ProMaxx Performance Products Cylinder Heads Maxx SBC 225 Straight Plug as Cast Hand Blended 2.08/1.60/64cc Assembled with .700″ Solid Roller Springs (Pair)
2121SR (Sold in Pairs)
The Maxx 225cc SBC head is our largest “as cast” head in our line up, flowing close to 300 cfm @ .700″ lift. This head will support big power at a price that can’t be beat.
Maxx SBC 225 Straight Plug As Cast Hand Blended 2.08/1.60/64cc Assembled with .700″ Solid Roller Springs (Pair).
Features:
- Ultra-smooth 356-T6 aluminum casting
- Multi angle valve job
- Precision CNC machining
- Angle or straight plug options
- 64 or 72cc chambers
- Professional assembly
- Assemblies include: 21-4N 1pc swirl polished back cut valves
- Machined and Assembled in USA
| Flow Data @ 28″ water | |||||||
| lift | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
| Int | 76 | 147 | 210 | 253 | 274 | 287 | 293 |
| Ext | 54 | 111 | 155 | 179 | 193 | 199 | 201 |
Technical Specification:
Combustion Chamber ……64-72cc
Weight …………………………55.00 lbs.
Intake Runner ……………. 225cc
Exhaust Runner …………..72cc
Intake Valve Size …………2.02”-2.08″
Exhaust Valve Size …….. 1.60””
Spring Pressure
Hydraulic Flat Tappet .575 max lift
Closed ………………….. 115 lbs. @ 1.800”
Open ……………………. 310 lbs. @ 1.225”
Hydraulic Roller .600 max lift
Closed …………………… 145 lbs. @ 1.800”
Open …………………….. 325 lbs. @ 1.200”
Solid Roller .700 max lift
Closed …………………… 230 lbs. @ 1.900”
Open …………………….. 600 lbs. @ 1.200”
******* other options available******
Valve Guide ……………Manganese Bronze
Valve Seal Material … Viton
Retainer Material ……Steel
Valve Job ……………… 5-angle
Head Bolts……………. ARP 134-3601
Valve Spacing ………. OEM
Valve Seats ……………Hardened Steel
Intake Gasket ………. Fel-Pro 1206
Exhaust Gasket ……. Fel-Pro 1404
Head Gasket ……….. Fel-Pro 1004 or 1094
Spark Plug …………. .750” Reach Gasket Seat
Torque specs …….. 80 Ft lbs. 3 increments using 30wt oil