Quote:
Originally Posted by TRADERMIKE 2012
Mike Thought:
I always wondered "How come they put Valve Reliefs on both sides of the Pistons". They are to lower the CR. I thought they would be only for 4 Valve per Cylinder DOHC Engines. I knew that the Wrist Pin on the Piston was off set for less pressure on one side of the Cylinder wall so you only need 2 valve reliefs. Always learning, thank you for sharing.
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Mike wants to know if {Originally Posted by b-man}
The info. you posted about the 428 ci Motor is coming back to me, as I too have read that in the past. Brings up the question of: "Did a 1967 390 HP version 428 ci 670 "D"-Port Head ever exist with "Smaller Valves" in a "Full" Body Pontiac Built on the Factory assembly line"? (Non, Bob-Cat Edition) As, I believe I've read about in the past. I am aware of 390 HP on 1968-69 428 ci because of the round port Head design upgrade, upgraded Cam and "Y"-Branch Exhaust.