Indy Cylinder Head

Indy's T/A heads are a proprietary modification of the Edelbrock cylinder head castings by Indy Cylinder Head. The concept here was to take what is already a popular and excellent quality casting, and address some key issues to raise the ultimate power potential of the heads. To accomplish this, the heads are provided to Indy in as semi-machined castings, allowing for the unique Indy T/A configuration. The primary modification is to alter the intake pushrod clearance location away from the intake ports, which removes the primary restriction on port width. This allows Indy to widen the runner at the pushrod restriction by 0.190-inch compared to a standard Edelbrock LA head.

The angled pushrods require an offset rocker arrangement. Indy relocates the rocker mounts for longer 440-style Indy offset rockers, upgrading the fastener size and alleviating the restricted spring clearance found in a standard small-block Mopar head. The heads feature larger valves than the stock Edelbrock, with 2.05-inch intakes. While the Indy T/A utilizes an offset rocker arrangement, it retains the OEM LA-Series intake and exhaust bolt patterns, for compatibility with standard intake manifolds and exhaust headers. The heads are an excellent choice for a hot street or strip stroker looking for more power potential than a standard-style head, or a smaller displacement engine looking for outright high-rpm power. With full porting, the right combination should top the 600hp mark.

Moving up to make power on a more serious level takes moving up to a more serious cylinder head configuration. The 360-1 and 360-2 cylinder heads take the top-end combination to race level performance, with essentially the Mopar W-series style mods. Here, the first thing we find is the offset rocker arrangement, using Indy's big-block style rockers with 0.800-inch offset on the intake. This gives the clearance for the large valvesprings required in a serious engine, and also allows larger, unobstructed intake ports. The 360-1 features rectangular intake ports, while the 360-2 carries a smaller oval port. These cylinder heads are fitted with oversized 2.100/1.625-inch valves and have the W-2 style intake manifold bolt pattern and both the standard and W-2 exhaust bolt patterns. Additionally, these heads have the extra bolt provisions for the race-block 18-bolt deck pattern and are still compatible with the factory 10-bolt pattern.

If you are looking to take power to the next level, the Indy cylinder heads have what it takes. The fully CNC ported versions from Indy offer the required flow, and the race-derived cylinder head configuration takes care of the rest. Indy puts the power capability of the 360-1 at 750 horsepower, and at 700 for the 360-2 oval port. If you are building a serious Mopar small-block, the Indy 360 heads are definitely designed to take care of business.

Head: Indy T/A
Intake Port Volume: 175cc As Cast
Chamber Volume: 63cc
Intake Flow: 275 @ 0.600 As-Cast (306 @ 0.700 Full Indy Porting)
Exhaust Flow: 182 @ 0.700 As-Cast (197 @ 0.700 Full Indy Porting)
Intake Valve Size: 2.050
Exhaust Valve Size: 1.600
Rockers: Indy Offset, Intake
Bolt Pattern Intake: Standard LA-Series
Bolt Pattern Exhaust: Standard LA-Series
Bolt Pattern Deck: Standard LA-Series

Head: Indy 360-2 (360-2 CNC Optional)
Intake Port Volume: 180cc (230cc CNC)
Chamber Volume: 63cc (65cc CNC)
Intake Flow: 252 @ 0.700 As-Cast (322 @ 0.700 CNC)
Exhaust Flow: 189 @ 0.700 As-Cast (255 @ 0.700 CNC)
Intake Valve Size: 2.100
Exhaust Valve Size: 1.650
Rockers: 0.800-Inch Indy Offset Intake or Jesel
Bolt Pattern Intake: W-2 Pattern
Bolt Pattern Exhaust: Standard LA-Series and W-2
Bolt Pattern Deck: Provisions For 18-bolt Pattern Included

Head: Indy 360-1 (360-1 CNC Optional)
Intake Port Volume: 210cc (245cc CNC)
Chamber Volume: 63cc (65cc CNC)
Intake Flow: 280 @ 0.700 As-Cast (330 @ 0.700 CNC)
Exhaust Flow: 189 @ 0.700 As-Cast (255 @ 0.700 CNC)
Intake Valve Size: 2.100
Exhaust Valve Size: 1.650
Rockers: 0.800-Inch Indy Offset Intake or Jesel
Bolt Pattern Intake: W-2 Pattern
Bolt Pattern Exhaust: Standard LA-Series and W-2
Bolt Pattern Deck: Provisions For 18-bolt Pattern Included

Mopar Performance

Mopar Performance's entry into the aluminum small-block cylinder head market starts with the Aluminum Magnum and the Aluminum Commando LA-Series cylinder heads. These heads are based on the Edelbrock castings, and in terms of the relative configurations, they are virtually identical to the Edelbrock RPM offerings. As with the Edelbrock heads, the Mopar versions make a nice street performance head as a bolt-on 400-plus horsepower assembly in a mild small-block, and max-out in the mid 500s with competent full porting.

The Super Commando cylinder head is also based on the Edelbrock castings; however, these heads feature larger intake valves and the offset rocker modification, allowing the intake port to be wider and unencumbered. As with the Indy T/A, this modification allows more intake port cross-sectional area and an improvement in intake port flow potential. The Super Commando utilizes a unique rocker offset and is serviced by Mopar #P5153995 rocker arms, though the availability of these corresponding rockers has been sporadic.

In terms of additional Aluminum Small Block cylinder heads from Mopar Performance, the company does offer a range of full-on race heads in their W-9 and P5 series. These heads are designed for use on the Mopar Performance race blocks. Although it is possible to utilize these heads in an all-out build, they and are outside the realm of the street/strip cylinder heads we are detailing here.

Head: Mopar Commando LA
Intake Port Volume: 171cc
Chamber Volume: 63cc (65cc relieved optional)
Intake Flow: 251 @ 0.600 As-Cast
Exhaust Flow: 190 @ 0.600 As-Cast
Intake Valve Size: 2.02
Exhaust Valve Size: 1.60
Rockers: Standard LA-Series
Bolt Pattern Int/Exh: Standard LA-Series
Bolt Pattern Deck: Standard 10-Bolt

Head: Mopar Aluminum Magnum
Intake Port Volume: 176cc
Chamber Volume: 58cc
Intake Flow: 260 @ 0.600 As-Cast
Exhaust Flow: 190 @ 0.600 As-Cast
Intake Valve Size: 2.02
Exhaust Valve Size: 1.60
Rockers: Chevy SB Stud Mount
Bolt Pattern Int/Exh: Magnum Vertical

Head: Mopar Super Commando
Intake Port Volume: 175cc
Chamber Volume: 63cc
Intake Flow: 265 @ 0.700 As-Cast
Exhaust Flow: 190 @ 0.700 As-Cast
Intake Valve Size: 2.055
Exhaust Valve Size: 1.600
Rockers: MP Offset Rocker Arm Set P5153995
Bolt Pattern Intake: Standard LA
Bolt Pattern Exhaust: Standard LA-Series mm


Sources

Brodix
479/394-1075 ' www.brodix.com

Dr J's Performance
714/808-9780 ' www.j-performance.com

Edelbrock
800/416-8628 ' www.edelbrock.com

Indy Cylinder Head
317/862-3724 ' www.indyheads.com

Koffel's Place
419/443-4410 ' www.b1heads.com

Mopar Performance
www.mopar.com

SOURCE
Brodix
301 Maple P.O. Box 1347
Mena
AR  71953
479-394-1075
http://www.brodix.com
Edelbrock
Torrance
CA
800-416-8628
http://www.edelbrock.com
Indy Cylinder Head
8621 Southeastern Ave
Indianapolis
IN  46239
317-862-3724
www.indyheads.com
Koffel’s Place
740 River Rd.
Huron
OH  44839
419-433-4410
419-433-2166
Dr. J's Performance
436 S Montgomery Street
Orange
CA  92868
714-808-9780
http://www.j-performance.com