Hollow Stem Valves

Jim Hanig · 02-08-2019, 04:17 PM

Quote:

Originally Posted by Mike Pearson

I would be afraid to run hollow stem valves in my engine. I have had issues with the Manley exhaust valves dropping the head off and killing the engine. Now I change the valves every time I freshen the engine if they have around 75 runs on them. Not worth the risk.

Mike how much spring pressure do you run? your scaring me .

Hacksaw · 02-08-2019, 09:26 PM

I know it was a few years ago that Manley had a bad run of valves and the heads were falling off. Had nothing to do with spring pressures.

Mike Pearson · 02-09-2019, 07:08 PM

Quote:

Originally Posted by Jim Hanig

Mike how much spring pressure do you run? your scaring me .

About 320 seat. Comp triples.

JCChildress · 02-11-2019, 11:18 AM

My intake valves weigh 89 grams. Is that comparable ?

02-08-2019, 09:26 PM	#2
Hacksaw Senior Member Join Date: Sep 2016 Posts: 881 Likes: 206 Liked 308 Times in 173 Posts	Re: Hollow Stem Valves I know it was a few years ago that Manley had a bad run of valves and the heads were falling off. Had nothing to do with spring pressures.

02-11-2019, 11:18 AM	#4
JCChildress Member Join Date: Apr 2007 Posts: 196 Likes: 7 Liked 10 Times in 4 Posts	Re: Hollow Stem Valves My intake valves weigh 89 grams. Is that comparable ?