PERFORMANCE MODIFICATION & HELPFUL TECH TIPS FOR THE AMC SIX CYLINDER! Courtesy of Mojo! Performance Modifications. Well, here they are - all my secrets! Really they.
One of our six original section which started with just six entrants in April, 2007. The Shining Stars section features extended tributes on some of the most.
Performance modification & helpful tech tips for the amc six cylinder! courtesy of mojo! The authors who told you not to talk to a man first and not to talk too much are back with another helping of severe Rules for the digital age.
I've tried and know that they work. I hope. Water Pump: The late model 4. L H. O. (9. 1 – present) water pump is. The pulley bolt pattern is unchanged from the earlier AMC. The Moroso water pump drive may be used to drive the water. It can be wired to run clockwise or. Thermostat: Balanced, high- flow thermostats are available from.
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Robertshaw in 1. 60 and 1. I use the 1. 60 degree. Mr. Gasket also offers balanced, high- flow.
The Mr. Gasket ones are identical to those offered by. Robertshaw. Nothing less than 1. The above listed part.
V8’s. Timing Chain: Cloyes offers a “True Roller” dual- roller timing chain. AMC six. The crank gear has three keyways, allowing. This chain and gear set.
I have seen, and after thousands of street miles and. I bought it. A replacement chain is available for this set. The stock oil slinger may.
Carburetion: I’ve used two basic carbs, both Holleys. The. Holley 4- bbl. sizes best suited to this application are the 3. The 6. 00 cfm should be used in vacuum secondary.
Also popular are the 3. I feel that more precise mixture control is possible when using a. I install a Ford- type automatic kickdown throttle shaft in. Holley’s to run the A9. A new linkage rod. Although many people use a 3.
I feel that it presents too large a restriction at low. I have used a 3. 90 cfm HP series double- pumper.
For drag race use, the tunability of. The throttle butterfly plates must be. HP series carb. An air cleaner stud must be. HP series carburetor at all times due to the stud hole being. I have not used this size carburetor, although. I have done most of my racing with 6.
Many people feel that the 6. Tuning one to work well on the AMC six takes some finesse, but is well worth. My basic setup is as follows: Ford- style automatic kickdown. Quick- change secondary spring kit. Purple secondary spring. Moroso clear bowl sight plugs. Holley secondary metering block kit. Size 6. 7 primary jets. Size 7. Holley hollow accelerator pump. Size 4. 1 accelerator pump shooter.
Orange pump cam on position 2. I am using the wrong cam for the 5. Further gains can be realized by replacing the primary booster. The resulting increase.
RPM booster signal allows a minor reduction in main jet and accelerator. This modification can be performed by any of the. The Carb Shop and Holley Custom Shop.
Fuel Pump: The stock pump (with or without vacuum pump) is inadequate. The easiest solution is to use a Holley. The Holley “Blue” pump with regulator will provide. A big block Chevy fuel pump block- off plate will fit in place of the AMC six. Mr. Gasket. Air Filter: Always use an air filter, and never use any air filter. K& N. K& N filters have been proven to flow more air. Two 1. 4" K& N drop.
Javelin) air cleaners are available. Clifford intake manifold and Holley 4- bbl. NEVER. Your ring seal will suffer and.
Many carbs flow more air with an. Thermal Barriers / Surface Finishes: I have used Tech Line ceramic coatings on valves and.
Adhesion is excellent when the. For standard forged or cast pistons, their ceramic coating will improve. For hypereutectic pistons. Hypereutectic pistons have excellent insulating properties, and the only. I (and John Erb, Chief Engineer at KB/Silvolite) recommend is to.
Harmonic Balancer: Felpro offers a chrome plated repair sleeve for the. Cool the balancer in the freezer for a day and heat. Use of this sleeve and a new front seal will eliminate. Spark Plugs: Avoid Split- Fire sparks plugs – my back- to- back test. Champion plugs. Standard style Champion plugs have.
If you must use a glorified spark plug of some sort. Champion Gold. I gap my plugs at 0. GM HEI. and at 0. GM HEI coupled to a MSD 6.
AL. I have seen the. MSD generate a spark of over ½”. Use a minimum of one heat range. I use. Champion RN1.
YC, which is two heat ranges colder than the stock RN1. YC. There is also an extended tip version available you may want to experiment.
Plug Wires. I always use a quality spiral core wire like that made by. Taylor or Accel. Taylor has custom fit sets available for 6 cylinders. HEI boots; I use Taylor because they are located here in Kansas City and. I like to support the local economy when I can. Avoid solid core (they. Split- Fire plug wires (I hope it’s obvious. In order to minimize inductive crossfire related problems, do not. Keep all spark plug wires.
Smokey recommends ½” spacing between these items as a minimum. Head Gaskets: I've used two different head gaskets. I like the.
Felpro gasket best (Felpro 8. PT), and have had no failures with them. Felpro 8. 16. 9PT measures 0. I have also used a gasket from Victor which had a 0. I did experience a head gasket failure. I. I expose the engine to wide open throttle conditions, but with the ARP. Felpro gasket I have been finding that none is required.
Crankshafts: I've run in to two different 2. Casting 3. 21. 47. I've seen it in both 1. Casting 3. 18. 89. Borg Warner transmissions.
It won't. work with the Torqueflite without some machining, so I avoid them. I. I. have not attempted knife- edging or pin drilling on one of these cranks, though. My cranks are always ground.
The crank should be set up in the block after machining to check main journal. With the block upside down, insert the. Set up a dial indicator. Note that you can't just.
When. the crank is ground properly and the block has been align honed you will be. If this is not the case.
Balancing: The AMC six is internally balanced. All inline six. This allows all components to be balanced separately. Pistons and rods are scale balanced, and the crank, flexplate/flywheel, and.
You can change any component of the. Even after removal of casting flash, the 2.
Camshafts/Springs/Retainers/Lifters: I use a mild Crane hydraulic cam (part #7. Duration@0. 0. 50"=2. Advertised. duration=2.
Lift@1. 6=. 4. 84/. LC=1. 12. My rocker ratio is.
I end up with lift numbers of around . Although it doesn't appear that way from the numbers, this cam is extremely. The reason for these many qualities is the low overlap. Even with all the above. I still run in the 1. The only problem I have had with the camshaft is that it.
For my purposes, a camshaft of. Ultradyne is rumored to be able to grind custom cams for the AMC. AMC's and Chryslers use). The large diameter. The Chevy guys can't do this, and most cam companies base all their grinds of. Chevy. The springs, retainers, and lifters I'm using are those. Crane for this cam. Part numbers are: Springs = 9.
Retainers = 9. 99. Lifters = 9. 92. 78- 1. All have performed flawlessly. One note here though - the springs have a very large diameter that barely. Oil Pans: Oil pans are different between the 1. The 2. 58 pan has 6 protrusions on the drivers side to provide. I. learned this the hard way, and as a result I have a very nice 1.
I. baffle the sump of the pan using sheet metal equal to the pan thickness. The baffle is installed at the same height as the front floor of the pan, and. The baffle fits tight to the back of the pan to prevent oil. I use a Moroso. universal windage screen trimmed to clear the oil pump and connecting rods. The last item I install could be called a. Instead it helps create a pocket on the side of the pan that. The scraper rail must get a notch to allow the dipstick in to the oil pan.
The 1. 99 used 1. A steel crankshaft is rumored to exist (and would be. Barney Navarro's 6. HP turbocharged 1. Indy car engine. It is very.
All 1. 99 crankshafts use a. A plethora of 2. 32 cranks have been used. All are made from pearlitic. The original 2. 32 crankshaft was. I. believe the crankshafts were changed to a 1. No. steel crankshafts were produced; the design concept of the 2. The 2. 58 cranks come in two basic varieties: standard and lightweight.
The. standard cranks were used from 1. The. lightweight cranks were used from 1. Although heavier, the 1.
SCCA car testing. The early 2. 58 crank was designed for use. Borg Warner automatic, and requires an adapter to be used with a. Torqueflite automatic. The 2. 58 crankshafts use a 3. All 4. 0. L crankshafts utilize the same main journal and rod journal sizes as. AMC crankshafts. All 4.
L cranks are nodular iron, and use only 8. The stroke used in the 4. L engine is 3. 4. MODEL YEAR ENGINE PART # CASTING. NOTES 1. For Borg. Warner automatic.
For. Borg Warner automatic. For Borg. Warner automatic. For. Borg Warner automatic 1. Counterweights, for Borg Warner auto.
For. Borg Warner automatic. For Borg. Warner automatic. For Borg. Warner automatic.
For. Borg Warner automatic. For. Torqueflite automatic. For. Torqueflite automatic 1.
For Borg. Warner automatic. For. Torqueflite automatic. For. Torqueflite automatic. For. Torqueflite automatic. Lightweight. (1. 0 counterweights) crank. Lightweight. (1. 0 counterweights) crank 1. L 8. 35. 03. 40.
L 8. 35. 07. 10. L 4. 63. 89. 52 unknown 1. L 4. 72. 88. 82 unknown 1. L 4. 86. 47. 26 unknown Part numbers listed starting with 8.
XXXXX are assembly. Other part numbers may. Casting numbers are visible on the crankshaft. Casting numbers and part.
BIG BLOCK CHEVY ROLLER ROCKER. CONVERSIONCYLINDER HEAD CASTING.
INFORMATIONCONNECTING ROD INFORMATION: CONNECTING RODSThe production connecting rods for the AMC six come in a variety of. All are cast iron (although tracked by “forging” number). All are the same journal width and pin. Rods are available in two lengths, 5.
The 5. 8. 75" length was used in short deck (6. There are three castings: 1) early 2. The early 2. 32 variety was replaced with the newer, heavier casting starting. L2. 1, which makes them almost non- existant today.
The 6. 1. 25" long rods come in two varieties: 1) 1. L engines (muliple part numbers, see table below). The Jeep 4. 0. L rod is the strongest of the available 6. AMC rods. No production 1. If a 5. 8. 75" rod is required, use forging 7.
If a 6. 1. 25" rod is required, use 4. L rods. LENGTH ENGINE.
YEAR PART #.