How Much Lift Can New Hemi Cast Iron Heads Take?

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How Much Lift Can New Hemi Cast Iron Heads Take? #1259005 06/28/12 08:55 PM 06/28/12 08:55 PM
Joined: Jan 2003 Posts: 4,288 Danville, NH M Mopar_Mike OP master
Mopar_Mike OP master M Joined: Jan 2003 Posts: 4,288 Danville, NH	Does anyone know what part number the springs are in the new Mopar assembled cast iron Hemi heads? I want to know how lift/duration cam I can run with them. Also are they set up to run unleaded gas? Thanks. Last edited by Mopar_Mike; 06/28/12 09:04 PM. RS23L7 4-Speed

Re: How Much Lift Can New Hemi Cast Iron Heads Take? [Re: Mopar_Mike] #1259006 06/28/12 11:05 PM 06/28/12 11:05 PM
Joined: Jul 2010 Posts: 417 reynoldsburg,ohio poppaj mopar
poppaj mopar Joined: Jul 2010 Posts: 417 reynoldsburg,ohio	On factory heads they usally put the double .620 lift max flat tappet springs. You need to worry more about piston to valve clearance. They have been putting hardened seats in the steel heads as well. I would pull a spring off to check and be sure. Good luck, poppaj AA/NSS 65'Coronet "Whompin Wedge" Pop & Son Performance 557" B-1 power John Holt Chassis

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