[Model A Ron]

Originally Posted by GeneBob

I just replaced a Snyder 6:1 with a Lion III. The Snyder head is a good solid performer but the Lion III seems to provide a wider, flatter torque curve (by the seat of the pants measure). To be fair, I also changed to the FSI ignition at the time because of the spark plug locations. I honestly think the Lion III improved performance with better flow.
The Lion III is made to be about 6.5± compression but is thicker than the stock head designs so it can be machined down if higher compression is desired.
Also, I have a Stipe cam, a Weber carb and the cast iron header from Snyder's on a fresh rebuild. This is a pretty balanced combination although it wants a lot of timing advance at lower RPM. I made a plate to limit total spark advance to about 31° at the crank but it wants at least 10° off idle or it will hesitate.
Just some more information to further confuse...

Did you have to do any further modification to the Lion Head III? What is your opinion on putting one on a stock Engine? From what I understand they need additional machining to avoid pinging......is this true from your experience?

Thanks
Ron