Doug,
As you well know, you can't get too radical with the cam when you use a TBI
unit but all of the cam manufacturers have a good selection of Rv stuff.
Headers were worth 1 MPG, besides the cast iron manifolds were warped and I
didn't feel like machining them again. I used the stock intake manifold with
a spacer from a turbo company, I can't remember their name(CRS has set in).
The company sent me two different thickness' and you have to play with it
but it was worth 1 1/2 MPG. They also sell chips, I used the more radical
one that requires a thermostat change. All in all , I went from 4.5 towing
to 9 plus, 11 to 12 around townwithout the box. This was a crewcab dually
with 4 wheel drive( at least 1500# heavier than the 2 wheel verison,I
guess).
I have changed the 4:11 rear to a 3:73...it was a mistake. The RPM was too
low and it took too much throttle to pull the trailer. I went from 8 MPG to
6. I was pulling a 28FT box that weighted 5800#.
I hope this helps...my two cents!
joe
DOUG ODOM wrote:
> List, Does anybody have a really good cam and intake setup for their
> tow-push truck? I just got an 87 chevy crewcab with a bad motor. I have
> the 350 setup figured out but not the big motor. I have been told that
> the gear ratio in the rear is the biggest help for milage. Anybody ever
> done any testing on that? Any help will be appreciated as I really don't
> have the time to fool around with another motor before Bonneville.
> Doug Odom with another project and no time
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