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401 amc,help me build a street stip motor! #1134806
12/15/11 07:42 PM
12/15/11 07:42 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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A friend of a friend has asked for my help on making his 68 AMX into a great street strip cruiser, with emphasis on street. I may know something about BB mopes ,but I can use a lot of help here. Heads, easiest Big shortblock build, intake, cam, headers, you name it.Thanks in advance!
His desire is a very tractable motor, so my guess is it should be built with torque coming in strong down around 2400 rpm or so, which in my mind dictates a dual plane intake like a performer RPM. Budget is somewhere around $7,000. What ya got for ideas? Also, do you have a favorite engine bulder in the Minneapolis Mn metro that does great work on the AMC motor?

Last edited by gregsdart; 12/15/11 07:45 PM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: 401 amc,help me build a street stip motor! [Re: gregsdart] #1134807
12/15/11 07:51 PM
12/15/11 07:51 PM
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Joplin, Mo
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rt66jim Offline
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Joplin, Mo
Greg Indy has the block and heads to build a 500 CI aluminum motor.

Re: 401 amc,help me build a street stip motor! [Re: gregsdart] #1134808
12/15/11 08:53 PM
12/15/11 08:53 PM
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Posts: 1,141
Phoenix,Az.
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hemicop Offline
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A friend here is a real AMC nut & just sold his 10-sec. (no NOS) street, 360 AMC to a guy in Vegas. If I were building an AMC I'd definitely use him. PM me if you want his number...

Re: 401 amc,help me build a street stip motor! [Re: rt66jim] #1134809
12/15/11 10:41 PM
12/15/11 10:41 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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gregsdart  Offline OP
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Thanks, guys. Need to stay in about the $7,000 range, want to keep the whole project local if at all possible. I am going to strongly encourage that the motor be dynoed, preferably by the shop that puts it together.
After looking up Edelbrocks offerings, their RPM package looks pretty good. Performer RPM heads, RPM air gap intake, Edelbrock 800 carb to top it off. RPM cam specs are 234/244/112 duration, .520 intake lift, .544 exhaust lift.
Any input on this package, or others, appreciated.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: 401 amc,help me build a street stip motor! [Re: gregsdart] #1134810
12/16/11 08:45 AM
12/16/11 08:45 AM
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United Socialist States of Ame...
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tboomer Offline
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Greg..How far are you from Jerry at Sharadon? Maybe he could help you?


The end is near.....
Re: 401 amc,help me build a street stip motor! [Re: tboomer] #1134811
12/16/11 09:26 AM
12/16/11 09:26 AM
Joined: Dec 2006
Posts: 235
Tucson AZ.
RADAMX Offline
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Tucson AZ.
The Indy 401-sr heads flow better than the Edelbrock heads and for that I would use the air gap intake .
Also if you offset grind the crank to " SB chevy rods" it makes it a engine which has proven to be a reliable power house
it is not to hard to build 500+ hp and 500+ ft torque in a very street oriented build
Parts are available to go from mild to 1000 + hp so have fun.
they have even started makeing HYD roller lifters for the AMC

Last edited by RADAMX; 12/16/11 09:49 AM.
Re: 401 amc,help me build a street stip motor! [Re: RADAMX] #1134812
12/16/11 09:37 AM
12/16/11 09:37 AM
Joined: Dec 2006
Posts: 235
Tucson AZ.
RADAMX Offline
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Also what transmission ? If you are going to run a torqueflite you needs to have a 72 or newer crank or you will need to machine the back of the crank to except the convertor snout. better to do it now than figure it out later.
Hooker super headers comps hang pretty low so try to avoid then if possible.

Re: 401 amc,help me build a street stip motor! [Re: RADAMX] #1134813
12/16/11 01:32 PM
12/16/11 01:32 PM
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Quicktree Offline
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unless he is hell bent on keeping it AMC I would switch to a SB mopar. lot better choices out here and more parts available

Re: 401 amc,help me build a street stip motor! [Re: Quicktree] #1134814
12/16/11 03:12 PM
12/16/11 03:12 PM
Joined: Oct 2006
Posts: 149
Cleveland Ohio
Discoquik Offline
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Cleveland Ohio
Wiseco has 401 pistons on the shelf as well as K1 rods 4340 H beams too.

Re: 401 amc,help me build a street stip motor! [Re: Discoquik] #1134815
12/16/11 05:02 PM
12/16/11 05:02 PM
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dogdays Offline
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The AMC 401 is gold. People pay top dollar. AMC owners tend to be rabidand would never accept a Mopar engine in an AMX.

Bore spacing is I believe 4.5625, deck height is 9.208, rod length 5.858 bore 4.165 stroke 3.68. The forged crank can be stroked to around 3.8 using chevy smallblock rods and piston size is around chevy 400 smallblock. Some pretty workable combinations come to mind. Also as mentioned above there are now two different aluminum heads to choose from.

It'll cost more because it's not a smallblock chevy, it's more like rodding a 350 olds which is pretty comparable in dimensions.

R.

Re: 401 amc,help me build a street stip motor! [Re: dogdays] #1134816
12/16/11 05:48 PM
12/16/11 05:48 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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gregsdart  Offline OP
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Thanks again, lots of info. This turned out to be a 1970 year 390 (thought it was a 360) so sticking with the 390 seems to be the logical choice. Four speed car, just like I want some day. Thats kinda why I got involved with the project. At this point it looks like he wants to have the stock heads ported, and work from there. That will make choices a lot easier.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: 401 amc,help me build a street stip motor! [Re: gregsdart] #1134817
12/17/11 12:25 AM
12/17/11 12:25 AM
Joined: Dec 2006
Posts: 235
Tucson AZ.
RADAMX Offline
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Tucson AZ.
Being a 70 is a good thing the head bolts are 1/2 where the earlier ones were 7/16.
it also has a taller deck .
and better exhaust ports. stock heads can build around 600 hp with the right cam and short block. 500 hp is easy to build. If he plans on running the T-10 he needs to start looking for a scattersheild now as the lakewood is discontinued. I think they make quicktime bells for the t-10 you would have to check.







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