Summit has trick flow heads

DrCharles said

Any way to find out what the specs on the various offered springs are? "max .680 lift" and "hydraulic roller cam" doesn't tell me much...

Click to expand...

It's all right here. Scroll down after opening link or read below:

http://www.trickflow.com/pressreleases/powerport240cylinder/

Valve Springs, Standard: 1.460" o.d. dual spring with damper
120 lbs. @ 1.900" installed height
394 lbs. @ 1.175" open
390 lbs. per inch rate
.650" max. valve lift

Valve Springs, Optional: 1.550" o.d. dual spring
138 lbs. @ 1.950" installed height
430 lbs. @ 1.250" open
420 lbs. per inch rate
.680" max. valve lift