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RE: Gently stroking my 390
By KarlJay - 03/22/2001 11:58:30 AM; IP 63.169.132.219
The post said that some company was buying L2291F (forged 390 pistons) and cutting them down for use with the 428 crank. I did this myself, I bought a 390 kit and found a 428 crank and didn't want to buy new pistons so I used the new 390 pistons. I had them measured and the top had just over 1/2" material on them and so I had the machine shop cut about .1 off them.
I polished the chambers out to about 80.5cc and ended up with about 205 cranking compression before break in. The real down side is that with this setup, you might end up with more compression than you want. I wanted about 9.25 and got about 10.25 but true custom pistons cost big $$ and these are good strong pistons.

By the way, I ended up 99.1% the size of a stock 428 and the torque is great. Don't forget about external balancing, the 410/428 are require a different flywheel and the whole thing needs to be balanced.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=5651&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5651" onclick="return false;">Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>Jeff, <i>03/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5651', contentMargin: 60, icon: $('anchor5651') }); </script>  Gently stroking my 390 -- Jeff, 03/21/2001
 Re:410! -- Mike McQuesten, 03/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5658&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5658" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>ANDY, <i>03/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5658', contentMargin: 60, icon: $('anchor5658') }); </script>  RE: Gently stroking my 390 -- ANDY, 03/22/2001
RE: Gently stroking my 390 -- KarlJay, 03/22/2001
 RE: Gently stroking my 390 -- Paul, 03/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5688&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5688" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>410cougar, <i>03/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5688', contentMargin: 60, icon: $('anchor5688') }); </script>  RE: Gently stroking my 390 -- 410cougar, 03/23/2001
 I love when people call'em chrome moly rings. nm -- Neppy, 03/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5709&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5709" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>Jeff, <i>03/25/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5709', contentMargin: 60, icon: $('anchor5709') }); </script>  RE: Gently stroking my 390 -- Jeff, 03/25/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5713&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5713" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>410cougar, <i>03/26/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5713', contentMargin: 60, icon: $('anchor5713') }); </script>  RE: Gently stroking my 390 -- 410cougar, 03/26/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5716&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5716" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>Jeff, <i>03/26/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5716', contentMargin: 60, icon: $('anchor5716') }); </script>  RE: Gently stroking my 390 -- Jeff, 03/26/2001
Collapse <a href=../ForumFE/reply.aspx?ID=5728&Reply=5651><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor5728" onclick="return false;">RE: Gently stroking my 390</a>&nbsp;-- <font color=#0000ff>bear, <i>03/27/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=5728', contentMargin: 60, icon: $('anchor5728') }); </script>  RE: Gently stroking my 390 -- bear, 03/27/2001
 RE: Gently stroking my 390 -- Jeff, 03/27/2001
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