Help me pick pistons for my 360.
#2114337
07/20/16 08:59 PM
07/20/16 08:59 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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I am currently running KB hyperutectic piston with a -1.20cc domed piston head and a 1.675" compression distance. I'm running the basic fel pro blue head gasket I believe it's .039"compressed thickness with at a 4.180" bore. My engine currently has a 4.030" bore with stock open chamber iron heads. I have a bad wrist pin in cylinder 6 with a little scorning on the wall but the compression is still good so I might have to go 4.040" bore. I want to go to a forged piston this time around. I'm figuring I'm at 10.5-11ish compression wise with my current set up and want to stay as close to that as possible. What forehead piston/ head gasket combo will keep me close to my desired compression? I have some ideas but would like others input as I am no pro at this. Has anyone heard of DSS racing Pistons? I'm interested in their -5.00cc pistons. I'm also interested in the SRP & Icon flat tops.
Last edited by moparjoe360.4; 07/20/16 09:12 PM.
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2114375
07/20/16 09:58 PM
07/20/16 09:58 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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The heads I will be running are aerohead iron 974 castings with a 2.02 intake valve,a homebrew port job, and open chamber. I'm not sure on the cc of the camber as they don't list that and I haven't checked them. They should be in the 68-70cc I would assume.
Last edited by moparjoe360.4; 07/20/16 09:59 PM.
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Re: Help me pick pistons for my 360.
[Re: A/MP]
#2114491
07/21/16 12:56 AM
07/21/16 12:56 AM
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Joined: Feb 2005
Posts: 20,203 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,203
PA.
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I wish you were in need of a set of .060 over high compression pistons as I have 2 sets sitting here. Guys want them but have no money
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Help me pick pistons for my 360.
[Re: pittsburghracer]
#2114501
07/21/16 01:09 AM
07/21/16 01:09 AM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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I wish you were in need of a set of .060 over high compression pistons as I have 2 sets sitting here. Guys want them but have no money How high of compression are they? Are they the Wiscos you have listened here? I did remember seeing you had some listed. I still have stock 3.58 stroke too.
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2114514
07/21/16 01:38 AM
07/21/16 01:38 AM
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Joined: Feb 2005
Posts: 20,203 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,203
PA.
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Hoping to take some parts to monster mopar. I will check my Stash tomorrow
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2114528
07/21/16 02:19 AM
07/21/16 02:19 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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I'm running the basic fel pro blue head gasket I believe it's .039"compressed thickness with at a 4.180" bore. My 8553PT's compressed from .059" to .051". 4 & 3/16 bore (didn't have my calipers nearby for the bore dia measurement but does correlate with your 4.180 dimention).
live every 24 hour block of time like it's your last day on earth
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Re: Help me pick pistons for my 360.
[Re: A/MP]
#2114647
07/21/16 11:19 AM
07/21/16 11:19 AM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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If you are running under 6300-6500 rpms go with a KB piston and opt for the higher compression( I think they are the 190). The KB's are closely matched for stock balancing. You probably won't find that with a forged piston. You'll need to pay for the rebalancing. I don't think you will be making any power beyond 6000 rpms with those heads. I'm running the KB190 currently and I believe the wrist pin hole is the point of failure. That's what I'm replacing them. They have roughly 25k mi and hundreds of passes on them. The majority of use for the engine is at the track nowadays, so I need toughness and reliability.
Last edited by moparjoe360.4; 07/21/16 11:23 AM.
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2114838
07/21/16 02:48 PM
07/21/16 02:48 PM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
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I had a .040 360 block that was rebuilt and had a wrist pin failure, too. Just yesterday it left on the scrap truck, it had a deep groove in #5 and would not clean at .060. It was a 1977 block and might have been savable if it were an early block. I bought a set of 273 rods that have been bushed for floating pins from a Moparts member. I plan to use those in my 1990 roller block when I get around to machining it, it had standard bore pistons in it and almost no ridge. I will need some very light pistons to go with this build and would like to see 9 to 1 compression and maybe a 4" crank.
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2115080
07/21/16 08:43 PM
07/21/16 08:43 PM
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Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
mopar
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mopar
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that X deal looks like snake oil.
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: Help me pick pistons for my 360.
[Re: moparjoe360.4]
#2115123
07/21/16 09:46 PM
07/21/16 09:46 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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The best "deal" is probably some wiseco/pro true pistons..... They come with rings.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Help me pick pistons for my 360.
[Re: fast68plymouth]
#2115352
07/22/16 09:36 AM
07/22/16 09:36 AM
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Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
super stock
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super stock
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The best "deal" is probably some wiseco/pro true pistons..... They come with rings. I'd go for these myself--SBM670040F05 Mahle Motorports, they come with rings as well. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
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Re: Help me pick pistons for my 360. Updated with pictures.
[Re: moparjoe360.4]
#2118308
07/26/16 05:34 PM
07/26/16 05:34 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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Here is the reason I need new pistons. I really don't think that they should fail like this after 25k mi. Even with a few hundred passes.
Last edited by moparjoe360.4; 07/26/16 06:42 PM.
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Re: Help me pick pistons for my 360.
[Re: Discoquik]
#2118770
07/27/16 01:11 AM
07/27/16 01:11 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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That would be detonation that blew the ring land off that part. What timing are you running and octane fuel? Agreed, be sure to solve that (more octane, maybe slightly stiffer springs) before you fire up the rebuild.
live every 24 hour block of time like it's your last day on earth
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Re: Help me pick pistons for my 360.
[Re: Medlock51]
#2118844
07/27/16 06:31 AM
07/27/16 06:31 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
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master
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Racetec can build anything you need at a good price... I like dealing with the guys that build the parts not just resellers like Summit/ Jegs, etc. Give em a call. racetec pistons use a smaller metric ring stack.. KB hypereutectic required larger top ring gap...
Last edited by 70AARcuda; 07/27/16 06:36 AM.
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Help me pick pistons for my 360.
[Re: L4staero]
#2118871
07/27/16 09:10 AM
07/27/16 09:10 AM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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What top ring gap were you running? Ive pulled ring lands off like that when i have messed up the ring gap and had it too tight I honestly can't remember as I built this 10 years ago. I do know I ground them to KB spec but can't remember the exact gap. Would a stiffer spring really help? I've never heard of that coming into play but I don't claim to know everything. I am replacing the springs, and heads for that matter. I've got a pair of aerohead reman heads with 2.02s and .509 lift springs that will be going on this time around. I've also got a MP 292 .508 purple shaft that's going in too.
Last edited by moparjoe360.4; 07/27/16 09:31 AM.
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Re: Help me pick pistons for my 360. Updated with pictures.
[Re: moparjoe360.4]
#2118873
07/27/16 09:15 AM
07/27/16 09:15 AM
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Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
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super stock
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Here is the reason I need new pistons. I really don't think that they should fail like this after 25k mi. Even with a few hundred passes. You butted the rings which blew the ring land off. Your end gap must have been correct or close to run 25,000 miles though. You were running hot with borderline fuel or just didn't lift when it was rattling. Was your top ring @ .026-.028"? You won't beat the Mahle's with their tighter than normal clearances for a forging. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
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Re: Help me pick pistons for my 360. Updated with pictures.
[Re: RAMM]
#2119295
07/27/16 07:57 PM
07/27/16 07:57 PM
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Joined: Feb 2012
Posts: 394 Ohio
moparjoe360.4
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Here is the reason I need new pistons. I really don't think that they should fail like this after 25k mi. Even with a few hundred passes. You butted the rings which blew the ring land off. Your end gap must have been correct or close to run 25,000 miles though. You were running hot with borderline fuel or just didn't lift when it was rattling. Was your top ring @ .026-.028"? . You hit the nail on the head, on the way to the track we got off the e-way and the truck was HOT I got on the throttle to blow the carbon out after the extended cruise, it rattled and I didn't lift as quick as I normally do. I'm sure that's when the I poped that chunk loose. I should have known it would rattle after the hour or so of 70 mph at 34-3700rpm. Live and learn I guess.
Last edited by moparjoe360.4; 07/27/16 07:59 PM.
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