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401 pistons in an early 390 |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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I didn’t know they were offering 390 pistons these days, they must be relatively new. I could do a set of larger chamber heads, which I should have in stock. I’d rather not though because 291s I have were done by Adkins and they have decent parts in them. I’d rather pop for custom positions to get exactly what I need. I don’t want to end up with a pinger, that’s no fun. There is a good chance the block only need to go .20 over, if rings are easy enough to find that may be worth the aggravation of going custom. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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Andy, I'm glad to see you reconsidered selling your SC/R and are getting back into it. It'll be a great winter project.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1719 |
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the Wiseco "390 pistons" are for a 70. 1.553 compression height if memory serves.
Nothing wrong with your original plan. Yes, pistons down in the hole are not optimum but a 390 starts out farther down in the hole than your 401 pistons will be. Stick to your plan. |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6882 |
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These people make a proper 390 piston. I'm sure you could custom order the CR you desire. I've only had one set of their pistons in hand, but they are equal if not better then Wiesco's.
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wrebelmachine
AMC Apprentice Joined: Aug/08/2019 Location: SW Missouri Status: Offline Points: 162 |
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x2 on the DSS Pistons
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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RaceTech and Diamond will make you exactly what you want as well. I buy a lot of RaceTec pistons. It usually takes about 3 weeks to get them.
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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Thanks Roger, I don’t think I will be able to dig into the welding until the spring. But the more small projects I can knock off the list the better. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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Thanks for all the info guys, looks like I got some thinking to do. Just looked at the order form on Diamonds website, there was a lot of questions I couldn’t answer. Lol. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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garland performce
AMC Apprentice Joined: Nov/19/2013 Location: sibley mo Status: Offline Points: 172 |
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Yes .020 rings are .060 400 sbc can get several ring packs
I`m a race tech dealer if I can help you give me a call at the shop Monday -Friday 7 to 4 816-547-5695 John Garland
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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On the Wiseco website the last time I looked recently the catalog has a typo error for the AMC 390 Piston Compression Height that is incorrect, even called them and they confirmed. Maybe some day the online information will get updated.
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