BB Chev valve stem seal question....

MAURICE BLENDHEIM · 08-08-2012, 12:29 AM

Grant... I have used the small block o-rings on several different applications and found they work. Had situations with smokey start ups and they were enough to eliminate the problem.

BillK · 08-08-2012, 07:21 AM

Grant,
The Pioneer OS450's I have measure about .720" so they should be ok. Another possibility I thought about this morning is the plastic umbrellas that were used on some of the mid to late 80's 350's that had 3/8" exhaust valve stems. Not sure of the size on those. They are a hard plastic and would not move around as much. Fel Pro number is SS72525 for 8.

Grant Eldridge · 08-08-2012, 09:40 PM

Thanks for all the help, Guys! I'll likely either go with the OS 450's, or the small block o rings. The ports are dry light grey, no sign of oil but just trying to be cautious while I've got the opportunity and the race springs are off. I'm using light ones to break in a new cam. Good time to add a bit better seal for now, then will machine the bosses next time the heads are off the engine.

08-08-2012, 12:29 AM	#1
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 567 Likes: 306 Liked 280 Times in 86 Posts	Re: BB Chev valve stem seal question.... Grant... I have used the small block o-rings on several different applications and found they work. Had situations with smokey start ups and they were enough to eliminate the problem.

08-08-2012, 07:21 AM	#2
BillK Member Join Date: Nov 2005 Location: Waldorf Md Posts: 230 Likes: 12 Liked 30 Times in 17 Posts	Re: BB Chev valve stem seal question.... Grant, The Pioneer OS450's I have measure about .720" so they should be ok. Another possibility I thought about this morning is the plastic umbrellas that were used on some of the mid to late 80's 350's that had 3/8" exhaust valve stems. Not sure of the size on those. They are a hard plastic and would not move around as much. Fel Pro number is SS72525 for 8. __________________ Bill Koustenis

08-08-2012, 09:40 PM	#3
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: BB Chev valve stem seal question.... Thanks for all the help, Guys! I'll likely either go with the OS 450's, or the small block o rings. The ports are dry light grey, no sign of oil but just trying to be cautious while I've got the opportunity and the race springs are off. I'm using light ones to break in a new cam. Good time to add a bit better seal for now, then will machine the bosses next time the heads are off the engine.