hi guys. does anybody know what is the max boost a holley thunder kit will make?

 

Its not much, HD2nv89 knows for sure. With a build block and polished and ported heads, He also had a pulley made for it and was only getting around 340 hp. My guess unless HD2NV89 chimes in was only making about 8-9 psi of boost.

 

I seem to remember that 8-9 psi at 5,000 RPM is approaching 1.5 HP per cubic inch. That's a memory from an earlier life though, so I could be mistaken.