9.1 is to be determined by how far the darn pistons are in the hole @.185 in the hole with a stock compression of 8.4 to 1 for 1978 model year. I'd pretty much have to deck the block .60 to .80 at least and shave the head to get to 9 to 1. but I would not even wince at hitting 10-12psi turbo"ing" it. even on a stock motor. I know the higher the compression the lower the boost that can be tolerated. 225 1976-78 8.4 to 1 100 @ 3600 170 @ 1600
uhhhh really? not snappy? I'm sorry to disappoint you but there a few owners of sub 12 second 6 cylinders over on slantsix.org that might just disagree with you. Even a bunch of 12-14 second /6 turbo guys that will spank your mild build v8 all day long AND get better gas mileage while driving it home without doing anything to the car. when you have to trailer yours or change the slicks out for street tires. I've had both turbo(65 Plymouth Belvedere 440, turbo@ 21psi) and supercharged big blocks (tubbed 440 66 Coronet, supercharged, got enough money from selling that car to get my 70 challenger 440 6 pack 4spd) and yup there is instant response from the supercharger. but(in my opinion) it's 3 times as expensive as a DIY turbo setup. Twice as fiddly and a pain in the *** to look over when driving(hey I'm only 5'6" tall) even though they do look good parked at car shows. So if your going for bling, performance and a stiff neck trying to look around the darn thing along with a pocket full of money "go for it". I just like a different approach with reliability, a stock flat hood and performance without a stiff neck looking around the hood ornament on my budget.
