Need more P/V clearance in a BB mopar

Larry Hill · 04-21-2018, 08:15 AM

While you are waiting on next winter find out what is available for gaskets, pistons, rods, and block deck height. In your spare time learn how to juggle. lol

Patric Fox · 04-21-2018, 08:28 AM

The Steel Shim head gaskets for a small block are very hard to find, the Mr. Gasket head gaskets are .028, about as thin as I have found. Might not be able to get the .021 gaskets you mentioned. I was taught not to sink the valves. So I wouldn't personally do that if there was another solution.

Coleydog · 04-21-2018, 12:23 PM

Well Brian looks like we're in the same boat. Someday you and I will get these cars done. Look out world. LOL
I need to get down there a take a look see.
Mike

GTX JOHN · 04-21-2018, 05:16 PM

I am confused.......How can you tell piston to valve clearance BEFORE
you CC Heads and know how much they will be milled. It is not unusually
to mill BB Mopar heads .060 or more to get the correct specs.
Every thousand you mill them bring them closer to piston.
How can you measure accurately piston to valve prior to finishing the heads
that are actually being used on engine

What did I misread on this post?

randy wilson · 04-21-2018, 07:57 PM

Quote:

Originally Posted by GTX JOHN

I am confused.......How can you tell piston to valve clearance BEFORE
you CC Heads and know how much they will be milled. It is not unusually
to mill BB Mopar heads .060 or more to get the correct specs.
Every thousand you mill them bring them closer to piston.
How can you measure accurately piston to valve prior to finishing the heads
that are actually being used on engine

What did I misread on this post?

If you angle mill, it does funny things, and can give you a slight larger valve to piston clearance. I’ve also seen it stay near exactly the same. But beings you have zero valve reliefs, I don’t know how that’ll work.

GallopinGhost · 04-21-2018, 08:21 PM

John,

Maybe I didn't explain very well what I'm doing. The whole purpose of this exercise is to figure out how much to machine the heads. I have a finished block with the crank, 1 rod/piston, cam, head gasket, and a spare assembled head, with valves and rockers, and an adjustable pushrod. I then take P/V measurements. Then measure the valve drop on my spare head, which is the travel of the valve to the head deck. Next I compare the valve drop on my new head at the shop to mine. If the new head had .010" more valve drop, I should have .010" more P/V clearance.

The steel shim gaskets are mopar performance and are available from mancini, for $20/set. Felpro 1009 is what I'll probably use though.

Not angle milling the heads.

GallopinGhost · 04-21-2018, 08:27 PM

I'm enjoying the juggling match now, but then again, I don't have a running engine yet. Lol

Quote:

Originally Posted by Larry Hill

While you are waiting on next winter find out what is available for gaskets, pistons, rods, and block deck height. In your spare time learn how to juggle. lol

04-21-2018, 08:15 AM	#1
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,619 Likes: 1,906 Liked 10,665 Times in 2,213 Posts	Re: Need more P/V clearance in a BB mopar While you are waiting on next winter find out what is available for gaskets, pistons, rods, and block deck height. In your spare time learn how to juggle. lol __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

04-21-2018, 08:28 AM	#2
Patric Fox Member Join Date: Jul 2007 Location: Pottstown,Pa. Posts: 121 Likes: 24 Liked 11 Times in 8 Posts	Re: Need more P/V clearance in a BB mopar The Steel Shim head gaskets for a small block are very hard to find, the Mr. Gasket head gaskets are .028, about as thin as I have found. Might not be able to get the .021 gaskets you mentioned. I was taught not to sink the valves. So I wouldn't personally do that if there was another solution.

04-21-2018, 12:23 PM	#3
Coleydog Senior Member Join Date: Jul 2014 Posts: 569 Likes: 36 Liked 53 Times in 38 Posts	Re: Need more P/V clearance in a BB mopar Well Brian looks like we're in the same boat. Someday you and I will get these cars done. Look out world. LOL I need to get down there a take a look see. Mike

04-21-2018, 05:16 PM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,724 Likes: 2,774 Liked 2,445 Times in 690 Posts	Re: Need more P/V clearance in a BB mopar I am confused.......How can you tell piston to valve clearance BEFORE you CC Heads and know how much they will be milled. It is not unusually to mill BB Mopar heads .060 or more to get the correct specs. Every thousand you mill them bring them closer to piston. How can you measure accurately piston to valve prior to finishing the heads that are actually being used on engine What did I misread on this post? __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 04-21-2018 at 05:19 PM.

04-21-2018, 08:21 PM	#6
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: Need more P/V clearance in a BB mopar John, Maybe I didn't explain very well what I'm doing. The whole purpose of this exercise is to figure out how much to machine the heads. I have a finished block with the crank, 1 rod/piston, cam, head gasket, and a spare assembled head, with valves and rockers, and an adjustable pushrod. I then take P/V measurements. Then measure the valve drop on my spare head, which is the travel of the valve to the head deck. Next I compare the valve drop on my new head at the shop to mine. If the new head had .010" more valve drop, I should have .010" more P/V clearance. The steel shim gaskets are mopar performance and are available from mancini, for $20/set. Felpro 1009 is what I'll probably use though. Not angle milling the heads. __________________ Brian Carpenter Stock 1358