Question for you engine builders out there.

Reply Subscribe

Thread Tools

Search this Thread

Apr 29, 2013 | 07:02 PM

mannyman84

Thread Starter

TECH Enthusiast

iTrader: (2)

Joined: May 2007

Posts: 638

Likes: 2

From: Hawthorne CA

Question for you engine builders out there.

So I bought a bare block and finally received it. My boss was telling me that I need to have the old pistons off this block to match up new pistons. Even though this block is 4.030 bore do I still need the old pistons as reference to get new ones? He said the machine shop told him this.

Apr 29, 2013 | 07:03 PM

mannyman84

Thread Starter

TECH Enthusiast

iTrader: (2)

Joined: May 2007

Posts: 638

Likes: 2

From: Hawthorne CA

And I even mentioned I would need a little bigger pistons and he said it doesn't matter.

Apr 29, 2013 | 07:13 PM

garygnu

TECH Senior Member

Joined: Feb 2009

Posts: 5,445

Likes: 4

you don't need the old pistons for doing a engine build that will have new pistons..are you reusing the rods and crank ?what rotating assembly are you considering ?know what heads and chamber size you will use to get the right pistons to reach the desired static compression .