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401 pistons in an early 390

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brownspirit View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote brownspirit Quote  Post ReplyReply Direct Link To This Post Posted: Nov/29/2020 at 8:49pm
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  
69' BBB AMX 390/4-speed

69' s/crambler project

69’ International F210d Cummins/5+4
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6PakBee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 9:22am
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.
Roger Gazur
1969 'B' Scheme SC/Rambler
1970 RWB 4-spd Machine
1970 Sonic Silver auto AMX

All project cars.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote BassBoat Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 10:29am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 11:59am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote wrebelmachine Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 12:08pm
x2 on the DSS Pistons
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SC397 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 3:13pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brownspirit Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:18pm
Originally posted by 6PakBee 6PakBee wrote:

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.

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
69' BBB AMX 390/4-speed

69' s/crambler project

69’ International F210d Cummins/5+4
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brownspirit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brownspirit Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:23pm
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
69' BBB AMX 390/4-speed

69' s/crambler project

69’ International F210d Cummins/5+4
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garland performce Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:57pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Dec/01/2020 at 5:24am
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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