1970 Pontiac Performance Brochure
I wish I could see those little illustrations better but obviously a 6x head and most other D ports are "fully machined wedge with a large squish area".
So where does a closed chamber fit into the mix? I read in the HO Racing manual that the open chamber was a design improvement over the closed chamber but all the new head designs are more like a closed chamber. Maybe thats where the grooves help?
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph
70 Lemans, 350/350, A/C, mostly stock
14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd
97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold***
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