When I ordered guides from Ken Gillanders at BFE for my 3a head, he
specifically told me not to use seals. As some of you know, Ken has extensive
experience racing these cars, so this advice may apply most to extreme
conditions, but, good to know.
He also said that when the guides are reamed, they should have more clearance
than is found on modern engines. The reason for this is that there is a lot of
mass around the guides, and when the head gets hot the heat is not dissipated
as well as on modern heads. The bores of the guides thus shrinks more than we
are used to nowadays.
Anyway the thing is if you don't specifically mention this to the guide
installer, he may ream according to modern standards and there could be trouble
down the road, especially if you like spending time around the redline. So for
mine, I am prepared to live with a bit of oil consumption.
Jim
www.triumphaddenda.com
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