the GM pin is very readily available and very well developed for both light
and strong. honing the rods and pistons to the new diameter will not
sacrifice any real strength for an easier to get much more plentiful part.
It is a matter of economics lower cost of manufacture to provide a lower
cost of purchase. The tech term is 'greenbacks' or 'closing the sale'..
there is no other science beyond that. Any real quality move is for the very
few that do not consider Summit and Jegs the last word in racing or use its
catalog as an encyclopedia.. sigh..
----- Original Message -----
From: "Larry Mayfield" <drmayf@mayfco.com>
To: <land-speed@autox.team.net>
Sent: Wednesday, November 23, 2011 12:35 PM
Subject: [Land-speed] dumb Question # 4856 - Wrist pins
> Ford uses a wrist pin diameter of 0.912 inches for the little end of the
> rod/piston. GM has a wrist pin diameter of 0.927 inches. I see a number
> of Ford products whether pistons or rods offered with the option of
> using the GM wrist pin diameter. I don't know if the Ford pin diameter
> is offered as an option for GM stuff though. Don't care, lol...
>
> What's up with that? Is the GM pin lighter even though it is larger in
> diameter? Stronger for sure but is that the reason?
>
> So, the dumb question is: "why switch from 0.912 to 0.927 inch diameter
> wrist pins?
>
> Keep it technical please...
>
> mayf
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