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PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads 2171

PROMAXX Performance 2171 - PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads

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Cylinder Head, Freedom, Aluminum, Assembled, 72 cc Chamber, 185 cc Intake Runner, Straight Plug, Chevy, Pair

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Manufacturer's Part Number: 2171
Part Type: Cylinder Heads
Summit Racing Part Number: PMX-2171

Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 72
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc): 185cc
Exhaust Runner Volume (cc): 62cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Spark Plug Style: Straight
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.020 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.575 in.
Outside Diameter of Outer Spring (in): 1.270 in.
Damper Spring Included: Yes
Retainers Included: Yes
Retainer Material: Steel
Locks Included: Yes
Lock Style: Stock
Valve Stem Seals Included: Yes
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 3/8-24 in.
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: Yes
Guideplate Pushrod Size: 5/16 in.
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Manganese bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-angle
Valve Seat Material: Ductile iron
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold as a pair.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

PROMAXX Performance Freedom Series small block Chevy cylinder heads offer exceptional quality at an unbelievable price. They are manufactured from high-quality aluminum and assembled with the finest components. PROMAXX Performance Freedom Series small block Chevy cylinder heads feature one-piece stainless steel intake and exhaust valves, enhanced intake runners, and performance valve springs with steel retainers. They are available in straight or angle plug designs. Horsepower costs money. With Freedom Series small block Chevy cylinder heads, PROMAXX Performance offers you the opportunity to bolt on the power that you've been looking for, at the price you want!

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1 Customer Reviews for PROMAXX Performance 2171 - PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads

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Bolt them on, or get out the port work tools

Summit RacingSummit Racing Verified Purchase

If I would have had more time, I would have dressed the ports up to make them really spunky. They need minor clean up in the ports because of run of the mill castings. As is, they work considerable better off the bottom end than a set of old iron heads I port matched to a standard gasket and cleaned up inside. (In a big hurry, I put them on a 4-bolt main '68 Corvette 350 block with TRW 11:1 pistons, and an ancient 350 HP muscle car cam. I used fat head gaskets to drop the compression a little as well. I'm using 1.5 ratio rockers. 1.6 ratio rockers would pull harder mid-range and up, but not idle as well, or have as much low end torque. Just saying.) Order 1206 or equivalent intake gaskets with these heads. Otherwise, you'll have some issues. I have not purchased any of the pricier aluminum heads, so I don't really know if you are getting a really great deal with these heads. The castings have a good shape and flow well enough when just bolted on a peppy street block. If I had money to burn, I would order another pair and put 20 hours into them, and see if it made much difference. I'm thinking they might really wake up with a little work. If you have a set of old tired iron heads that need work, I'm thinking these would be a much better alternative than getting the old iron heads rebuilt. more

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Reviewer: STEVEN from CA

Date: May 11, 2014

Ease of Installation

Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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