GM did do a 400.. You went to your Pontiac, Olds or Buick dealer to buy a high performance 400.cv67 wrote: ↑Sun Nov 22, 2020 7:10 pm Always have a soft spot for them but as said earlier a real basic 400 evn wtih small valve iron heads is so much better.
Soon as I spent some time in a freshly restored crossram Z I lost the desire. not enough torque toe "peel the skin off a grape" as the saying goes. Better have a solid 4.56 gear or lower they are real cool...turds.
If GM woulda done a 400 up like that....beyond legendary
The 302 Z/28 should have come with the 327/350 HP
"151" cam if ordered with 3.73:1 axle.
It would have been better and faster in stock form in every way that matters. I know of Z/28 owners that did just this change back in the day.. The car was better in every way that matters.
On the 30-30 solid cam progressivily loosening the valve lash and advancing the cam improved performance on the street . 114LSA 110/118 advanced to 107/121 centers. As you loosen the lash the valvetrain gets noiser but the net at the valve duration and overlap get reduced to good effect for the street with milder 3.73 oem gearing on the Z/28. Even when headers are added
, indicating that a shorter duration street solid lifter cam would have been better on the street. where 4.56-4.88-5.13 gears are not desired by most.