Modified clone question

wayne64

New member
I'm interested in building a modified clone, to race in the outlaw division at my local track. I'm new to engine building, and don't want to spend a large sum of money, so I'm trying to keep this simple and basic. Billet flywheel and rod, flat top piston, gx390 carb, oversized valves, and a dyno 308 cam are what I'm planning on using. My question is....should I have the cylinder bored .030 over? How many more cc's would this add? Would it add much power? and would it lower my compression? Also....with the 308 cam, how much will I be able to have my head milled, without the piston hitting the valves? Thanks so much for any and all answers. Like I said, I'm new to this and would like to learn as much as possible, and there is no better place to learn, than from the experts here at Bob's. Hope everyone has a great Thanksgiving!
 
I won't say that boring the block and the .030 piston won't help, but getting the head flat milled about .050 would definetly help, and maybe a .020 longer rod wouldn't hurt either ! Are you going to run gas or aclcohol ?
 

wayne64

New member
I'd like to run gas.....that would make it easier to switch back to my stock motor, when I race in the box stock division.
 

SHAVED APE

New member
From the $ standpoint ,you should find someone in your area to torque-plate and hone your block and leave it at std bore . Go ARC rod and Honda T 3 piston would be a good inexpensive combo .
 
I would subjest 28.5 intake and 25mm exh valves. 14 / 18cc head milled and a 70mm piston and longer rod if possible. JMO
 

wayne64

New member
Oh, okay.....I was always under the impression that the combustion chamber on the 14cc head was too small to use oversized valves.......thanks for the info.
 

DynoDon

Moderator
The term"modified" and " not want to spend a lot of money" is an oxymoron. lol
 
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