Valve replacement

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Feb 2, 2011 | 10:34 PM

cdawley4

Thread Starter

Junior User

Joined: Sep 2004

Posts: 76

Likes: 0

From: McDonough, Georgia

Valve replacement

Hi,

I have been posting on here and just doing some preliminary work before rebuilding my 351M. I just took the valve springs and such off my cylinder head and discovered that there is carbon build-up on the valves. I was wondering if I should reuse the valves with the carbon build-up on them or just replace them. I plan on porting and polishing my heads too. I know that a good set of valves can be had for about $80 for the exhaust and $80 for the intake.

What are your opinions?

Thanks,

Chris

Feb 4, 2011 | 09:53 AM

mark a.

Lead Driver

Joined: Mar 2004

Posts: 8,922

Likes: 152

If they haven't been ground before they should have plenty of stock left on them. A bead blasting will make them look like new.

Feb 4, 2011 | 01:41 PM

mustang81

Laughing Gas

Joined: Jan 2006

Posts: 883

Likes: 7

From: New-brunswick,Canada

multi-groove or single groove ? if it's multi-groove replace them with single groove for a better grip. Just finish to rebuild my head and the multi-groove were so worn that i almost lost 3 valves into the cylinder.

Feb 5, 2011 | 10:49 AM

hollenjoe

Posting Guru

Joined: Jul 2007

Posts: 1,355

Likes: 1

And some stock valves came 2 pieces, i would replace them

Feb 5, 2011 | 12:17 PM

POPAJON

Fleet Mechanic

Joined: Aug 2010

Posts: 1,574

Likes: 6

From: Cranbrook, Ont., Canada

I just redone my heads. I replaced all the valves with single groove valves. 3 angle valve job took out the "bumps" in the exhaust port and opened them up to match the header gasket. I was told to leave the intake side alone, they flow nicely and you need the velocity to help fill the cylinder. I used Crane springs, retainers and valve locks, full roller rockers guide plates and screw in studs ( for a roller cam). Good luck in your build. John