Larry;
You need enough clearance to allow for rod stretch at high RPM. That said, I
don't know what it should be! :)
Regards, Neil Tucson, AZ
--------------------------------------------------
From: "Larry Mayfield" <drmayf@mayfco.com>
Sent: Tuesday, March 15, 2011 9:27 PM
To: <land-speed@autox.team.net>
Subject: [Land-speed] Compression Height, Ford Small Block, Of course...
> Last week I asked about mixing and matching the cranks, pistons and rods
> between a 289 and 302 sized motors. The use of the shorter 302 rod with a
> 289 crank was not deemed to be a good idea because it puts the piston down
> hole 0.065 inches. Seemingly small but apparently important in squish.
> But when I look at a combo made for a particular engine, say the 289,
> virtually everyone of the piston makers use something other than the zero
> deck height compression height of 1.6135 inches. Most sell their pistons
> at 1.60 inches which also puts the piston down hole by 0.0135 inches. Is
> that a significant amount? I did sample a number of products and one was
> 1.608 which is closer.
>
> What's good?
>
> mayf
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