I would think these heads would work nicely for stroker street motor.

I'm going to (eventually) build a 451 low deck since I picked up a 440 crank that has already been machined for the application. Tempted to run the trick flow heads because of the combustion chamber but honestly, I would probably be happy (aka, make plenty of power) with the unported Promaxx heads too.

anyways...

got an email back from Promaxx. I asked about their hydraulic spring application...


Lift intake exhaust
.200 157 108
.300 224 152
.400 275 184
.500 305 208
.600 318 227
.700 323 239
.800 327 247

The specs of the head stays the same, so the combustion chamber would stay at 84cc's. The manufacturer of the springs for this application is Pioneer.