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]

Are the pistons true flat tops with no valve depressions?

I actually prefer that style but on a monster like that I'd have expected valve cuts (little half circles) to be mandatory.

Depending on the cam choice you MAY have to add them.

True flat tops can be MUCH more critical regarding valve clearance.

Claying and checking clearance is a REQUIREMENT!

I'd measure cam base circle NOW as well. Avoid any of the lobe with a dial caliper.

You'll be under an inch now.

If I had your motor, I'd stay T4 on my 75...

[friethmiller]

Are the pistons true flat tops with no valve depressions?

I actually prefer that style but on a monster like that I'd have expected valve cuts (little half circles) to be mandatory.

Depending on the cam choice you MAY have to add them.

True flat tops can be MUCH more critical regarding valve clearance.

Claying and checking clearance is a REQUIREMENT!

I'd measure cam base circle NOW as well. Avoid any of the lobe with a dial caliper.

You'll be under an inch now.

If I had your motor, I'd stay T4 on my 75...

They're flat-top pistons. I'll see about measuring cam circle.