[Lukesportsman]

Has thoughts changed recently? I don't understand the "need" of twin plugging a mildly boosted low rpm engine. One of the biggest issues with any Hemi and especially a large bore hemi is flame front with humped high compression heads. It seems like a relatively modest $$ build if using CIS cams and stock rods. Why not spend the money on better pistons to keep/improve squish area and get ideal compression. Then throw in some 964 cams to make it responsive and zippy off boost on street. I like the 8-8.5:1 idea for street, but with proper electronics to monitor AFR save the coins on head work.

Im not saying it cant help, but if nothing else is pushing envelope, then I'm not sure the hassle and cost is going to improve it. There is a reason Porsche didn't do it on their 3.3 turbos. Its all in trade offs and a CIS pistoned/cammed 6k rpm engine.....I'm not sure.

Now you bump up the compression/cam/boost/rpm/timing/use on track.......twin plug starts to come into light.

Of everything debated, UNLESS heads need done, I would move twin plugging and necessary ignition upgrades down the list. Everyone may disagree and I'm running custom GT20's on mine so response was my target too.