clearance issues....uhoh!!

Reply Subscribe

Thread Tools

Search this Thread

Oct 6, 2014 | 07:43 AM

metcalfm45

Thread Starter

Registered User

Joined: Aug 2014

Posts: 13

Likes: 0

clearance issues....uhoh!!

I'm having clearance issue with this Gen IV 6.0L motor and the Gen III 5.3L heads. Heads are untouched as far as milling goes. When the heads are set in place the motor turns fine. (No rockers attached) when I put the head bolts in, and run up by hand til they quit turning, the motor won't turn. Acts like the piston is hitting the head. Not a cool situation to have. Any suggestions? Or any experience with this? Any experience with a new Gen swap to replace a Gen III motor?

Oct 6, 2014 | 08:35 AM

KCS

Moderator

iTrader: (20)

Joined: Mar 2005

Posts: 8,859

Likes: 323

From: Conroe, TX

Are the headgaskets on when you do this? If so, what headgaskets are they?

Oct 6, 2014 | 11:24 PM

metcalfm45

Thread Starter

Registered User

Joined: Aug 2014

Posts: 13

Likes: 0

Quote:

Originally Posted by KCS

Are the headgaskets on when you do this? If so, what headgaskets are they?

Yeah they're on. They're stock height felpro gaskets.

Oct 7, 2014 | 06:31 AM

KCS

Moderator

iTrader: (20)

Joined: Mar 2005

Posts: 8,859

Likes: 323

From: Conroe, TX

Quote:

Originally Posted by metcalfm45

Yeah they're on. They're stock height felpro gaskets.

Stock for what engine? The 5.3L gasket will be an issue if that's what you're using.

Oct 7, 2014 | 08:03 PM

metcalfm45

Thread Starter

Registered User

Joined: Aug 2014

Posts: 13

Likes: 0

Quote:

Originally Posted by KCS

Stock for what engine? The 5.3L gasket will be an issue if that's what you're using.

Stock 5.3l I had the gaskets checked onand they all "checked to be the same" 5.3, 6.0, etc. I was going to put some 6.0 gaskets and see what she does.

Oct 7, 2014 | 08:09 PM

KCS

Moderator

iTrader: (20)

Joined: Mar 2005

Posts: 8,859

Likes: 323

From: Conroe, TX

Quote:

Originally Posted by metcalfm45

Stock 5.3l I had the gaskets checked onand they all "checked to be the same" 5.3, 6.0, etc. I was going to put some 6.0 gaskets and see what she does.

Take the head off and look to see if the head gasket bore is smaller than the cylinder bore.

Oct 7, 2014 | 11:39 PM

LLLosingit

TECH Junkie

iTrader: (4)

Joined: Aug 2013

Posts: 3,845

Likes: 487

From: Iowa

Quote:

Originally Posted by KCS

Take the head off and look to see if the head gasket bore is smaller than the cylinder bore.

He had another thread going with the same question and my answer almost mirrors yours, I also think it's the 5.3 gasket on the 6.0 bore that's causing the issue.
https://ls1tech.com/forums/generatio...ggestions.html