Fred's 2375 Rebuild Thread Options

[friethmiller]

[A softball question for the Ninja and/or others]

This is the cam card that came with my 2357 engine, which was originally built by Rimco/Fat (long block) a few years ago. Can someone explain why with an intake/exhaust of 448, the lift was only set to 327 degrees? I'm about to rebuild my motor and a lot of focus will be directed at piston "deck clearance" and the valve train geometry that wasn't set correctly. Thanks.

[technicalninja]

You need to be halfway down the skirt, below the pin bore.

Note: this is a guess on my part. The pistons should have come with a card that states where the measurement is supposed to be taken from.

Pistons are NOT round cylinders. They are more like barrels and have a taper to them.

There can be .020"+ of variation top to bottom.

1/2 the skirt below the oil control ring is very common spot.

I think you'll be at 0.002" and are fine. I'd want .002+ maybe .0025

Edit:
I want to see your micrometer!
.001 mm is .000039"
That is 3 HUNDRED THOUSANDS of an inch!

You've SO blown me away!

It's damn hard to work in tenths!

You're 10X tighter!!!!

NFW! At this small a measurement temperature alone will alter things...

Are you REPEATABLE at the third decimal point?

If you are I want to see your tool!!!!!