It's because of the already "softened" chamber<<< I dislike that terminology--It's scalloped IMO. The HEMI has a factory scalloped chamber that widens the tuning window significantly under power adder applications--Basically the HEMI chamber is a slow burning chamber which is why when you add a second plug--things change so much. Hate to say it but a single plug wide open 170cc chamber is inefficient. J.Rob
Thank you for the explanation, that makes complete sense. Also makes sense now as to why they added the 2nd plug and quench areas to the G3 head.
