CLASS RACER FORUM - View Single Post - Hemi piston pop-up

nolongerracing · 11-01-2019, 03:42 PM

Ok, This is what he is asking.... Can I adjust the piston out of bore (above deck) to compensate for a thicker head gasket.
Yes you can.
Your running clearance as per NHRA is .518. That is .536 above block - .018 gasket. 518 is the number you must meet.
If you use a .027 gasket, your piston may be above deck by .545.

Piston CC's do need to be correct. There are some that are not and are still being used. Will they ever check? Most likely not!!!

11-01-2019, 03:42 PM	#6
nolongerracing Member Join Date: Oct 2006 Posts: 164 Likes: 2 Liked 67 Times in 24 Posts	Re: Hemi piston pop-up Ok, This is what he is asking.... Can I adjust the piston out of bore (above deck) to compensate for a thicker head gasket. Yes you can. Your running clearance as per NHRA is .518. That is .536 above block - .018 gasket. 518 is the number you must meet. If you use a .027 gasket, your piston may be above deck by .545. Piston CC's do need to be correct. There are some that are not and are still being used. Will they ever check? Most likely not!!!