For the Power Nation 292 build which included engine rebuild and new parts. The whole build was probably in the area of $3000?! They got ~400HP and 500+tq. To get a JY turbo setup from a Pontiac 301 and DIY the rest is a few hundred, ~$1200 if you add JY TBI and Megasquirt EFI.

If you just look at the number of 4-71 blowers or roots blowers general availability vs the aftermarket or used 5L turbos there is no comparison.

Turbos vs SCs also apply power differently. Leo even mentions (more than once), the turbo advantage, in his book. When designed correctly, a turbo is a great companion to augment the GM inlines' capabilities.

Regards,
RJ

Last edited by Rjonah; 05/16/20 03:37 AM. Reason: Additional info.