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23 head work
http://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=63303		 Page 1 of 1
Author:  KAquack [ Wed Aug 19, 2015 10:09 am ]
Post subject:  23 head work
I currently have my motor tore down to replace head gaskets so while I have it down i want to have the heads worked on them but I'm not sure what all I should do to them. I have a makuni on the way and also a mac. The rest is stock. I will eventually add a cam but it will be a while. I have saw where most deck them at .035 and also do a 3 angle valve job. Should I shim the valves springs and get new valve also ? Any suggestions


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Author:  maxus-12 [ Wed Aug 19, 2015 10:55 am ]
Post subject:  23 head work
Deck to your liking, clean up the ports, 3 angle valve job with stainless valves. Shim springs for higher rpm you will be turning


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Author:  SpecialK [ Wed Aug 19, 2015 1:38 pm ]
Post subject:  Re: 23 head work
I would search this forum for people who have decked the heads on this motor in the past. I have no idea what the stock piston to valvle clearances are, but you don't want to over do it and have problems later. YOu may also want to take into account what cam you are going to get later on. It may somewhat dictate how much decking you can do, depending on lift.

I am by no means an expert, but do you due diligence in finding out what your clearances are and will be before and after decking the heads.
Author:  redfish bandit [ Thu Aug 20, 2015 11:56 am ]
Post subject:  Re: 23 head work
I'm in the same boat as you just took heads off and was trying to figure out what would work best. Looks like .030-.040 is common around from what I've researched. I'm doing that with oversized valves and having the valves shimmed and port work on the heads.
Author:  Flounder [ Thu Aug 20, 2015 12:15 pm ]
Post subject:  Re: 23 head work
.035 decked heads with cam should put you at around 160-165 compression. IMO oversized valves offer no real advantage over stock size. light port and polish work softening hard angles and casting marks in the CC and ss valves with a 3 angle valve job is all that is needed
Author:  maxus-12 [ Thu Aug 20, 2015 1:26 pm ]
Post subject:  Re: 23 head work
On the 23 I built up, heads decked .030 it had right at 170 psi compression


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Author:  redfish bandit [ Thu Aug 20, 2015 1:28 pm ]
Post subject:  Re: 23 head work
I thought the only way to get stainless valves was with the oversized? Makes sense if you have a bigger carb and exhaust to go with oversized valves IMO.
Author:  redfish bandit [ Thu Aug 20, 2015 1:29 pm ]
Post subject:  Re: 23 head work
I will keep yall posted on results of what my compression lands at when I get heads back on the motor. should be a few weeks till I get them back.
Author:  cb5331 [ Thu Aug 20, 2015 2:19 pm ]
Post subject:  Re: 23 head work
Author:  redfish bandit [ Thu Aug 20, 2015 6:39 pm ]
Post subject:  Re: 23 head work
Author:  cb5331 [ Thu Aug 20, 2015 6:57 pm ]
Post subject:  Re: 23 head work
Velocity is what's important. That's why it's also a horrible idea to hog out the ports on these engines. Smaller diameter and higher velocity is going to serve you much better in this application.

Valves can be made however you want. Actually seen a smaller valve used before...
Author:  mizzippi jb [ Thu Aug 20, 2015 7:05 pm ]
Post subject:  Re: 23 head work
My buddy had his 23 decked .040, cleaned up the ports and the intake, and swapped to the stainless valves (not oversized) to compliment a mikuni and gutted stock. Seems to be a good recipe for his motor. He has a cam we are gonna install within a couple weeks.
Author:  redfish bandit [ Thu Aug 20, 2015 7:31 pm ]
Post subject:  Re: 23 head work
Author:  cb5331 [ Thu Aug 20, 2015 7:43 pm ]
Post subject:  Re: 23 head work
No, I don't. Not even a briggs anymore. :lol: Actually I still have a few briggs, but they are for sale.. :lol:
Author:  Podcast [ Thu Aug 20, 2015 7:57 pm ]
Post subject:  Re: 23 head work
Author:  KAquack [ Thu Aug 20, 2015 8:24 pm ]
Post subject:  Re: 23 head work
awesome info guys!

I'm hoping to be in the 25 mph range with the mods I got coming
Author:  redfish bandit [ Thu Aug 20, 2015 8:44 pm ]
Post subject:  Re: 23 head work
I'm 23.5mph on 16x40 BPS exhaust,we shall see what it does after rest of the mods
Author:  Will B Free [ Thu Aug 20, 2015 10:02 pm ]
Post subject:  Re: 23 head work
KAquack what size boat you running?
Author:  Podcast [ Fri Aug 21, 2015 8:31 am ]
Post subject:  23 head work


Here's 25 just normal runnin.

What size boat ya runnin OP?
Author:  KAquack [ Fri Aug 21, 2015 10:04 am ]
Post subject:  23 head work
Author:  KAquack [ Fri Aug 21, 2015 10:11 am ]
Post subject:  Re: 23 head work
Podcast what cam are you running?


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Author:  Podcast [ Tue Aug 25, 2015 3:38 pm ]
Post subject:  Re: 23 head work
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