Author Topic: 28 ohv head  (Read 399 times)

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Offline Limodriver

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28 ohv head
« on: October 04, 2017, 07:32:44 PM »
How much can i shave off the head of my stock ohv without getting into trouble?



Offline Mower Maniac

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Re: 28 ohv head
« Reply #1 on: October 04, 2017, 07:57:03 PM »
Get the rod that will get you to deck height, and probably around .100"
AZLMRA
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2017-GPK 2nd place

Offline Limodriver

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Re: 28 ohv head
« Reply #2 on: October 04, 2017, 08:03:41 PM »
If i dont get the rod,would 0.050 work?


Offline Mower Maniac

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Re: 28 ohv head
« Reply #3 on: October 04, 2017, 08:07:04 PM »
Oh. If you are gonna do that then use a copper head gasket from copper gaskets unlimited. Lan Vasconti can make one that is .016 thick, and whatever bore you need. Spend the money to o ring the head, and you will probably gain more compression.
AZLMRA
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2017-GPK 2nd place

Offline Limodriver

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Re: 28 ohv head
« Reply #4 on: October 04, 2017, 09:37:09 PM »
Is it mandaory to oring the head with the use of copper head gasket?

Offline Mower Maniac

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Re: 28 ohv head
« Reply #5 on: October 04, 2017, 10:04:22 PM »
Not mandatory but very very very highly advised. An o ring really isnt that much, and if you can get the machine shop to sponsor you, you could probably get it very cheap.
AZLMRA
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2017-GPK 2nd place

Offline Mower Maniac

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Re: 28 ohv head
« Reply #6 on: October 04, 2017, 10:06:28 PM »
On eBay you can use the briggs head gasket replacememt number, and it will show up. When you order it, send him a message, saying you want a 3.44 bore, and .016 thick.
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place


Offline Limodriver

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Re: 28 ohv head
« Reply #7 on: October 05, 2017, 07:56:33 AM »
On eBay you can use the briggs head gasket replacememt number, and it will show up. When you order it, send him a message, saying you want a 3.44 bore, and .016 thick.



do you mean to just go for a thinner head gasket instead of machining the head?

Offline Mower Maniac

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Re: 28 ohv head
« Reply #8 on: October 05, 2017, 08:43:09 AM »
Yeah. It will be cheaper, and should be better or same compression ratio. You could shave the head and use the copper head gasket too.
AZLMRA
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2017-GPK 2nd place

Offline PJG56

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Re: 28 ohv head
« Reply #9 on: October 05, 2017, 03:09:03 PM »
How much can i shave off the head of my stock ohv without getting into trouble?

If your going to run a stock cam you wont gain much from shaving the head,if you shaved it .100,i doubt you would really see enough difference to bother doing it
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)

Offline Mower Maniac

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Re: 28 ohv head
« Reply #10 on: October 05, 2017, 09:05:00 PM »
What are you trying to accomplish with your motor?
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

Offline Limodriver

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Re: 28 ohv head
« Reply #11 on: October 07, 2017, 10:00:48 PM »
Im racing a little,just wanted a little more power. Im planning to port and shave the head,add washers to stiffen the valve springs,straight exhaust,stock carb but with a big air filter. I dont want to spend big money on an engine as im not racing often

I run av gas

Offline Mower Maniac

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Re: 28 ohv head
« Reply #12 on: October 08, 2017, 02:02:35 PM »
If no governor, aluminum flywheel, and rod is a really good idea
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

 

anything