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Triumph TR6 - Quick way to ID late vs early head

I'm looking at getting a cyl head for a 74 short block I've got built. I need to know how to tell the differance between an new and old head aty a glance.
JT White

Early head intake ports are .563" (approx. 9/16")measured between intake ports.
Late head intake ports are .875" (7/8").
Needless to say, the intake manifolds and gaskets are not interchangable.
Berry
BTP Price

Thanks BTP....I guess my next question is how do I verify the block I have is the later.....it came out of a 74 donor car BUT that is no guarantee it's a 74 block.
JT White

Jim-The later block will have recesses around the top of the bores, unless they have milled off. Also, a check of the comm. # on the block will verify. I don't have a catlog handy, but TRF or Moss will have # by year. Either head can be used with either block with the appropriate head gasket.
Berry
BTP Price

Now comes the fun part. I've confirmed I have a 74 Block and I also have a 74 and up head gasket BUT there seems to be some holes in the block that aren't on the head gasket???
JT White

Jim-I think that is normal, maybe someone else can verify.
Berry
BTP Price

Yes I've changed the H gasket recently on a 76 and this is what I saw too.
Kypros Christodoulides

I can accept this as "normal" but the question is why on earth would there be holes in the block that serve no purpose in their relation to the head?
JT White

This thread was discussed between 29/08/2012 and 30/08/2012

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