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PROMAXX Performance Maxx Series Big Block Ford Cylinder Heads
Cylinder Heads, Maxx Series, Hydraulic Flat Tappet, Assembled, Aluminum, 170cc Intake Runner, Ford, FE, Big Block, Pair
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Estimated Ship Date: Nov 3, 2026
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Overview
Brand:
Manufacturer's Part Number:
9170
Part Type:
Product Line:
Summit Racing Part Number:
PMX-9170
Combustion Chamber Volume (cc):
72
Intake Runner Volume (cc):
170cc
Exhaust Runner Volume (cc):
125cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic flat tappet
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.090 in.
CNC-Machined Combustion Chamber:
No
CNC-Machined Intake Runner:
No
CNC-Machined Exhaust Runner:
No
Intake Port Location:
Standard
Exhaust Port Shape:
Square
Exhaust Port Location:
Standard
Intake Valves Included:
Yes
Exhaust Valves Included:
Yes
Exhaust Valve Diameter (in.):
1.660 in.
Valve Springs Included:
Yes
Maximum Valve Lift (in.):
0.600 in.
Damper Spring Included:
No
Number of Springs Per Valve:
Dual
Retainers Included:
Yes
Retainer Material:
Steel
Locks Included:
Yes
Valve Stem Seals Included:
Yes
Rocker Arm Studs Included:
No
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
No
Accessory Bolt Holes Drilled:
No
Valve Guides Included:
Yes
Valve Guide Material:
Manganese bronze
Valve Seats Machined:
Yes
Valve Seat Machine Style:
5-angle
Valve Seat Material:
Steel
Cylinder Head Color:
Natural
Steam Holes Drilled:
No
Oiling Style:
Through pushrod
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold as a pair.
PROMAXX Performance Maxx Series Big Block Ford Cylinder Heads
PROMAXX Performance Maxx Series big block Ford cylinder heads make upgrading or reviving your FE motor affordable. These heads feature ultra-smooth 356 T-6 aluminum casting, 5-angle valve jobs, precision CNC-machining, and diamond-honed bronze guides. Don't get stuck doing the typical upgrade/repair--kick it up a notch with a pair of professionally assembled PROMAXX Performance Maxx Series big block Ford cylinder heads. They also offer bare options.
Features, items, and specs:
* 170cc intake runners
* Hand-blended bowls
* Unshrouded chambers
* Large spring pockets
* Multiple valve sizes available
* Multiple spring options
* Assemblies will include 21-4N one-piece swirl-polished back-cut valves
Applications
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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