39 B John Deere

[R Moline]

Just bought a 39 B. Looks like its going to have to go all the way down. While it's apart I thought I might pep it up a little. What are my options. Don't want to go really extreme but would like to have a little more pep for some farm stock classes.

 

[toot]

First of many responses I"m sure.. bore from 4 1/2" to 4 11/16" for a late aluminum b piston, your head will be a flat head on that model, so go with a good multi angle valve job, Get a gas manifold and match port the manifold to head, enlarge valve bowls, clean up rough castings in intake ports. Whenever you get it back running, make sure there are no air cleaner obstructions and you have a good spark from your mag. Cheapest route without going radical on bore or stroke. Will pull good in low gear "farm classes" with that combo. 3000- 3500 lb classes.

 

[jd b puller]

You can bore it, stroke it, rods, cam it, and new pistons for about $2600. Would give you between 45-50 HP with an A carb. Not a monster, but easy to build and respectable HP for a B.

 

[MuddyBoots83]

I would start by restoring the saw on the front... ya know...to CUT DOWN THE COMPETITION!