm,.
> Dallas
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