You should read what Kas has to say in his prep manual.. He recommends
port matching.
On Wed, Oct 8, 2014 at 3:57 PM, Dan Cronin <adcronin@mi.rr.com> wrote:
> 10/8
> Thanks to all who took the time to read my query and respond. Very
> interesting variety of thought on wether or not matching the ports is a big
> deal --- or not (as long as the gas / exhaust flows from smaller to larger
> bores).
> Dan
>
> On Oct 7, 2014, at 3:46 PM, Dan <adcronin@gmail.com> 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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