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Are stock HP273 pistons forged or cast? #466747 09/13/09 12:28 AM 09/13/09 12:28 AM
Joined: Aug 2008 Posts: 21 Iowa T toolmanmike OP member
toolmanmike OP member T Joined: Aug 2008 Posts: 21 Iowa	I have heard conflicting stories but have never seen anything in print. Are the factory 10.5:1 Hp273 pistons forged or cast? How heavy are they? Thanks, toolmanmike

Re: Are stock HP273 pistons forged or cast? [Re: toolmanmike] #466748 09/13/09 12:33 AM 09/13/09 12:33 AM
Joined: Jan 2003 Posts: 43,539 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,539 Round Lake Beach, Illinoisy	I have a couple 67 273 4-bbl engines apart and they are definitely forged and heavy! I also have a set of replacement forged pistons .030 over and they are real heavy! The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: Are stock HP273 pistons forged or cast? [Re: Rhinodart] #466749 09/13/09 01:42 AM 09/13/09 01:42 AM
Joined: Jan 2003 Posts: 3,504 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,504 DFW	I never had a 235HP 273, but my old 2bbl 273 had really thick wall pins. I don't remember the pistons being overly heavy (by Chrysler standards), but the pin had about .300" thick wall. I think they did that to keep the same balance as a 318 piston and pin. It would make the assembly line easier if they could balance all the cranks the same. Floyd Lippencott IV

Re: Are stock HP273 pistons forged or cast? [Re: Rhinodart] #466750 09/13/09 11:32 AM 09/13/09 11:32 AM
Joined: Feb 2003 Posts: 16,145 Mesa, Arizona D dart4forte I Live Here
dart4forte I Live Here D Joined: Feb 2003 Posts: 16,145 Mesa, Arizona	Quote: I have a couple 67 273 4-bbl engines apart and they are definitely forged and heavy! I also have a set of replacement forged pistons .030 over and they are real heavy! Are you sure you don't have the L2222 TRW Forged pistons. Every HP 273 I've torn apart had the 10.5 cast piston. Also, there is a secret to lightening the HP piston. Also as a note: EGGE shows a 4 barrel piston with the L2222 part number. However, after calling them I find that the piston they offer is the cast replacement piston. Really hard to find forged pistons for the 273 without going with the major manufacturers since their pistons are custom made and run around $600-$800 a set.

Re: Are stock HP273 pistons forged or cast? [Re: dart4forte] #466751 02/06/10 12:47 AM 02/06/10 12:47 AM
Joined: Aug 2008 Posts: 21 Iowa T toolmanmike OP member
toolmanmike OP member T Joined: Aug 2008 Posts: 21 Iowa	I bought a set of the Egge 10.5/1 pistons. They are cast and come with pins and clips. The +.030's are about 60 grams lighter than the stock standard bore slugs so I balanced the rotating assembly. They were all within a half a thousandth of the same size. Good stuff! Mike 5785649-09_24_0.JPEG (147 downloads) Last edited by toolmanmike; 02/06/10 12:50 AM.

Re: Are stock HP273 pistons forged or cast? [Re: toolmanmike] #466752 02/06/10 01:28 AM 02/06/10 01:28 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	they are cast and as said the pins are very heavy so the 273 piston/pin assy will weigh the same as the 318 piston/pin assy even w the smaller dia (& therefore lighter) 273 pistons so the balancing bobweight is the same. live every 24 hour block of time like it's your last day on earth

Re: Are stock HP273 pistons forged or cast? [Re: RapidRobert] #466753 02/06/10 09:42 AM 02/06/10 09:42 AM
Joined: May 2004 Posts: 952 Stockholm, Sweden MrSixpack super stock
MrSixpack super stock Joined: May 2004 Posts: 952 Stockholm, Sweden	My 3 commando engines has cast pistons. 1970 Super Stock Challenger ex. Paul Rossi 1968 Dodge Dart GT 340 1968 Dodge Charger /6 3 speed manual 1966 Chrysler 300 Loaded 1968 Dodge Charger R/T 440 1968 Mini Cooper

Re: Are stock HP273 pistons forged or cast? [Re: Rhinodart] #466754 02/06/10 12:56 PM 02/06/10 12:56 PM
Joined: Dec 2003 Posts: 22,696 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,696 Bitopia	Quote: I have a couple 67 273 4-bbl engines apart and they are definitely forged and heavy! I also have a set of replacement forged pistons .030 over and they are real heavy! So when the time comes around to repbuild my 273, I don't care about the 318 bobweight issue, what lightweight piston options are out there, custom or off the shelf? Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: Are stock HP273 pistons forged or cast? [Re: Rhinodart] #466755 02/06/10 06:07 PM 02/06/10 06:07 PM
Joined: Jan 2003 Posts: 25,783 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,783 Rio Linda, CA	Quote: I have a couple 67 273 4-bbl engines apart and they are definitely forged and heavy! Got a pic of the underside? The INTERNET, the MISinformation superhighway

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