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  #21  
Old 09-29-2017, 09:23 PM
tmx43 tmx43 is offline
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I got some help from friends but ive not built a motor from a bare block. I did find a 40 over piston from the guy you recommended on the other post. I found the information on the pin height and rod length on another web site. ive read all I can find about kohler k motors. it does seem to be limited info on building engines for pulling.
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  #22  
Old 09-29-2017, 11:13 PM
J-Mech J-Mech is offline
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It's best if you get the pin height and rod length from the seller of the part, or the manufacturer. 3rd party websites are not reliable.

So..... did you read your rules for the club you want to pull in yet? What's your budget?
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  #23  
Old 09-30-2017, 08:43 AM
tmx43 tmx43 is offline
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yes a 60 over is allowed in pro stock class for 16 hp. im rebuilding a stock 1200 right now. ive restored other cubs to original condition and it seems to be hard to stay in budget on a build.
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  #24  
Old 10-01-2017, 09:38 PM
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austin8214 austin8214 is offline
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Quote:
Originally Posted by tmx43 View Post
I got two 13 fin bare blocks one narrow base and one wide base. the narrow base cc engines is bored 30 over. am I correct they can be bored larger?what would be the best way to go about building a pulling motor? im guessing a vm or mwsc crank , rod, piston assembly.
You can safely bore a 13 fin block out to almost 4".
However as mentioned you will need to get the correct rod and piston combo. You also need to take the club rules into consideration.
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  #25  
Old 10-01-2017, 09:54 PM
J-Mech J-Mech is offline
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Originally Posted by austin8214 View Post
You can safely bore a 13 fin block out to almost 4".
However as mentioned you will need to get the correct rod and piston combo. You also need to take the club rules into consideration.

How close to 4"? 3.900"? 3.800"? 3.999999999"??

You say a 13 fin. What about the 12 fin?
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  #26  
Old 10-01-2017, 10:28 PM
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How close to 4"? 3.900"? 3.800"? 3.999999999"??

You say a 13 fin. What about the 12 fin?
According to MWSC you can bore a k341 to 4" no problem.
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  #27  
Old 10-01-2017, 10:34 PM
J-Mech J-Mech is offline
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According to MWSC you can bore a k341 to 4" no problem.
Either? Or just a 13 fin?
They are different blocks.

You can bore some 241's to 301's, but not all.
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  #28  
Old 10-01-2017, 10:41 PM
tmx43 tmx43 is offline
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mwsc has a video on kohler k blocks. I believe they recommend a head strap when the 13 is bored near 4 inch.
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  #29  
Old 10-02-2017, 01:26 PM
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mwsc has a video on kohler k blocks. I believe they recommend a head strap when the 13 is bored near 4 inch.
Yeah, gotta head strap them when you bore one that big. I've heard of guys going a far out as 4.055 on a 13 fin block. Not sure what i would risk on a 12 fin.
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  #30  
Old 10-02-2017, 02:33 PM
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Either? Or just a 13 fin?
They are different blocks.

You can bore some 241's to 301's, but not all.
I have a k241 engine here that says k301 on the front, came out of a 104 I junked about 8yrs ago.
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