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BBM Pistons for B1 heads work with conventional heads? #1691185 10/27/14 11:37 AM 10/27/14 11:37 AM
Joined: Dec 2011 Posts: 131 Boston, MA J johnnyd OP member
johnnyd OP member J Joined: Dec 2011 Posts: 131 Boston, MA	Hi All, Generally speaking, I know that pistons designed to work with conventional BBM heads like (Indy 440-1) need some valve pocket machining to work with B1 original heads. Can anyone tell me about the opposite? Will pistons designed to run on a BBM B1 original headed BBM work with a 440-1 head or do they also need machining? I'm thinking of cam lifts less than .700 . Thanks!

Re: BBM Pistons for B1 heads work with conventional heads? [Re: johnnyd] #1691186 10/27/14 01:01 PM 10/27/14 01:01 PM
Joined: Feb 2008 Posts: 714 Central TEXAS!!!! sr4440 super stock
sr4440 super stock Joined: Feb 2008 Posts: 714 Central TEXAS!!!!	i would say no, unless you have a very low lift <.600 or the piston was way down in the hole. Joe Without Data, you’re just another guy with an opinion.

Re: BBM Pistons for B1 heads work with conventional heads? [Re: sr4440] #1691187 10/27/14 03:13 PM 10/27/14 03:13 PM
Joined: May 2005 Posts: 1,973 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,973 Apollo, PA.	Quote: i would say no, unless you have a very low lift <.600 or the piston was way down in the hole. Joe they are in two different locations. It can be cut though.

Re: BBM Pistons for B1 heads work with conventional heads? [Re: B1MAXX] #1691188 10/27/14 04:28 PM 10/27/14 04:28 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	B1 exhaust valve is a 1.76

Re: BBM Pistons for B1 heads work with conventional heads? [Re: johnnyd] #1691189 11/10/14 04:08 PM 11/10/14 04:08 PM
Joined: Dec 2011 Posts: 131 Boston, MA J johnnyd OP member
johnnyd OP member J Joined: Dec 2011 Posts: 131 Boston, MA	I emailed Indy and never heard back. I also emailed Koffel and heard back from them. They said that the B1 piston will work with a conventional head- just need to account for the compression ratio being lower from the increased valve reliefs in the B1 piston over a conventional headed piston relief.

Re: BBM Pistons for B1 heads work with conventional heads? [Re: johnnyd] #1691190 11/10/14 07:07 PM 11/10/14 07:07 PM
Joined: Jan 2003 Posts: 9,989 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,989 Frostbitefalls MN (Rocky&Bullw...	I have heard of this before. If the piston is B1 based, then there will be enough room for the rings and the valve reliefs, as the B1 is a tighter situation. If the piston is based on a standard wedge head, there might be problems. I wouldn't buy anything though without having an engine builder measuring it for the cam and heads you want to run. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: BBM Pistons for B1 heads work with conventional heads? [Re: johnnyd] #1691191 11/10/14 08:19 PM 11/10/14 08:19 PM
Joined: Feb 2007 Posts: 316 Utah dragnduster enthusiast
dragnduster enthusiast Joined: Feb 2007 Posts: 316 Utah	Quote: I emailed Indy and never heard back. I also emailed Koffel and heard back from them. They said that the B1 piston will work with a conventional head- just need to account for the compression ratio being lower from the increased valve reliefs in the B1 piston over a conventional headed piston relief. Thanks for the update, I am going to put my Victor heads on a B-1 based 512" lowdeck short block and I was hoping not to have to change pistons. I will definitely check p/v clearance to make sure though.

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