TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - 1970 390 piston choices
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

1970 390 piston choices

 Post Reply Post Reply Page  <12
Author
Message
440sixpack View Drop Down
AMC Nut
AMC Nut


Joined: Feb/23/2012
Location: Oregon
Status: Offline
Points: 481
Post Options Post Options   Thanks (0) Thanks(0)   Quote 440sixpack Quote  Post ReplyReply Direct Link To This Post Posted: Mar/09/2012 at 10:26pm

 If your detonation is bad enough to take out a piston you  need to do something about it .  no piston will take it forever,  granted forged will last the longest.

 This pretty much covers it.
 
Back to Top
smills61074 View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Feb/05/2011
Location: savanna, il
Status: Offline
Points: 270
Post Options Post Options   Thanks (0) Thanks(0)   Quote smills61074 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/10/2012 at 9:21pm
Are the bulltears made in chna?  If I go with a 401 crank, will my pistons still be down in the hole?  I am taking my block to the machine shop this week.  Once it is boiled and magnifluxed, I will know if I have to go oversize with the pistons.  Everyone, thanks for your help.
Back to Top
74Bubblefender View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jun/29/2007
Location: The AMC form
Status: Offline
Points: 2589
Post Options Post Options   Thanks (0) Thanks(0)   Quote 74Bubblefender Quote  Post ReplyReply Direct Link To This Post Posted: Mar/10/2012 at 10:00pm
China...heck no. Zero deck is what you want with a nice shaped D-dish
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564
Back to Top
amx39068 View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar

Joined: Feb/21/2008
Location: Arizona
Status: Offline
Points: 11576
Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/10/2012 at 10:05pm
Custom pistons are just that, custom. You can have them made to fit your specfic engine's deck, bore and valve relief to have whatever compression you want.
Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
Back to Top
440sixpack View Drop Down
AMC Nut
AMC Nut


Joined: Feb/23/2012
Location: Oregon
Status: Offline
Points: 481
Post Options Post Options   Thanks (0) Thanks(0)   Quote 440sixpack Quote  Post ReplyReply Direct Link To This Post Posted: Mar/11/2012 at 9:06am
Dan is correct don't have it in the hole that's a sure prescription for trouble, Bulltear will take your specs and make sure you are flat . 
 
 You didn't say if you have a standard bore or not, if you're headed to a .60 over  like I have to go you better have your shop sonic the block before you go any deeper.  I guess AMC can have a little core shift too.
 
 
There are lots of good pistons out there but when you can just make a phone call and get a set of american made customs to fit your needs  for $600 it's a no brainer for me.
Back to Top
smills61074 View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Feb/05/2011
Location: savanna, il
Status: Offline
Points: 270
Post Options Post Options   Thanks (0) Thanks(0)   Quote smills61074 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2012 at 8:52pm
It appears everyone seems to recommend forged.  I guess I will have to wait until I get my block checked out at the machine shop,  Then I will know what size I will need.
Back to Top
401MATCOUPE View Drop Down
AMC Addicted
AMC Addicted


Joined: May/20/2010
Location: Salisbury, MD
Status: Offline
Points: 5368
Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2012 at 4:07pm
The Chief Piston Designer at Keith Black is a fellow Studebaker Enthusiast, he has 40 plus years of internal combustion engine experience and Custom Build Pistons for the Studebaker folks all in Hyperutectic Design.  He has told me that the biggest failure issue is wrong ring gap for application.  The old .004" of end gap per inch of bore size does work on all applications. Alot of Studebakers are factory supercharged and high output (10 psi plus), using these pistons but with a larger end gap.  If you go to the Keith Black Catalog there is a great deal of info there that can be used on our AMC Performance Engines.  If you want to build a performance engine using a supercharger, turbo or nitrous, KB can give some great advise.....give John Erb a call, he is an unbelievable mountain of information.  He has been involved in 304 CID Studebakers at the Salt Flats going 200+ MPH and holding the record.  Sorry for the Brand X Orphan Car references, but if they can make that kind of power so can a "Modern AMC V-8's".
Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar)
68X,GoPac,390,4sp,52A
69X,GoPac,390,4sp,64A
70X,GoPac,390,4sp,87A,8
70X,GoPac,390,4sp,BBO,8
70 Jav SST,390,AT,BSO
74MatX,401,AT,Prototype
74MatX,401,AT
Back to Top
 Post Reply Post Reply Page  <12
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.156 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or