Summit has trick flow heads

younggun2.0 said

the trick flows are available with 3 different size valve springs. they can be ordered to suite pretty much any valve train.

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Trick Flow Powerport 240 Valve springs:

Standard
1.460" O.D. dual spring with damper (TFS-16534)
120 lbs. @ 1.900" installed height
394 lbs. @ 1.175" open
390 lbs. per inch rate
.650" maximum lift

Option 1
1.550" O.D. dual spring with damper (TFS-16094)
138 lbs. @ 1.950" installed height
430 lbs. @ 1.250" open
420 lbs. per inch rate
.680" maximum lift

Option 2
1.560" O.D. dual spring with damper (TFS-16318)
240 lbs. @ 2.000" installed height
600 lbs. @ 1.280" open
500 lbs. per inch rate
.700" maximum lift