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Myron Piatek · 11-29-2010, 12:53 PM

It seems a lot of people use Crane, Isky or Mopar ductile iron rocker arms which are allowed in part because of their similarity to OEM 273 and 340-6 rocker arms. A place caller Rocker Arm Specialists can blueprint them for you. They can also modify the OEM 273 rockers to use the jam nut instead of the OEM adjusters.

IHRA allows rollers in Stock. Who knows if NHRA will eventually with the way things have been going.

11-29-2010, 12:53 PM	#2
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: Chrysler Small Block It seems a lot of people use Crane, Isky or Mopar ductile iron rocker arms which are allowed in part because of their similarity to OEM 273 and 340-6 rocker arms. A place caller Rocker Arm Specialists can blueprint them for you. They can also modify the OEM 273 rockers to use the jam nut instead of the OEM adjusters. IHRA allows rollers in Stock. Who knows if NHRA will eventually with the way things have been going.