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However, IF a guy took a standard 360 crank, and turned it for Honda bearings (common enough in SBC's these days - as is done in the 383 build on IFSJA) and had the crankshaft offset ground to a 3.65 stroke. Rear Flange 6 Bolt AMC 1971 and earlier style. The 401 debuted in 71 and they’re basically the same casting with a larger bore. Have your machinist sonic test it. The Ford 390 was a big block FE series engine with a 10.17" block deck height, 4.63" bore centers, 4.052" bores, and a 3.784" stroke. 401 stroke = 3.68". 6600X-4080 for a 4.080 bore. In order to create the 401, AMC increased the 390’s stroke to 3.68 inches and kept the 390’s bore size. Offset grind the 390 crank for a 2.00‚Äù Chevy Rod Journal, to a 4.07‚Äù stroke. 3. Are you having Doug do the work? Series. 360 Available Bore Sizes 4.080, 4.110, 4.120, 4.140. 360 rod = 5.875". AMC 390 pistons. That put it solidly in the field with the rest of the pony car stampede. My machinist is concerned with some deep rust pits in some of the cylinders.What would be the maximum bore I could go without having other issues? The company offers 12 different hypereutectic 390 alloy pistons it manufactures for 390 and 401 engines. For a street cruiser you can push it to a larger overbore. AMC's Javelin and AMX 390 super cars were also quick. -Same stroke as 360ci with smaller bore. It's pretty much proven an increase in bore reduces power, as any slight increase in cu in is more than lost in reduced wall stiffness. 390/401 rod = 5.858". amc 360 - 390 - 401 360 Available Bore Sizes 4.080, 4.110, 4.120, 4.140 390/401 Available Bore Sizes 4.165, 4.185, 4.195 Add the bore size to the end of the part # IE. The safe over bore is .015 - .030, anything more is a shot in the dark. Then bored the 360 block to 4.125, you would have a … American Motors Corporation AMC High Performance and Racing Parts. The 401 has a 3.860-inch stroke, which gives it raw mechanical advantage over the 390's … These engine blocks were unchanged until the end of 69. 4. with a special bore and stroke combination to retain the 390’s cu and the new deck height. 60 over? The GEN-2 AMC V8 was first introduced at 290 cu in in 1966. 390 stroke = 3.57". Shipping in the USA for this item is only $14.95 when you spend $380.00 or more! In 1970, AMC changed the head … Bore and stroke: 3 1 ⁄ 4-by-3 1 ⁄ 4-inch (82.6 mm × 82.6 mm) Compression: 7.5:1; Horsepower: 52 hp (39 kW) @ 3,600 rpm; Audi/VW 121. 360 bore = 4.08". Hi Bernie, yes, Doug is building a stroker AMC  for me this winter.I plan on using the new Molnar rods with Race Tec pistons. Confirm original displacement. With a curb weight of 3221 lbs (1461 kgs), the AMX 1968 V8 390 4-speed Go-Pkg has a naturally-aspirated V 8 cylinder engine, Petrol motor, with the engine code AMC V-8 390. AMC 390 pistons. 78" stroke. GEN-2 AMC Short-Deck V-8 (1966–1970) The new-generation AMC V8 was first introduced in 1966. Hypereutectic step dish piston and ring set. These pistons are for use in: Standard bore size 4.165 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin weight 157 grams. AMC 390 Pistons and rings | .030 over | KB418ktm-30, These pistons are for use in: .030 over bore of 4.195 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin weight 157 grams, AMC 390 Pistons and rings | .040 over | KB418ktm-40, These pistons are for use in: .040 over bore of 4.205 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin weight 157 grams, AMC 390 Pistons and rings | .060 over | KB418ktm-60, These pistons are for use in: .060 over bore of 4.225 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin weight 157 grams, Automatic Transmissions, Torque Converters & Parts. Rotating Assembly Both 390 and 401 engines have stock 4.165-inch cylinder bores, but at 3.574 inches, the 390's stroke is 0.106 inch shorter than the 401's 3.68-inch stroke. The GEN-2 AMX 390 produced 315 hp and was built in 1968 and 1969. Contributed By: Michael Baxte r. AMC deck height = 9.218" (SB Chevy 9.025" for S & Gs) 360 stroke = 3.44". AMC 360 Engine Build - 370-Inch 480HP AMC Got an AMC? Select your stroke length in Columns 3-6. CID. If the bore (diameter) is 4.05", the radius (half … Bore, Standard Rod, Standard Main, AMC, 360, Kit Part Number: FEM-205715M-300 DURING THE FIRST YEARS THE MOST POWER CAME FROM A 325 HORSE AMC 390, WHICH EVENTUALLY WOULD GET FACTORY STROKED TO BECOME A 401. Select motor type and/or bore size in Column 1. As a general rule you should always bore it the least possible. Follow along as we build a 370-Inch 480HP AMC By Douglas R. Glad Photography by Douglas R. Glad ... you'll notice there are changes in bore and stroke and a major increase in deck height in 1970 to 9.208 inches. Stock AMC main journal sizes, Rod Journal Size is 2.100 small block chevy diameter. In addition to the largest bore and stroke, the 390 cu in (6.4 L) AMX motor also received heavier main bearing support webbing and a forged steel crankshaft and connecting rods. Some, very few, 390 blocks will take a .080. AMC V8 Engines - From GEN-1 Nash/Hudson/Rambler V-8s (1956-1966) through to the GEN … Engine specific production specifications for 360 - 401 engines! AMC moved to the taller deck block for 1970 with the 290 becoming the 304, the 343 becoming the 360 and the 390 was retained(Due to provenance?) Maximum factory recommended overbore is only 0.020 in, though they are commonly bored 0.030 in. Quantities can be changed by clicking 'view cart' at the top of any page. AMC 390 pistons. 6600X-4080 for a 4.080 bore The 390 in my Machine is 0.060" over and it's had no problems. In 1970, all three blocks grew in deck height and gained a new head design. Forged cranks and rods were used for their known strength—there was inadequate time for testing cast parts for durability without delaying AMC's introduction schedule. The 121.1 cu in (1.98 L) was an advanced design overhead camshaft four-cylinder EA831 engine bought from Audi/Volkswagen 1977 through 1979. Your donations help keep this valuable resource free and growing. High strength hypereutectic piston set for use in high performance engines. The 390 and 401 have the same 4.165-inch bore size. This engine produces a maximum power of 320 PS (316 bhp - 235 kW) at 4600 rpm and a … If you want to use a 1972 or later style flexplate / flywheel a concentric adapter will be required. Quote Reply Topic: 390 safe maximum bore Posted: Oct/03/2015 at 9:21pm: ... Hi … Price: $653.94 $562.39  +  DISCOUNTED SHIPPING!Shipping in the USA for this item is only $14.95 when you spend $380.00 or more! We have rods available for the AMC 360, 390 and 401 engines with stock stroke crankshafts and also special AMC stroker rods, 6.000 and 6.125 inch long for use with either a 2.000 inch or 2.100 inch crankshaft rod journal size as used on many AMC stroker cranks. Run off the shelf 5.7‚Äù H-beam rods for Chevy 6-cylinder (wide big end rod) Comes out to 9.75:1 compression and 0.030‚Äù deck clearance. The 390, with 389.6 cu in (6.4 L) true displacement, had a bore of 4.05 inches (102.87 mm) and stroke of 3.78 inches (96.01 mm). I have seen a lot of core shifting on 390 blocks and testing is the only way to tell. It is sometimes referred to as the "GEN-2" AMC V-8. To use this Chart1. Since the 304 and 360 share the same stroke crankshaft, can I actually bore the 304 to a 4.08 piston size (standard 360) and have a 360 cubic inch 304 Block? There is also a extra heavy duty turbo, blower, nitrous AMC Power Adder series rod set available. AMC v8 block/crank/rod/piston Specs. You need to be sure there is no core shifting, a sonic sheck is in order - before - going under the boring bar. All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved. Only the bore and stroke are different and Cubic Inch stamp, but they both share the same block casting number. The 390 had a 4.165 inch bore and a 3.574 inch stroke. 390: 70-390: 401: Production years: 1965-1970: 1964-1979: 1971-1990: 1966-1969: 1970-1981: 1967-1969: 1970-1991: 1968-1969: 1970: 1971-1979: Bore: 3.75: 3.75: 3.75: 3.75: 3.75: 4.08: 4.08: 4.165: 4.165: 4.165: Stroke: 3: 3.5: 3.895: 3.28: 3.44: 3.28: 3.44: 3.574: 3.574: 3.68: Deck height: 9.531: 9.531/9.281: 9.281: 9.175: 9.208: 9.175: 9.208: 9.175: 9.208: 9.208: Bore spacing: 4.38: 4.38: 4.75: 4.75: 4.75: 4.75: … Click the 'Add to Cart' button above to place this item in your shopping cart - you will not be charged by doing this. Here is my "wondering" to myself, and now to you. 360ci: 1970 to 1991: 4.080: 3.440-Longest production run of any AMC engine -Most common size of AMC blocks. AMC 390 Pistons and rings | Standard Bore | KB418ktm, Manufacturer: Keith Black Pistons KB PistonsComponent: Pistons, 390 Pistons. 1966-1969 (290, 343, 390) The AMC small block was first introduced as a 290 in 1966. Set includes 8 pistons; 8 wrist pins; piston ring set and lock rings. These changes made this the third generation of AMC V8, hence it is sometimes referred to as the "Gen-3" AMC V8. Run off the shelf KB Chevy 400 pistons at STD bore 4.125‚Äù (1.433‚Äù pin height & 22 cc D-dish). Crank: AMC offered four factory stroke lengths: 3.28-inch for the 290/343, 3.44 inches for the 304/360, 3.574 for the 390, and 3.680 inches for the … 2. The GEN-2 is closer to the physical size of U.S. made small-block V8s except for the bore centers, which are the same as some big-block engines. I have a 1970 service block, stock bore. It was used exclusively in the Rambler American model the first year. Hypereutectic step dish piston and ring set. Sonic test the top of cylinder, under the deck is usually the thin spot. Bore is 4.165 in (105.791 mm) and stroke is 3.68 in (93.47 mm). It is not something I would recommend. Have one running now that did not clean up - works fine, and makes major power. I to have not much concern for .030", but in sustained long term race use have seen cracked cylinder walls at that. Inside, though, it was an animal: A forged crank and connecting rods helped shore up the two-bolt-main bottom end. Where the 390 and 401 differ is in their stroke. These pistons are for use in: Standard bore size 4.165 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin … View this page as large as possible, and under high resolution for best results. Hypereutectic step dish piston and ring set. Or sleeve it? AMC 360 - 390 - 401. For 1971 the 401 was equipped with a 4-barrel carburetor and produced 330 gross horsepower and 430 lb-ft of gross torque. Cranks were cast iron. High strength hypereutectic piston set for use in high … Another observation is if the overbore leaves some pits that are not to serious simply run it, especially if they are not at the top of the bore. 360 390 401 AMC stroker crankshaft billet steel 4 inch stroke. A greater bore and stroke, 10.2:1 compression ratio, a Carter AFB carburetor, and dual exhaust meant a rated output of 315 horsepower and 425 lb-ft of torque. 390ci: 1970: 4.165: 3.574 Thank you. It all depends. The stroke and deck height on the 290 and 343 were increased by 0.16 in (4.06 mm) on both engines, becoming the 304 cu in (5.0 L) and 360 cu in (5.9 L), respectively. The best way to get more cubes is with a stroke crank. Confirm exact bore size in Column 2. Racing stroker kit that gives the Ford 390 FE a whopping 4.250 inches of stroke in the middle of a 4.130-inch bore… It is believed that AMC kept the 390 this last year due t… Good to know I have a 70 390 on a shelf that is .040 over and thought it may not be buildable, I may have it tanked and checked now. The 1970 AMX 390 remained at the same displacement by using a special rod and piston for this year only. Can also be used as stock replacement pistons. All three engine sizes (290, 343, and 390) share the same basic block design — the different displacements are achieved through various bore and stroke … This does not matter so much in a regular performance street build. Old K1 part number: 390-4000LB6B New number: 002AAD400 All AMC … Why build a hard-to-find 390 or 401 when the 360 grows on Jeeps? These pistons are for use in: Standard bore size 4.165 | stock 3.574 stroke | stock length 5.858 rod | stock size 1.000 wrist pin | 1.560 compression height | top ring groove 5/64 2nd ring groove 5/64 oil ring groove 3/16 | Step Dish 28cc | piston weight 532 grams | pin weight 157 grams. You wanna run a high boost power adder find a service block at 4.08 and run a smaller bore. 390/401 Available Bore Sizes 4.165, 4.185, 4.195 Add the bore size to the end of the part # IE. The 343 came out in 1967 and the "AMX 390" arrived in 1968.

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