Willie and McRat: 1.5" OD and .095 wall as rules call out for K displacement under 175mph
I can guarantee 110% you will regret this decision in the future.
Weight is not a negative factor (and is helpful), and you should always build your vehicle for at LEAST 2 engine displacement sizes over what you think you will run.
Once you run the little K displacement...what then....scrap the entire project?
After you set the records in K you will want to put a little bigger motor and go for the next records the next year. This is just how it goes.
When we started our project we NEVER thought it would go over 200, seriously.
Now we had to correct all the little issues that we should of done to start with and has cost some $$$.
But thank god we opted to go for a larger roll cage and at least that was good to go.
Do yourself a favor and take what I am saying to heart.
~JH