cam lift 390 fe block

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Feb 19, 2008 | 06:47 PM

390hipo

Thread Starter

Joined: Feb 2008

Posts: 2

From:

cam lift 390 fe block

Im taking out a .548 lift hydraulic cam, and I want to go with a .560 solid lift cam. I run stock steel heads and will upgrade the valve springs accordingly. Is the .560 to big? will I run the chance of a valve hitting a piston? Any old school FE big block guy's who can give good solid advice? Thank you

Feb 21, 2008 | 06:08 AM

jlaurens06gt

2nd Gear Member

Joined: Mar 2007

Posts: 408

From: Greater Philadelphia area

RE: cam lift 390 fe block

welcome to the forums, bro!

Feb 22, 2008 | 02:07 PM

Jay Allen

Joined: Feb 2008

Posts: 11

From:

RE: cam lift 390 fe block

Quote:

ORIGINAL: 390hipo

Im taking out a .548 lift hydraulic cam, and I want to go with a .560 solid lift cam. I run stock steel heads and will upgrade the valve springs accordingly. Is the .560 to big? will I run the chance of a valve hitting a piston? Any old school FE big block guy's who can give good solid advice? Thank you

P-V clearance has nothing to do with gross valve lift. When the valve is fully opened, the piston is any where from 106* to 112* (hence inches) down the bore. Plus, a .560" lift SFT is gross lift. Take the .014" to .024" of lash out and you'll less net lift than what you had.

Good Luck.