ProMaxx BBC 317cc Big Block Chevy Cylinder Heads

$1,150.00

 

The Maxx 317 is truly a rare breed in today’s market. An As Cast head that is just as efficient as competition’s CNC ported pieces. Independent flow bench testing shows over 385 cfm with 2.250 Intake valve and over 400 with 2.300 valves. This head will change the industry. Compare to any brand, this head makes power!

 

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Category:

Description

ProMaxx BBC 317cc As Cast (Bare Heads) = $1150 pr

Specs:
2.250″/1.880″ valve sizes,
119cc chambers
317cc Intake Runner

Flow Specs @ 28″ w/2.250″/1.880″ w/30° Backcut valves

.200″ .300″ .400″ .500″ .600″ .700″ .800″ .900″
Intake 151 230 292 338 367 379 372 379

Exhaust 120 162 197 238 254 260 270 270

Add $500 for Assembled Heads for Flat Tappet cams up to.650″ lift:
Stainless Steel Erson Competition Series 2.250″/1.880″ Valves 11/32″
Erson 3425 Dual 1.460″ Springs 125lb @ 1.900″ / 415 @ 1.250″ .650″ max lift
Erson Steel Retainers, 7* Locks,7/16″ Rocker Studs, 3/8″ Guide Plates, Viton Seals

Add $600 for Assembled Heads for Hyd. Roller cams up to.650″ lift:
Stainless Steel Erson Competition Series 2.250″/1.880″ Valves 11/32″
Erson 3600 Dual 1.540″ Springs 180lb @ 1.950″ / 500 @ 1.300″ .700″ max lift
Erson Steel Retainers, 10* Locks,7/16″ Rocker Studs, 3/8″ Guide Plates, Viton Seals

Add $800 for Assembled Heads for Solid Roller cams up to.780″ lift:
Stainless Steel Erson Competition Series 2.250″/1.880″ Valves 11/32″
Erson 3870 Dual Cyloy 1.625″ Springs 235lb @ 2.00″ / 680 @ 1.300″ .780″ max lift
Erson Titanium Retainers, 10* Locks,7/16″ Rocker Studs, 3/8″ Guide Plates, Viton Seals