Looking into doin a head job on my 32 PD. How much should I deck the heads and what is the right amount of valve shim to go along with decking of Heads. Also, 3 angle or 5 angle valve job. Pros/ Cons of each. Port and polish is a no brainer.

.50 to .60 3 on the valves

i go .060, 3-angle valve job, and a light port / polish (just knock the corners out & open up the throat a hair).

Thank guys, Wolf Machine in Prairie du Chien WI will do the work. My best friend is a machinist in the shop. They took over the local engine shop, mostly a consolidation due to Wolfs new facility. Hole job will cost me next to nothing with the good buddy discount.

More importantly than just decking the heads is truing the cc's in the combustion chambers.. They should be within 1-2 cc's.. I've had a set of heads decked .070 and another set down to as little as .015 just to true them up.. My personal belief is not to go over .050 but that's just my opnion..

Good info. Mr. Rail


Btw: have u ever seen a set of (shimmed) stock springs wear out?

Not yet but then again I haven't seen a modded motor go over about 300 hours other than RC's..

mine went 488... mostly stage 1. The last 150 or so it had a cam.

My old motor is their or a little past 300!! Its crawfishing now so we shall see!!

xxx

Those deep swirls are just really rough cuts. When they mill them, its probably from them taking deep passes off the head. In other words, they might have taken 3 passes. Each pass at .020 therefore leaving a rough finish.

In order to not have that happen they just have to have the last pass only removing .005 for a nice surface finish.

Hey DB8 are those some EVT heads? I see the engraving. If so that is some pretty crappy quality coming out of their shop. I agree as well that too much was cut on the last pass.

Those were heads that were done when we first got started. Since then we have new equipment for decking the heads. All of the heads that were done by us were decked on a slight angle to try and help increase the flow. So you will not find a set that are truley flat.

The "deep" groove finish is from the feed speed too fast, and if not using a carbide insert, the radius of the tool cutting point is too sharp. Also note the method of machining was with a lathe due to the cylindral concentric pattern.

The other pictures that illustrates a nice finish, was cut in a mill and the cutting head more than likely a multi tool, due to the "cross hatching" finish.

Note this is my opinion based on the pictures, and being a millwright for 27 years, but by no means a FE!

Correct. New machine we have is a mill.

Lathe

file and sandpaper No really a large lathe.

No JD we use a wire wheel for that. Rods and pistons are exact however the cylinders and cranks are not. Carry on.