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sounds about right, always frun trying to get the most out of modifying stock parts. Brings such a smile to ones face when it all comes together

is the stock piston thick enough to cut some reliefs in ?

hmm so if i am aiming for around 9:5:1 compression or 10:1 should i take it down to the first cooling fin ? This engine may end up on a mini but will be in a small one seater go kart first. Just building something for fun but I like maximum performance

I was thinking the same thing, I haven't taken the bottom end apart yet. Then engine came from the fertilizer industry, off of a nitrogen tanker its a little corroded and rusty on the outside but the cylinder looks new.

Shaving .100 off the head would increase my compression from factory to what ? around 9:5:1 10:1 ? also I can't seem to find an aftermarket 340 flat top piston. Should I have it bored out to 390 or will the factory piston work on a billet rod ?

Thanks, I think that would be my best bang for my buck being as im just building this as a fun motor. Some port work, might get .100 shaved off of it if my machinist is willing to give me a fair price.

29 views and no reply ? Any advice would be appreciated guys, have tried the search and there are limited topics on the big block hondas/clones

Are these heads both the same casting? And What size are the stock valves? I have a gx340 thinking of a nice port job and some stainless valves but can't seem to find the stock valve sizes. Thanks T.J.

So is the gx340 head the same as the gx390? and what are the stock valve sizes ? I was thinking of shaving it .100 and a light port and polish with ss valves and heavy duty springs,

Thanks guy's yes I have already read the sticky about engine safety and am fully aware of the danger, I have 2 dirt ovals less than 15min's from me and have seen a few disaster's. Billet flywheel and rod are the first things I'm ordering for the predator. I was thinking shave the head...

First I would like to introduce myself I am T.J. from South Carolina, small town farm kid 25 years of age. Been neck deep in making things go fast and hot rodding all my life... I recently acquired a hemi head predator 60363 part number... tore it down removed all the governor assembly as...