sugarzulu79
New Member
Hi
I have a 1976 Plymouth Volare with a stock 225ci slant six engine and a "not machined" head. I wanted to replace the valve stem seals as the car was smoking bad on start. I bought a set (of 12) of qualcast 38-253-45 viton seal from rockauto which were said to be umbrella type intake and exhaust seals (on rockauto and in qualcast's e-catalog). But they look like positive type seals. See photo:
(the blue one, the black one is the old intake seal just for size comparison - the blue one fits inside of it...)
The old, brittle, hard plastic seals look like umbrella type and the intake (taller) seal has a much bigger base OD (0.9 inch)
I went to install the new viton ones, but while they slid on the stem (3/8") easily, it took a lot of force to make them go on the
valve guide OD (the head is not machined for positive type seals). They seem stretched and they look like they are about to pop off.
Are they installed correctly? Is this how they are supposed to look?
I looked online but couldn't find a modern replacement for intake seals. Fel-pro has the SS12764 exhaust umbrella type set but they don't have anything in their catalogue for intake. I was told that the 318ci V8 set is compatible, so I bought a Fel-pro SS70014 but the intake seals in the package are identical in size to the blue viton ones I bought. The install guide even calls them positive type - I guess the 318ci heads are machined like that out of the factory.
Could someone please recommend a whole set (or just intake set) that I could use? I found an earlier post on here that mentioned Sealed Power Mv-1771 seals (discontinued) which I can only find on ebay. Would they work? At this point, I don't care if they are viton or rubber or polyacrylate.
Kind regards,
Robert
I have a 1976 Plymouth Volare with a stock 225ci slant six engine and a "not machined" head. I wanted to replace the valve stem seals as the car was smoking bad on start. I bought a set (of 12) of qualcast 38-253-45 viton seal from rockauto which were said to be umbrella type intake and exhaust seals (on rockauto and in qualcast's e-catalog). But they look like positive type seals. See photo:
(the blue one, the black one is the old intake seal just for size comparison - the blue one fits inside of it...)
The old, brittle, hard plastic seals look like umbrella type and the intake (taller) seal has a much bigger base OD (0.9 inch)
I went to install the new viton ones, but while they slid on the stem (3/8") easily, it took a lot of force to make them go on the
valve guide OD (the head is not machined for positive type seals). They seem stretched and they look like they are about to pop off.
Are they installed correctly? Is this how they are supposed to look?
I looked online but couldn't find a modern replacement for intake seals. Fel-pro has the SS12764 exhaust umbrella type set but they don't have anything in their catalogue for intake. I was told that the 318ci V8 set is compatible, so I bought a Fel-pro SS70014 but the intake seals in the package are identical in size to the blue viton ones I bought. The install guide even calls them positive type - I guess the 318ci heads are machined like that out of the factory.
Could someone please recommend a whole set (or just intake set) that I could use? I found an earlier post on here that mentioned Sealed Power Mv-1771 seals (discontinued) which I can only find on ebay. Would they work? At this point, I don't care if they are viton or rubber or polyacrylate.
Kind regards,
Robert
