[Fot] Intake / Exhaust manifold mating surfaces to head---THANKS

[Dan Cronin]

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 at 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?
_______________________________________________
fot at autox.team.net

http://www.fot-racing.com

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/adcronin@mi.rr.com