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  #1  
Old 01-24-2018, 03:41 PM
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austin8214 austin8214 is offline
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Default K321 marked as K301

Right now I have what I assumed was a k321 block with the 1.380 exhaust valve in it. Today I was assembling it and noticed that the block had K301 cast in it. Has anyone else here seen this? I'm kinda wondering now if someone installed a larger valve in a K301 and bored it to 3.500.
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Old 01-24-2018, 06:00 PM
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Did you get from a cheating puller that got busted? LOL.
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Old 01-24-2018, 06:16 PM
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A machinist once told me he used to bore K301 blocks to 3.50" all the time, and increase the exhaust valve size as well; mainly for pulling. He said it used to be a fairly common thing to do...
I have never seen it done but my experience is limited.
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Old 01-24-2018, 08:18 PM
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austin8214 austin8214 is offline
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Did you get from a cheating puller that got busted? LOL.
That's kinda what I'm thinking.
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Old 01-24-2018, 08:22 PM
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Originally Posted by cadetmike View Post
A machinist once told me he used to bore K301 blocks to 3.50" all the time, and increase the exhaust valve size as well; mainly for pulling. He said it used to be a fairly common thing to do...
I have never seen it done but my experience is limited.
My thought is if this is what was done it was a lot of work for no gain at all. Installing the bigger exhaust valve doesn't do much good.
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Old 01-24-2018, 09:06 PM
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Originally Posted by austin8214 View Post
My thought is if this is what was done it was a lot of work for no gain at all. Installing the bigger exhaust valve doesn't do much good.
Yeah I would agree but some seem to think it does... maybe with a hopped up cam it would add some benefit..??

anyway it is an odd thing to find for sure!
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Old 01-24-2018, 10:19 PM
J-Mech J-Mech is offline
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Yeah I would agree but some seem to think it does... maybe with a hopped up cam it would add some benefit..??

anyway it is an odd thing to find for sure!

Those who don't know I guess....

And I think the guy who told you that he used to bore 301 blocks to 3.5" was FOS. They aren't cast heavy enough to do it and hold, if you don't punch through. He was likely boring the 341 block. That one you can. Only some of the 241 blocks can be bored to a 301.




Austin,
I'd say you found a block that someone bored and put a bigger valve in. Kohler did have K241 blocks that were marked as 301's, but not 321's marked as 301's. Not unless you got a factory screw up. Only way to know for sure if measure the cylinder thickness between the fins and see. I would definitely check it before I'd use it. Otherwise, it may break the jug off at the top of the block. Better safe than sorry. $$$$
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Old 01-24-2018, 11:48 PM
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Those who don't know I guess....

And I think the guy who told you that he used to bore 301 blocks to 3.5" was FOS. They aren't cast heavy enough to do it and hold, if you don't punch through. He was likely boring the 341 block. That one you can. Only some of the 241 blocks can be bored to a 301.

That's the next step. Going to check cylinder wall thickness. If over .070 I'm going to head strap it and send it!


Austin,
I'd say you found a block that someone bored and put a bigger valve in. Kohler did have K241 blocks that were marked as 301's, but not 321's marked as 301's. Not unless you got a factory screw up. Only way to know for sure if measure the cylinder thickness between the fins and see. I would definitely check it before I'd use it. Otherwise, it may break the jug off at the top of the block. Better safe than sorry. $$$$
That's the next step. If cylinder wall thickness is .070 or better I'm going to head strap it and send it!
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Old 01-25-2018, 06:47 AM
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...And I think the guy who told you that he used to bore 301 blocks to 3.5" was FOS...
It wouldn't be the first time... I thought that would be an awful lot of material to take away!
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Old 01-25-2018, 11:05 AM
mickb72 mickb72 is offline
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Originally Posted by austin8214 View Post
Right now I have what I assumed was a k321 block with the 1.380 exhaust valve in it. Today I was assembling it and noticed that the block had K301 cast in it. Has anyone else here seen this? I'm kinda wondering now if someone installed a larger valve in a K301 and bored it to 3.500.
Don't feel bad, i had a 16hp that was stamped 301. I posted about it here before. I mentioned it to Don V once. He didn't have much reaction, so i don't know if he actually caught what i said. Mike
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