I've been curious about this also. When I rebuilt my engine I had a
head that was only a few months old that had seals on the intake and
exhaust valves. When I ran the engine with this head everything was
just fine. I had purchased that head from VB when I was hoping to
weasel my way out of a complete rebuild.
After I finished the engine and got the car back on the road, I took
an old head to the machine shop and had the head magnafluxed, decked,
and new guides, valves, and seats installed to make it a lead free
head. The mechanic insisted that I only needed seals on the intake
valves. When I put that head on the car I started getting that lovely
burning oil in the exhaust immediately. It has never really gotten
any better.
As I mentioned before this was a totally rebuilt engine, new pistons,
rings, bearings, machining, etc. Could the lack of seals on the
exhaust valves be the source of the smoke?
I'd be interested in hearing others opinions on this. I've been
meaning to pull the head to put new seals on the exhaust valves but
I've been having too much fun driving the car to take the time.
I used a new copper competition head gasket on both heads. The shop
that did the machining came highly recommended by members of the
local MG club, so I trust that they did a proper job.
Thanks,
Robert Weeks
1969 MG Midget
http://www.woozy.com/midget
>Bill,
>That 1316 head is just a standard 1275 head with single valve springs.
>I always put seals on all valves
>when I do them. If you use dual springs be sure to use the attendant
>hardware that goes with them and be sure that the seals fit within the
>inner spring and do not rub.
>Brad
>
>
>
>----- Original Message -----
>From: "Bill Mantz" <bmantz@infi.net>
>To: <spridgets@autox.team.net>
>Sent: Tuesday, October 17, 2000 5:07 PM
>Subject: Valve seals
>
>
>1275 Engine-Head Casting #12G1316 (Doesn't seem to match anything in
>Vizard's book) When I took it apart, it had seals on intake and
>exhaust
>valves. I have been told by several people that the seals are required
>on intake only. I have noticed the guides for the intake are slightly
>beveled, making them more receptive to the installation of seals. What
>gives? Intake and exhaust or intake only?
>
>Bill Mantz
>Roanoke, Va.
>1971 Midget (soon to be daily driver)
>1959 Bugeye ( still in pieces)
>Other stuff (autos)
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