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Re: Six pac pistons
[Re: Roughbird72]
#2867419
01/01/21 11:43 AM
01/01/21 11:43 AM
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Joined: Jan 2003
Posts: 2,863
middle Tennessee
mopower440
master
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master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
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They are REAL HEAVY pistons.... EZ pull weight out of them with big end mill OR EVEN a big drill bit using a good drill press. I remember getting my balance card back when I used a set of the SP 6pk pistons my first build  is there enough 'meat' on the 2355 pistons that can be removed to lighten them to a decent level? Asking because i also use them..
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Re: Six pac pistons
[Re: mopower440]
#2867443
01/01/21 12:23 PM
01/01/21 12:23 PM
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Joined: Feb 2013
Posts: 144
Missouri
randavis
member
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member
Joined: Feb 2013
Posts: 144
Missouri
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Years ago, I had .125" milled off the top of some Sealed Power 2350P pistons to lower the compression. After milling, those pistons weighed 1023 grams with pins. That engine ran for about 30,000 miles. I don't know how much different the 2355's are.
I'm finally retiring that engine. I am having a 499 built.
74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI.
New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.
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Re: Six pac pistons
[Re: randavis]
#2867532
01/01/21 01:51 PM
01/01/21 01:51 PM
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Joined: Jan 2003
Posts: 2,863
middle Tennessee
mopower440
master
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master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
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Years ago, I had .125" milled off the top of some Sealed Power 2350P pistons to lower the compression. After milling, those pistons weighed 1023 grams with pins. That engine ran for about 30,000 miles. I don't know how much different the 2355's are.
I'm finally retiring that engine. I am having a 499 built. what happened at 30,000 miles? Did it give out or was it still going fine?
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Re: Six pac pistons
[Re: mopower440]
#2867536
01/01/21 01:57 PM
01/01/21 01:57 PM
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Joined: Jul 2008
Posts: 30,438
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,438
Florida STAYcation
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They are REAL HEAVY pistons.... EZ pull weight out of them with big end mill OR EVEN a big drill bit using a good drill press. I remember getting my balance card back when I used a set of the SP 6pk pistons my first build is there enough 'meat' on the 2355 pistons that can be removed to lighten them to a decent level? Asking because i also use them.. I lightened a set meself and had a set Bridgeported ... dont remember the weight saving but it was substantial
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Re: Six pac pistons
[Re: dOc !]
#2867600
01/01/21 02:58 PM
01/01/21 02:58 PM
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Joined: Jan 2004
Posts: 8,282
fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,282
fredericksburg,va
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Which one is more the culprit, the heavy rod or piston. I’ve been advised to use the reg rod with a big weight savings.
Sox did the drag test in a 69 lift off (stock 440 with six-pac intake and cam) but did anyone do a test in a 70 with the hc pistons and big rods to see which was faster?
Last edited by cudaman1969; 01/01/21 03:02 PM.
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Re: Six pac pistons
[Re: dOc !]
#2867602
01/01/21 02:59 PM
01/01/21 02:59 PM
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Joined: Oct 2015
Posts: 570
UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Back in 1988 we internally balanced my 1968 factory six-pck block with std. damper. replacement +.030" Pistons weighed 900gms and the rods 1100, is all I remember...was race use only...
Last edited by rb446; 01/01/21 03:00 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Six pac pistons
[Re: mopower440]
#2867706
01/01/21 06:57 PM
01/01/21 06:57 PM
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Joined: Feb 2013
Posts: 144
Missouri
randavis
member
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member
Joined: Feb 2013
Posts: 144
Missouri
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It had a miss the last time I drove it. Checked the passenger side compression and 2, 4, and 6 had 90#, 8 had 150#.
I put a Sniper on the car last year and I think that experimenting with AFR and timing, I may have broken some rings.
The car seemed to rev quicker with the lightened pistons. Almost like a small block.
74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI.
New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.
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