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

 

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.

 

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.

 

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

 

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

 

Just curious, when you say single groove and tripple groove, you are talking about the groove that the valve locks fit into?

 

Yes..........