[Fot] Intake / Exhaust manifold mating surfaces to head

[Tony Drews]

You're very liable to make things worse by opening up the 
manifold.  Having the manifold port somewhat smaller than the head 
port isn't a big problem.

Tony Drews

At 02:46 PM 10/7/2014, Dan wrote:
>I am preparing my TR4a head to accept the intake and exhaust manifolds and
>there seems to be a rather significant difference in the diameters between the
>intake ports of the head (1-1/2" dia.) and the intake manifold (1-3/8 to
>1-7/16" dia.). In addition, the two mating gaskets I measured come in with a
>dia. of 1-23/32nd, just under 1-3/4".  The literature I have consulted
>recommends that the intake ports of the head and the manifold match up
>perfectly including the dia. of the mating gaskets.  Not so critical on the
>exhaust  as a "notch" to the upside on the exhaust port apparently aids in
>extracting gases.  What have you all found in your engine building
>experiences?  I could carefully enlarge the intake ports to match the head,
>but the remaining intake  (TR4a long runner) shell would need to be a opened
>up around 7/32nds thereby perhaps weakening the runners?  Thoughts?
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