Car Craft
Click here to find out more!

Build an AMC

What to Do When You Can't Find an AMX or SST

Photography by , The Primedia Archives

We wanted a Javelin bad. So we got all squinty and slack-jawed when we found a bunch of other Javelin guys on eBay bidding our Big Bad Blue '691⁄2 Go Pack dream car to death. Losing that auction got us thinking about the "wrong year" Javs and Ramblers we could buy cheap and plumb with beefed AMC running gear. Since our requisite engine for any AMC street machine is the 401, we went looking for alternative body styles that weren't coveted or even marginally collectible so we wouldn't feel guilty about yanking the stock engine for a big-cube swap-o. We didn't rule out the larger but still kick-butt Ambassador series or the Rebel, the big 'ol Marlin, or even the gas-crunch stuff from the '70s. We looked at models built after 1965, because stuff before that was just weird, and before 1977 when the Concord hustled in the age of the luxury compact that led to the ultimate demise of the auto division. Ugh.

So here's the deal: We dug up some archive photos of the cool musclecar-era body styles and listed some of the parts, tips, and tricks we found in our AMC fervor. There is way more information available than we can put in this story. So consider this a primer on what is possible. We're still trying to decide which one is coolest, so if we score a roller, we'll unite it with a screamin' mill and let you know.

Body Styles
Like we said, the dream was buying a '68-'69 Javelin SST or AMX with a four-speed and either the 343ci or 390ci engine. Great cars, but we couldn't even find a rusty one that would make a good base for a street machine. Everything we found was either restored and expensive or returning to ore. During our search, we did find some Rambler Americans that came equipped with the small V-8s from the 290-360 family. Since the external engine dimensions are the same as the 401, a swap would be easy and their light weight would make them fly. We also found several of the less-coveted '71-'74 Javelins at reasonable prices and a Rambler Rebel SST convertible. Many of these cars were for sale for less than $4,000. Check out the cool bodies and consider the options.

Engines
All 290-401 AMC V-8s after 1966 are in the same family. But just because the 390-401s have the same dimensions as the smaller 290-360 engines doesn't mean you can bore and stroke your way to any cubic-inch displacement with any block. There are differences internally. The most notable is the switch from 7⁄16-inch head bolts to 1⁄2-inch head bolts and the deck height increase from 9.175 to 9.208 inches in 1970. This is actually OK because most of the aftermarket parts we've found are designed for post-'70 401s found in fullsize AMC passenger cars until 1974 and in fullsize Jeeps through 1978, making them more plentiful than the early engines.

Rearends
Most of the AMC V-8 cars were saddled with the ill-reputed 87⁄8 Model 20 rearend. The problem has always been that the axle is a separate component from the hub. To make matters worse, the axle uses a Woodruff key instead of splines, creating a potential to spin the axles in the hub and snap the key. Short of changing rearends, the fix we've seen used universally is a Detroit Soft Locker, Auburn differential, or similar design with a Moser one-piece 29-spline axle to put up with the abuse. If you're going racing with 500 hp or more and launching hard on slicks, there are Dana 60 and Ford 9-inch bolt-in housings available. Otherwise, upgrade the 20 and leave it alone.

Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
2 comments
zynkangel
zynkangel

the car in james bond was a amc hornet

knightjp
knightjp

I never knew AMC existed until I saw Man with a Golden Gun. I wondered what kind of car he did that stunt in. It had such as awesome V8 sound... :)This is a forgotten brand in the public eye and the AMC V8, a forgotten engine.

Car Craft