A motor is a motor is a motor ! You have to do the same things that you would do to a V-8 to increase performance. Maybe a new cam...head work.. different carb...ignition...headers...I can go on forever. The parts are available from many sources for the Chevy Sixes. All of the major manufacturers hve cams etc. Just let your fingers do the searching !
By the way there are plenty of very strong running sixes out there.
Advanced Automotive Machine
Listen to these guys and treat it like it was any other motor you wanted to hop up.
By the way, I had a '68 in high school with the 250 6-banger. My dad and I put header/s on it with duals and a heavy duty clutch for the 3 speed. What fun! I used to pull all the 80's stock V8 Camaros across the intersection because it was so torquey.
If you do anything extensive to it, you're probably going to spend more money than you would doing a small block swap. Unless you're sentimentally attached to an i6, it's probably a waste of cash (IMO)...
[This message has been edited by robzr (edited 12-10-2000).]
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