What valve seals do you have on your shovelheads?
#12
Have a look at valve guide seals on this website, he lists all the dimensions for each seal. Look at big lock Chevy seals, 3/8 valve stem.
https://www.alexsparts.com/bb-chevy-...1v-eight-each/
https://www.alexsparts.com/bb-chevy-...1v-eight-each/
#13
Have a look at valve guide seals on this website, he lists all the dimensions for each seal. Look at big lock Chevy seals, 3/8 valve stem.
https://www.alexsparts.com/bb-chevy-...1v-eight-each/
https://www.alexsparts.com/bb-chevy-...1v-eight-each/
great website, all the correct dimensions are indicated
The websites in Italy are not so accurate.....James Valve Guide Seal Kit Harley Davidson Big Twin 1948 – 2004not very accurate
#14
#15
https://www.alexsparts.com/valve-seals-3-8/
And he lists a pair for Shovelheads, although the guide size of the seals is not .625, Have you measured the O.D. of the guides in your heads?
https://www.alexsparts.com/viton-val...airs-vss-266v/
#16
Alez's parts tells me one month for shipping to Italy.
I have found shops in Europe with faster shipping.
I found COMETIC Valve Stem Seal C9424-1 which should be the one you used in fact it is for 1981 models.
COMETIC Valve Stem Seal C9998-1 should be for 1980.The I.D.
it should always be 0.625", I don't know what changes, maybe Overall Height?
Can someone confirm this for me?
I wrote to COMETIC to know the difference between Valve Stem Seal C9424-1 and C9998-1, I'm waiting for the reply.
I have the lower collars available without the first step and also the original and complete ones.
With COMETIC Valve Stem Seal which collars should I fit?
I have found shops in Europe with faster shipping.
I found COMETIC Valve Stem Seal C9424-1 which should be the one you used in fact it is for 1981 models.
COMETIC Valve Stem Seal C9998-1 should be for 1980.The I.D.
it should always be 0.625", I don't know what changes, maybe Overall Height?
Can someone confirm this for me?
I wrote to COMETIC to know the difference between Valve Stem Seal C9424-1 and C9998-1, I'm waiting for the reply.
I have the lower collars available without the first step and also the original and complete ones.
With COMETIC Valve Stem Seal which collars should I fit?
#17
Dennis Kirk gives the dimensions of the C9998-1 seal at the bottom of the pic.
https://www.denniskirk.com/cometic/v...prd/266246.sku
https://www.denniskirk.com/cometic/v...prd/266246.sku
#20
The valve guide O.D. on my heads is the same for intake and exhaust so I use the same seal on both. The Alex guy has seals listed by stem size, 3/8.
https://www.alexsparts.com/valve-seals-3-8/
And he lists a pair for Shovelheads, although the guide size of the seals is not .625, Have you measured the O.D. of the guides in your heads?
https://www.alexsparts.com/viton-val...airs-vss-266v/
https://www.alexsparts.com/valve-seals-3-8/
And he lists a pair for Shovelheads, although the guide size of the seals is not .625, Have you measured the O.D. of the guides in your heads?
https://www.alexsparts.com/viton-val...airs-vss-266v/
the cometic seal is the one to use just use a veneer to check the travel - bottom of the top retainer to the top of the seal installed ( your cam lift is the number ) you must have at least .050 plus your cam lift or the oil will hyd lock on top of the seal and pump oil into the valve guide