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I am finally assembling the AMC 401 to replace the 304 in my 1978 CJ5, and I have two questions related to holes.

(1). I see a hole on the passenger side of the block that I neither know what is...

One additional thought. I read elsewhere that AMC 401 OEM crankshaft snout diameter can range from 1.3618" to 1.3628" (with most being 1.3628"), and the OEM balancer bore can range from 1.3603" to...

I assume by your reply that the firts 1.5'' of the crankshaft snout is tapered; which is supposed to provide a slip fit that would allow one to rotate the balancer to align with the crank key and to...

I am having problems aligning my 401 balancer keyway with the crankshaft key. I have a rebuilt OEM vodka nicer from damperdoctor. The key does not extend to the end of the crankshaft and due to the...

My amc 401 is in the machine shop to have the bottom end rebuilt. I need a flywheel for use with the manual transmission in my CJ5. I do not want to pay for a billet one from Hayes or centerforce;...

I am looking for a reliable automotive machine shop in the Houston, Texas area (preferably Cypress, Spring, or Tomball). I have an AMC 401 that requires not tanking cleaning, machine block, machine...

I am looking for a pair of heads for my 401 rebuild. I have a set of bridged-rocker heads , but I would really like to use a pair of the individual-rocker style heads. They do not have to be "291c"...

I am looking to purchase a set of 291c (51cc) heads for my 401 build. I am looking for 9.5:1 CR for my build. I could go slightly higher, but I want to still run on pump gas (premium would be...

Thanks for the reply. I know this jeep has the Iron duke, but it does have the T176. I have a T176/T18 bell housing (with the special d-stud for the t18 if I ever want to rebuild and install the...

I have an AMC 401 that I am building for my CJ project. I have my eye on a 1982 CJ7 with factory drivetrain (Iron Duke I4, T-176, Dana300) for swapping the AMC 401 into.

Does anyone know the...