[ihc] Intake manifolds

["Ed Sohm" <idaemes@xxxxxxxxxx>]

Guys,  

I'm having a weak brain moment for some reason.  I have a 345 in my
Travelette that I have never been able to get to run as well as other IH
motors.  It always feels choked or something.  Based on how it is set
up, it should be a runner. It has an Edelbrock 1405 (stock out of the
box)  on a 1" phenolic spacer on top of a square bore manifold.
Pertronix in a Holley Points distributor, matching Pertronix coil, Bosch
platinums gapped at stock gap, 7mm napa wires.  8 degrees BTDC with a
functioning vac advance. Rear dump manifolds, 2 1/4" exhaust to turbo
mufflers, then 2 1/2" tailpipes.  727 and 4:10 gears, LT 265/75R16
tires. Vacuum at about 18mm/hg.  

Everything should be pretty well balanced, big enough motor, good gears,
reasonable tires. It isn't that heavy. Why is it poochy?  

Kickdown linkage was a pain, but I have it set pretty well now.  

I've tried tweaking most every setting, but it has been a while.  I've
got a couple 304s and a 266 that will run circles around this truck, of
course they are in Scouts. 


I got thinking today that my problem may be the intake manifold.  It
came off of an IC 392.  I went to the FAQ and it seems as though this is
not a problem, but something in the back of my mind doesn't agree.

This motor has supposedly about 20K since a rebuild.  The pickup I took
it out of was set up to run on either LPG or Gasoline.  LPG would want
more compression, right?  It doesn't seem to be pinging.  The plugs read
a little rich.

I want to punch it listen to the exhaust cackle and the rocks fly.  It
won't do that.  A heavy trailer and a hill and I start losing rpms.
Even when it kicks down, it doesn't scream and dig in.  


What am I missing?

Ed Sohm
Battle Creek, IA 

'71 800 B
'74 200 4X4 Travelette Camper Special
+ a bunch more