If he only wants 6-700 HP keep the CR high to make up for the smaller cubes.

 

I was just using that number as a point of reference not saying you need that much boost, just a number

 

I think he was just throwing numbers out there.. But you are right skyhighsami, the smaller displacement engine is going to have to work harder to make the same power level of the larger engine.... but is the 408 worth the cost? and some of the down sides? oil consumption is another point I havent seen in this thread. the 408 will burn more oil, but on the other hand you can run the rings tighter on the 408 so maybe that would over come the shorter piston skirts????

 

woops, I'm too slow on the reply...

 

This is the BIGGEST issue I see with the stroker motors.

 

Mikegyver:

I posted the dyno graph several weeks back, here it is again. We built a completely forged 408, eagle crank, arias pistons, 9.1. TVS 1900 rear inlet with ported LS2 heads, 1.75 roller rockers, etc. With a 2.8 inch pullley we made about 5.5lbs of boost until 6000 rpms when it bumped up over 6lbs. I will try and get the video posted. It can be done.

 

Positive displacement blowers and turbos are two completely different animals, lets not get them confused for this particular setup the OP is speaking of.

 

Wow. Cam specs?
The OP's question was displacement, I think everybody has been comparing 370 to 408, regardless of f.i. method.

 

True but regardless of CI the Positive displacement blower will achieve a greater amount of TQ down low simply because it produces airflow in a completely different way.

In other words the OP is wanting to go turbo... He will not see a TQ curve like the one posted above from the + displacement blower even if he runs the same boost level with a turbo with that same exact motor. They just make power in completely different manners.
Most guys assume PSI is horsepower instead of actually looking at it as restriction.

 

Good post. It should have been #47 instead of #49.