23HP Vanguard Build

[Dixon]

Ok I have lurked around this sight for some time own a couple of golf carts with vanguard power and always on the look out for 6x6 or 8x8 if the right deal comes by me. But here is my current project I found a deal on a new in the box 23HP motor I decided I would want more power from it as I have the 18hp in the cart now with the heads cut down, slight porting, Rev kit, PVT cam, 2 barrel carb on it now. So on this new motor I bought the intec flat top pistons, cheetah cam, ported the heads, Cromwell carb, ARC rods stock length, ec carbs dual valve springs, PVT SS valves, so far I think that is it.

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[Mike]

Nice work. What kind of HP do you think you'll end up making?

[Dixon]

Not sure I would hope 30hp is obtainable.

[Dixon]

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Here are the heads I ported for this motor.
I also bought the old style heads and was thinking of taking the rockers and retro fitting them to the newer heads but I for the life of me can not come up with a spare set in case I ever break one.

[Dixon]

I am kind of at a stop with these trying to find someone to cut the valve guides for clearance but I want to retain the intake valve seal. Any one have any idea of a cutter I can buy to do this with? My dimensions are Valve stem is .235 or 6mm for the guide, Valve guide outside dimension is .490 and the outside portion of the aluminum boss that surrounds the guide is .600 Any help much appreciated.

[Nubs]

Most porting/head work is easier with the valve guide removed, end mill the casting boss down to were you want. install the guide and mill for retainer clearance, ream guide and cut the seats in.

[Dixon]

Thanks Nubs after looking if I tap the guide down till it is flush in the head then I can cut the boss and guide at the same time then push the guide back up until I have the desired height. Does that sound ok and should I use some green loctight on the guide ?

[Nubs]

That could be done seeing that there new heads, using a press would be better then pounding them back and forth with those brigg's install drivers etc.
using Loctite can't hurt but will do little since the guide is only moving a small amount in my opinion

[Dixon]

Ok thanks Nubs will do. On valve job do you ever put a 30deg back cut on the intake valves? Sorry for all the ?s but it looks like you know these things pretty well by looking at your builds.

[Dixon]

Thanks Nubs got it done.

[Dixon]

I could use a little more guidance rods only came in with .001 clearance ARC says to hand polish the crank to obtain the extra .015 clearance. Any idea I do not want to take the crank out of round this is a brand new never ran crankshaft.

[Nubs]

It has to be done with a crank polisher in my opinion, most any machine shop will have a hand held belt polisher. chuck it in the lathe with low rpm's and your good

[Dixon]

I talked to the machine shop I use but he is not certain about being able to do it with out seeing the crank. I also know he does not own a bore gage below 2''. He does not do any small motor work but does all my performance and stock outboard or I/O boat work for me.

[Dixon]

My measurements cam from using plasti gauge

[Nubs]

plasti gauge is a crap shoot, if the rod moves at all when torquing or the bearing shell is not a 100% seated it'll be off.