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PROMAXX Performance Shocker Series Big Block Chevy Cylinder Heads 9340
Part Number: PMX-9340
PROMAXX Performance Shocker Series Big Block Chevy Cylinder Heads
Cylinder Heads, Aluminum, Bare, 121cc Chamber, 340cc Intake Runner, Chevy, Big Block, Pair
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Estimated Ship Date: Nov 3, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
9340
Part Type:
Product Line:
Summit Racing Part Number:
PMX-9340
Combustion Chamber Volume (cc):
121
Intake Runner Volume (cc):
340cc
Exhaust Runner Volume (cc):
135cc
Cylinder Head Style:
Bare
Cylinder Head Material:
Cast aluminum
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.300 in.
CNC-Machined Combustion Chamber:
Yes
CNC-Machined Intake Runner:
Yes
CNC-Machined Exhaust Runner:
Yes
Intake Port Location:
Standard
Exhaust Port Shape:
Round
Exhaust Port Location:
Raised
Spark Plug Style:
Straight
Intake Valves Included:
No
Exhaust Valves Included:
No
Exhaust Valve Diameter (in.):
1.880 in.
Valve Springs Included:
No
Damper Spring Included:
No
Retainers Included:
No
Locks Included:
No
Valve Stem Seals Included:
No
Rocker Arm Studs Included:
No
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
No
Valve Cover Mounting Style:
Perimeter bolt
Accessory Bolt Holes Drilled:
Yes
Intake Valve Angle:
24
Exhaust Valve Angle:
15
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
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold as a pair.
PROMAXX Performance Shocker Series Big Block Chevy Cylinder Heads
PROMAXX Performance Shocker Series big block Chevy cylinder heads are professional designed cylinder heads utilizing the latest CNC porting tools and techniques. These heads out flow the competition at a price that cannot be touched. The 340 heads will flow over 415 cfm and the 370 heads will flow over 450 cfm, so your engine will never be starved for air. Shock the competition without breaking the bank by ordering a pair of PROMAXX Performance Shocker Series big block Chevy cylinder heads.
Features, items, and specs:
* 340 or 370cc fully-ported runners
* 5-angle valve job
* 24 degree intake valve and 15 degree exhaust valve
* Diamond-honed guides
* Large spring pockets
* Multiple spring options
* 21-4N one-piece swirl-polished back-cut stainless steel valves
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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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