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which pistons for my 440 for 9.3-9.5:1 with 80cc heads? #1370608 01/16/13 02:16 AM 01/16/13 02:16 AM
Joined: Feb 2007 Posts: 324 anacortes,wa 7 78asprin OP enthusiast
78asprin OP enthusiast 7 Joined: Feb 2007 Posts: 324 anacortes,wa	I'm putting together a 76 440 with a steel crank (stock stroke) +.030 with a set of 440 source stealth heads. They advertise 80cc chambers. Can someone help me figure out a set of pistons/rings to use for a comp ratio between 9.2-9.5:1? The combo will be used with an xe274 cam, roller rockers,performer rpm intake,4160 750cfm carb, and headers.thanks!

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 78asprin] #1370609 01/16/13 03:42 AM 01/16/13 03:42 AM
Joined: Aug 2003 Posts: 43,150 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,150 Bend,OR USA	With aluminum heads I would pump the compression up to 10.00 to 10.5. Try looking at KB Icon pistons or United Machine for the KB hypertutitec(SP?) pistons for that application Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 78asprin] #1370610 01/16/13 12:06 PM 01/16/13 12:06 PM
Joined: Jan 2003 Posts: 74,992 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,992 U.S.S.A.	A flat top at zero deck with 5cc valve reliefs , .041 thick gasket and 80cc heads comes in at 10.46. A 15cc dish/valve reliefs will bring it down to 9.5. What is your reason for wanting 9.0 -9.5 ?

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: JohnRR] #1370611 01/16/13 09:08 PM 01/16/13 09:08 PM
Joined: Feb 2007 Posts: 324 anacortes,wa 7 78asprin OP enthusiast
78asprin OP enthusiast 7 Joined: Feb 2007 Posts: 324 anacortes,wa	well its for a daily driven truck, running pump gas, didnt think i could go much more than that with pump fuel. id like to squeeze as much as i can without having to run any special fuel or anything.can i go higher than that because of the aluminum heads?

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 78asprin] #1370612 01/16/13 10:53 PM 01/16/13 10:53 PM
Joined: Aug 2007 Posts: 1,271 Vista, California 6 67Satty pro stock
67Satty pro stock 6 Joined: Aug 2007 Posts: 1,271 Vista, California	I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems. I plan on swapping on some Stealth heads when I get some more money and time and I think it will run fine with the smaller 80cc chambers and higher compression. If you get some TRW 2355 pistons that will get you close to zero deck and give you a workable compression ratio with the Stealth heads. Lots of people are going to say these pistons are too heavy, maybe there's something else someone can recommend that is as reasonably priced that will get you close to zero deck and a good ballpark compression.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 67Satty] #1370613 01/17/13 08:46 AM 01/17/13 08:46 AM
Joined: Jan 2003 Posts: 10,711 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,711 North Dakota	Quote: I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems.... Have you tried 87 octane just to see how the engine responds? "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 67Satty] #1370614 01/17/13 08:56 AM 01/17/13 08:56 AM
Joined: Jan 2003 Posts: 74,992 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,992 U.S.S.A.	Quote: I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems. If you had quench, and depending on the cam , you could have gotten away running a lower octane fuel.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 6PakBee] #1370615 01/17/13 08:58 AM 01/17/13 08:58 AM
Joined: Jan 2003 Posts: 74,992 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,992 U.S.S.A.	Quote: Quote: I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems.... Have you tried 87 octane just to see how the engine responds? It would be an interesting test , but I think he would have an issue without quench, unless he is at a higher altitude.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: JohnRR] #1370616 01/17/13 12:40 PM 01/17/13 12:40 PM
Joined: Aug 2007 Posts: 1,271 Vista, California 6 67Satty pro stock
67Satty pro stock 6 Joined: Aug 2007 Posts: 1,271 Vista, California	Quote: Quote: Quote: I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems.... Have you tried 87 octane just to see how the engine responds? It would be an interesting test , but I think he would have an issue without quench, unless he is at a higher altitude. Where I drive around town is pretty close to sea level, or actual sea level when I drive to the beach. Where I race 1/8 mile is at 1700 feet. I'll have a quench motor when I step up to some aluminum heads. Also going to change to a solid lifter cam but that's a different topic.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: JohnRR] #1370617 01/17/13 01:12 PM 01/17/13 01:12 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: If you had quench, and depending on the cam , you could have gotten away running a lower octane fuel. or run a faster (ign) curve for more power if you wanted to stay with 91 live every 24 hour block of time like it's your last day on earth

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: RapidRobert] #1370618 01/17/13 01:38 PM 01/17/13 01:38 PM
Joined: Aug 2007 Posts: 1,271 Vista, California 6 67Satty pro stock
67Satty pro stock 6 Joined: Aug 2007 Posts: 1,271 Vista, California	Yeah, that's what I'm doing.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 67Satty] #1370619 01/17/13 09:49 PM 01/17/13 09:49 PM
Joined: Feb 2007 Posts: 324 anacortes,wa 7 78asprin OP enthusiast
78asprin OP enthusiast 7 Joined: Feb 2007 Posts: 324 anacortes,wa	so would i be ok with say 10-10.5:1 compression on pump fuel then? 440 source says these heads have a quench area in them. im looking at the ross 82008 pistons, they seem to be fairly light weight and the price is right. what do u guys think?

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 78asprin] #1370620 01/17/13 09:56 PM 01/17/13 09:56 PM
Joined: Feb 2005 Posts: 4,313 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,313 Prospect, PA	10:1 yes. 10.5:1 maybe not.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: 78asprin] #1370621 01/18/13 01:27 AM 01/18/13 01:27 AM
Joined: Aug 2003 Posts: 43,150 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,150 Bend,OR USA	Quote: can i go higher than that because of the aluminum heads? Yes you can with aluminum(they suck more heat out of the combustion chambers than iron heads do ), usually by 1 full point My pump gas stroker has 10.78 to 1, I run Oregon 91 octane, non ethanol, pump gas, 9.97 ET at 134.6 MPH at 3450 lbs through the muffs with the air cleaner on motor only I have a wideban on my car, I run it a little lean on the air fuel ratio, 13.3 to 13.5 at WOT and I have no signs of detoonation on the spark plugs or in the motor I've raced it at sea level, even with the D.A. 800 ft. below sea level and it runs fine on the local pump swill with that compression ratio IHTHs Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: Cab_Burge] #1370622 01/18/13 01:45 AM 01/18/13 01:45 AM
Joined: Feb 2007 Posts: 324 anacortes,wa 7 78asprin OP enthusiast
78asprin OP enthusiast 7 Joined: Feb 2007 Posts: 324 anacortes,wa	Sweet deal! Damn that sounds like u have quite the setup!

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: Cab_Burge] #1370623 01/18/13 08:19 AM 01/18/13 08:19 AM
Joined: Feb 2005 Posts: 4,313 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,313 Prospect, PA	Cab, be careful on what you put out there as it sounds like the OP is kanda new to some of the technical aspects. I don't know if you meant it or not, but is sounds like your telling him he can run 10.8:1 CR because you can. Just not worth directing a guy to be potentially a couple of tenths to high vereses leaving a couple on the table. Last edited by BSB67; 01/18/13 08:20 AM.

Re: which pistons for my 440 for 9.3-9.5:1 with 80cc heads? [Re: BSB67] #1370624 01/18/13 11:04 AM 01/18/13 11:04 AM
Joined: Jan 2003 Posts: 74,992 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,992 U.S.S.A.	Quote: Cab, be careful on what you put out there as it sounds like the OP is kanda new to some of the technical aspects. I don't know if you meant it or not, but is sounds like your telling him he can run 10.8:1 CR because you can. Just not worth directing a guy to be potentially a couple of tenths to high vereses leaving a couple on the table. OP shoot for 10 for your application and you will be safe and not disappointed.

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