Indy 401-SR Cylinder Heads - Car Craft Magazine

Engine Specs
Cam bearing clearance: 0.0025
Crankshaft endplay: 0.003 to 0.008
Compression ratio: 11.13:1
Displacement: 438
Deck height: 9.180
Dish: 0.175
Final stroke: 3.934
Final rod journal: 1.889
Final bore: 4.210
Head gasket: 0.040
Main bearing clearance: 0.003 No. 1-4; 0.0035 No. 5
Piston compression distance: 1.213
Pin diameter: 0.927
Pin length: 2.750
Pocket: 0.250/0.250 18 degrees
Rings: 1/16; 1/16; 3/16
Ring gap: top and middle 0.015; bottom 0.015 to 0.055
Rod length: 6 inches
Rod bearing clearance: 0.003
Rod side clearance: 0.007-0.010

To get the intake ports as large as they are, the Indy heads have extra material around the intake ports that push stock intakes up. Note in the photo above, there is a gap between the block and the Edelbrock Performer RPM intake. The photo on the right is the Indy 401-3 single-plane intake. To use the Hogan's tunnel-ram, Mike from JMS built a spacer to fill the gap.
To get the intake ports as large as they are, the Indy heads have extra material around th
Another oiling trick is to match the cam and distributor gear in terms of hardness, gear-tooth depth, and proper gear angles for long-term use. This and making sure that oil gets through the cam gear on the timing chain ensures you won't eat the cam and distributor gears.
Another oiling trick is to match the cam and distributor gear in terms of hardness, gear-t
We went right for a massive, solid flat-tappet cam for this build. Since we've always run Lunati cams in the AMC, we chose a brutal 260/263 at 0.050 stick with 0.608 lift using a 1.6:1 rocker arm.
We went right for a massive, solid flat-tappet cam for this build. Since we've always run

The Indy 401-SR cylinder heads are a step up from the Edelbrock heads we've used in the past in terms of intake port size and valve sizes. With an intake port of 235 cc and an exhaust port measuring 105 cc, the Indy heads flow 262/209 cfm at 0.700 lift. The 2.10/1.65 valves need reliefs in the pistons.
The Indy 401-SR cylinder heads are a step up from the Edelbrock heads we've used in the pa
We also used Lunati 3/8-inch 1.6:1 rocker arms on the AMC. Note the huge fulcrum on the Lunati rocker (left) compared with Brand X.
We also used Lunati 3/8-inch 1.6:1 rocker arms on the AMC. Note the huge fulcrum on the Lu

On the dyno with a set of Holley 750-cfm carbs and a really cool Hogan sheetmetal intake, the mill squawked out 550 hp at 5,800 with a hugely fat torque curve and a peak of 548 lb-ft at 4,650 rpm. We're gonna need more tire.
On the dyno with a set of Holley 750-cfm carbs and a really cool Hogan sheetmetal intake,
Jeff at JMS set the cold lash at 0.018 on the intake and exhaust valve. As the engine heats up, the lash will grow about 0.004 to 0.005.
Jeff at JMS set the cold lash at 0.018 on the intake and exhaust valve. As the engine heat
Bulltear also offers a cylinder head porting service for stock iron heads, Edelbrock, or Indy aluminum heads. Matt at Bulltear posted 310 cfm in the intake side at 0.600 lift.
Bulltear also offers a cylinder head porting service for stock iron heads, Edelbrock, or I

Bulltear also offers a complete serpentine system if you need to swap from the three-bolt pulleys to the later four-bolt stuff. It also eliminates belt slippage usually associated with the stock systems.
Bulltear also offers a complete serpentine system if you need to swap from the three-bolt

SOURCES
Eagle Specialty Products, Inc. 8530 Aaron Lane Southaven MS 38671 662-796-7373 www.eaglerod.com	Bulltear Industries 30401 Neal Ave. Lindstrom MN 55045 651-257-7917 www.bulltear.com
Summit Racing PO Box 909 Akron OH 44398 800-320-3030 www.summitracing.com	Indy Cylinder Head 8621 Southeastern Ave Indianapolis IN 46239 317-862-3724 www.indyheads.com
JMS Racing Engines El Monte CA 626-579-4567 www.jmsracing.com	Lunati 11126 Willow Ridge Drive Olive Branch MS 38654 662-892-1500 www.lunatipower.com
Galvin's AMC Rambler Parts 634 East Lockeford Street Lodi CA 95240 209-365-6315 www.ramblerparts.com	Powermaster 1833 Downs Drive West Chicago IL 60185 630-957-4019 www.powermasterperformance.com
Autotronic Controls/MSD Ignition 1490 Henry Brennan Dr El Paso TX 79936 915-857-5200 www.msdignition.com	Milodon Inc. 2250 Agate Court Simi Valley CA 93065 805-577-5950 www.milodon.com
Holley Performance Products/Brands 1801 Russellville Rd. Bowling Green KY 42101 270-781-9741 www.holley.com	Hogan's Racing Manifolds Inc. 303 N. Russell Ave. Santa Maria CA 93458 805-928-8483 www.hogansracingmanifolds.com
Eagle Specialty Products 8530 Aaron Lane Southaven MS 38671 662-796-7373 www.eaglerod.com	Comp Cams Inc. 3406 Democrat Road Memphis TN 38118 800-999-0853 www.compcams.com