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KAquack
MMT Pro Member
Joined: Thu Aug 07, 2014 6:26 am
Posts: 114
Location: Northeast Alabama
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 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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G3 project boat
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| Wed Aug 19, 2015 10:09 am |
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maxus-12
MMT Member
Joined: Wed Mar 19, 2014 5:56 pm
Posts: 31
Location: Cottage Grove, Minnesota
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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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1754 Prodigy pushed by a level 3 DPE Gen 4 37PD
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| Wed Aug 19, 2015 10:55 am |
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SpecialK
MMT Pro Member
Joined: Sun Jan 15, 2012 7:04 pm
Posts: 249
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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.
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| Wed Aug 19, 2015 1:38 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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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.
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| Thu Aug 20, 2015 11:56 am |
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Flounder
MMT Member
Joined: Tue Aug 11, 2015 2:26 pm
Posts: 27
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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
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| Thu Aug 20, 2015 12:15 pm |
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maxus-12
MMT Member
Joined: Wed Mar 19, 2014 5:56 pm
Posts: 31
Location: Cottage Grove, Minnesota
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Re: 23 head work On the 23 I built up, heads decked .030 it had right at 170 psi compression
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1754 Prodigy pushed by a level 3 DPE Gen 4 37PD
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| Thu Aug 20, 2015 1:26 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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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.
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| Thu Aug 20, 2015 1:28 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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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.
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| Thu Aug 20, 2015 1:29 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: 23 head work
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| Thu Aug 20, 2015 2:19 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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Re: 23 head work
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| Thu Aug 20, 2015 6:39 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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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...
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| Thu Aug 20, 2015 6:57 pm |
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mizzippi jb
MMT Elite Member
Joined: Wed Sep 21, 2011 2:53 pm
Posts: 5077
Location: The duck Mecca called Ga!
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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.
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I've never gone to Seminole for the amenities/luxury the two reasons I go down there are to kill shit and get fucked up with like minded individuals aka OG'S. If you want to swirl wine and stay in a room where politics and investment diversity are discussed (with no roaches) lake lanier is near Atlanta. If you wanna have an awesome time and maybe stay in a room where children were conceived on one side and someone got stabbed over an 8-ball on the other come on down I got a can of raid. 
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| Thu Aug 20, 2015 7:05 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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Re: 23 head work
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| Thu Aug 20, 2015 7:31 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: 23 head work No, I don't. Not even a briggs anymore.  Actually I still have a few briggs, but they are for sale..
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| Thu Aug 20, 2015 7:43 pm |
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Podcast
MMT 1000 Club
Joined: Fri Dec 09, 2011 12:33 pm
Posts: 1363
Location: Friggin cold up here
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Re: 23 head work
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Wildberry "Between You, Will, DUCK HEARSE, and PODCAST I have trouble reading anything on here"
23GTR stage 2 by Calen pushin a 1746 Kliebert
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| Thu Aug 20, 2015 7:57 pm |
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KAquack
MMT Pro Member
Joined: Thu Aug 07, 2014 6:26 am
Posts: 114
Location: Northeast Alabama
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Re: 23 head work awesome info guys!
I'm hoping to be in the 25 mph range with the mods I got coming
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G3 project boat
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| Thu Aug 20, 2015 8:24 pm |
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redfish bandit
MMT Pro Member
Joined: Sun Jun 22, 2014 3:47 pm
Posts: 73
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Re: 23 head work I'm 23.5mph on 16x40 BPS exhaust,we shall see what it does after rest of the mods
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| Thu Aug 20, 2015 8:44 pm |
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Will B Free
MMT Pro Member
Joined: Thu Sep 05, 2013 6:11 pm
Posts: 183
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Re: 23 head work KAquack what size boat you running?
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| Thu Aug 20, 2015 10:02 pm |
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Podcast
MMT 1000 Club
Joined: Fri Dec 09, 2011 12:33 pm
Posts: 1363
Location: Friggin cold up here
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23 head work
Here's 25 just normal runnin.
What size boat ya runnin OP?
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Wildberry "Between You, Will, DUCK HEARSE, and PODCAST I have trouble reading anything on here"
23GTR stage 2 by Calen pushin a 1746 Kliebert
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| Fri Aug 21, 2015 8:31 am |
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KAquack
MMT Pro Member
Joined: Thu Aug 07, 2014 6:26 am
Posts: 114
Location: Northeast Alabama
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23 head work
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G3 project boat
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| Fri Aug 21, 2015 10:04 am |
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KAquack
MMT Pro Member
Joined: Thu Aug 07, 2014 6:26 am
Posts: 114
Location: Northeast Alabama
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Re: 23 head work Podcast what cam are you running?
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G3 project boat
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| Fri Aug 21, 2015 10:11 am |
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Podcast
MMT 1000 Club
Joined: Fri Dec 09, 2011 12:33 pm
Posts: 1363
Location: Friggin cold up here
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Re: 23 head work
_________________
Wildberry "Between You, Will, DUCK HEARSE, and PODCAST I have trouble reading anything on here"
23GTR stage 2 by Calen pushin a 1746 Kliebert
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| Tue Aug 25, 2015 3:38 pm |
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