ProMaxx Performance Products Cylinder Heads Maxx BBC 290 Oval Port 2.250/1.88 110cc Bronze Guides
9291 (Sold in Pairs)
The Maxx 290 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 400 cfm with 2.300 valves. This head will change the industry. Compare to any brand, this head makes power!
Maxx BBC 290 Oval Port 2.250/1.88 110cc Bronze Guides 5 Angle Valve Job Bowl Blended Stainless 1pc Valves Assembled with 600 Lift Hyd Roller Springs (Pair)
Features:
- 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 |
Technical Specification:
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 1275
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
