Piston to head clearance

Bob F · Today, 09:31 AM

Steel rod bbc street engine may see 6500rpm if the owner gets too happy some days.
How close have you ran this without tapping the head?
I usually shoot for .040 but this could run a bit closer.
Thank you

Mike Pearson · Today, 01:01 PM

I run my race engine at .036. There would be no noticeable difference at .040. There is a lot of variables to this question. Bearing clearance, rod type, wrist pin stiffness, piston weight, piston to wall clearance. All have an effect on deck clearance.

Today, 09:31 AM	#1
Bob F Junior Member Join Date: Sep 2007 Location: Bucks Co Pa Posts: 75 Likes: 17 Liked 16 Times in 11 Posts	Piston to head clearance Steel rod bbc street engine may see 6500rpm if the owner gets too happy some days. How close have you ran this without tapping the head? I usually shoot for .040 but this could run a bit closer. Thank you

Today, 01:01 PM	#2
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,473 Likes: 632 Liked 1,985 Times in 598 Posts	Re: Piston to head clearance I run my race engine at .036. There would be no noticeable difference at .040. There is a lot of variables to this question. Bearing clearance, rod type, wrist pin stiffness, piston weight, piston to wall clearance. All have an effect on deck clearance. __________________ Mike Pearson 2485 SS