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Re: rockers and pushrods

To: Todd Montgomery <tmontgomery@tds.net>
Subject: Re: rockers and pushrods
From: "Michael D. Porter" <portermd@zianet.com>
Date: Wed, 05 May 2004 02:58:43 -0600
Todd Montgomery wrote:

> Does anyone know of a source for a hardened rocker shaft for a Spitfire
> 1147?  I have needle bearings but I can not run them on a stock shaft.

Can't speak to a hardened shaft, but there is a guy in CA who does a 
pretty good job on the stock shaft. Company name is Rocker Arm 
Specialist. The contact information is in the monster list.

What he does (for a damned good price, I might add) is take the 
stock shaft and rockers and rework them. The stock shaft is checked 
for trueness, oil reliefs ground in the rocker area, then 
hard-chromes the rocker shaft and installs bronze bushes in the 
stock rockers and reams them to fit and radiuses the rocker noses.

Obviously, you need something a bit different than that if you're 
running non-stock rockers. But, you might call him and ask if he can 
grind and chrome your shaft to properly fit your needle-bearing 
rockers. That might be an alternative to finding (or having made) a 
high-hardness rocker shaft.

The only concern I would have about chroming is the depth--too thin 
a layer of chrome might induce some spalling and flaking.

If you can't find anyone supplying hard-surface shafts, you might 
call the guy and explain your needs.

Cheers.

-- 
Michael D. Porter
Roswell, NM

Never let anyone drive you crazy when you know it's within walking 
distance.

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