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Purdy Swoft · 05-10-2014, 10:53 AM

I agree, Charley has done a lot for the performance side of the hobby, more than any other as far as variety of heads and other performance parts offered. Besides that, Charley is a regular guy and nice to talk with.

I don't have a Lion head at this time. I have read the model A forums for the past fourteen years. From what I have read, spark plug threads that protruded in to the combustion chambers and other sharp edges were the problems that needed to be addressed. Sharp edges and exposed threads heat quickly and can cause pre ignition.

I believe that all of Charlies heads have machined combustion chambers instead of cast as suggested in a previous post.

05-10-2014, 10:53 AM	#83
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Lion Speed Head I agree, Charley has done a lot for the performance side of the hobby, more than any other as far as variety of heads and other performance parts offered. Besides that, Charley is a regular guy and nice to talk with. I don't have a Lion head at this time. I have read the model A forums for the past fourteen years. From what I have read, spark plug threads that protruded in to the combustion chambers and other sharp edges were the problems that needed to be addressed. Sharp edges and exposed threads heat quickly and can cause pre ignition. I believe that all of Charlies heads have machined combustion chambers instead of cast as suggested in a previous post.