- 290cc Intake runner
- 24 degree Intake valve angle
- 15 degree Exhaust valve angle
- CNC inspired casting
- Ultra-smooth casting
- 356-T6 aluminum
- Multiple valve sizes available
- Over 375 cfm
- .750 deck thickness
- Diamond honed guides
- Multiple spring options
- 5 angle valve job
- Professional Assembly
- Machined and Assembled in USA
- Assemblies include: 21-4N 1pc swirl polished back cut valves, 7/16 studs and guide plates
Flow Data @ 28″ water |
|
|
|
|
|
|
lift |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
Int |
159 |
233 |
290 |
327 |
357 |
372 |
375 |
376 |
Ext |
135 |
182 |
221 |
261 |
283 |
297 |
303 |
305 |
PART # |
BRIEF DESCRIPTION |
PLUG TYPE |
CHAMBER SIZE |
VALVE SIZE |
MAX LIFT |
9290 |
290 BBC Bare |
|
110 |
2.250/1.88 |
|
9291 |
290 BBC Assy |
|
110 |
2.250/1.88 |
.600 Hyd |
9292 |
290 BBC Assy |
|
110 |
2.250/1.88 |
.700 Solid Roller |
9293 |
290 BBC Assy |
|
110 |
2.250/1.88 |
.700 Solid Roller Ti Retainers |
9294 |
290 BBC Assy |
|
110 |
2.250/1.88 |
.850 Solid Roller Ti Retainers |
Combustion Chamber ……110cc
Weight …………………………78.00 lbs.
Intake Runner ……………. 290cc
Exhaust Runner …………..135cc
Intake Valve Size ……….2.250
Exhaust Valve Size …….. 1.88”
Spring Pressure
Hydraulic Roller .600 max lift
Closed …………………… 135 lbs. @ 2.000”
Open …………………….. 365 lbs. @ 1.350”
Solid Roller .700 max lift
Closed …………………… 220lbs. @2.000”
Open …………………….. 600 lbs. @ 1.300”
Solid Roller .900 max lift
Closed …………………… 325 lbs. @ 2.100”
Open …………………….. 840 lbs. @ 1.200”
******* other options available******
Valve Guide ……………Manganese Bronze
Valve Seal Material … Viton
Retainer Material ……Steel
Valve Job ……………… 5-angle
Head Bolts……………. ARP 135-3603 Mark IV/ 135-3607 Mark V
Head Studs ………….. ARP 235-4703 Mark IV/ 235-4713 Mark V
Valve Angle ………. 24/4 intake 15/4 exhaust
Stud Girdle………….Harland Sharp G1114 or equivalent
Valve Seats ……………Hardened Steel
Intake Gasket ………. Fel-Pro 1212
Exhaust Gasket ……. Fel-Pro 1412
Head Gasket ……….. Fel-Pro 1047 Mark V and Mark VI / 1017 Mark IV
Spark Plug …………. .750” Reach Gasket Seat
Torque specs …….. 80 Ft lbs. 3 increments using 30wt oil
Exhaust Ports ………. Raised .375