Just to drag things on.... JIMS has been making a 131 and a 135 for years now....


http://www.jimsusa.com/

 

Here's the '131' I thought the Op was referring to at the beginning as to "having looked and found the biggest so far".

I was surprised to find that Merch is still in business. (Good prices too.)

http://www.merchmotors.com/

 

The OP was (maybe still is) confused about the relationship between cubic inches and horse power.

It is my understand that they automatically think that a 103" engine puts out 103 hp and the end goal is to put a 131" motor to make 131 hp.

 

I took it to mean he has the 103" ho and assumes it's 103hp. After doing a stage 1 he wants to know if he will have 131 hp.
A 103" ho with a stage 1 will not even break 100hp.

 

I'll tell ya, the next time i want more i"ll have to take a good look at the 114" Evo..