Posted by James Fuller-Devine on Friday, January 17, 2003 at 7:26PM :
In Reply to: Re: I would expect a guy could easily get 125hp, but posted by Dave Speed on Friday, January 17, 2003 at 6:53PM :
"Dodge Pickups History and Restoration Guide 1918-1971" by Bunn and Brownell? The first recommendation for boosting the flat 6's HP is increased oiling. They recommend increasing the size of the groove in the main bearing shells. They suggest clamping the bearing shells in a 4 jawed lathe chuck by bolting 2 surplus center main caps together. They suggest making the groove in the bearing shell approximately 3 times as wide and twice as deep as cut by the factory. They state that it will now match the diameter of the oil hole on the block. They suggest due to the increased oil volume coming from the larger grooves that you can plug the squirt holes in the rods. The reason being the hole reduces the oil cushion around the bearing..particuarly on the power stroke. Also suggested is to install a new rotor type pump. Putting a 1/4" spacer behind the relief valve spring also increaes pressure. These guys seem to know a bit about boosting flat 6's HP. Hope this helps.
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