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Alan Roehrich · 07-11-2011, 08:06 PM

The piston manufacturer must submit samples to NHRA for approval, and NHRA may require an unmodified OEM piston as a control sample, if they do not already have one.

I've been through the piston approval process, NHRA put us, JE and me, through the wringer, for 6-9 months.

07-11-2011, 08:06 PM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,118 Likes: 1,576 Liked 1,837 Times in 417 Posts	Re: Stock Piston Acceptance The piston manufacturer must submit samples to NHRA for approval, and NHRA may require an unmodified OEM piston as a control sample, if they do not already have one. I've been through the piston approval process, NHRA put us, JE and me, through the wringer, for 6-9 months. __________________ Alan Roehrich 212A G/S