Re: IH 1100D pickup

Posted by Bob M on September 22, 2004 at 10:29:20 from (165.170.128.65):

In Reply to: IH 1100D pickup posted by Toby Harter on September 21, 2004 at 18:57:30:

Toby � The IHC 304 V8 of that era was notoriously cold blooded! Was due primarily to the excessively lean calibration of the 2 bbl Holley carb � I suspect as a quick and cheap way for IHC engineers to meet emission requirements at the time. Anyway we struggled with a balky �68 304 for many years. A few things we found that helped:

Keep the ignition system in top condition. Run a larger plug gap than spec (.040 or more). An aftermarket CD ignition kit helped in this regard.

Rejet the carb to permit a richer idle mixture adjustment (involves manually reworking the idle metering jets to enlarge the orifice openings several thousandths � not for the faint of heart!) We also rejetted the high speed circuit with larger orifices obtained from a carb rebuilder. The penalty is a slight reduction of the already poor gas mileage.

Modify the carb accelerator pump linkage to increase it�s stroke (to increase the volume of gas shot in as the throttle is opened).

Switch to a smaller PCV valve to reduce PCV airflow dilution in the manifold. I recall we adapted a PCV valve from a Chrysler 225 slant six.

Install the hottest thermostat you can find � 192 deg if possible. Run a winter front whenever the temp drops below about 50 deg. Trick is to get the engine as warm as possible as fast a possible.

Good luck � aside from the factory carburetion the 304 is a great engine!

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