[Yamariv]

Originally Posted by SCOTI

Thanks.

Constantly reading everything I can on the subject & doing things the wrong way will teach you a thing or two.

Case in point... 2 1974 Z/28's. Both had 350sbc's; 4spd Muncies; full length headers/true 2.5" dual exhaust; & 8.5" 10-bolt rear ends.

Z/28 No.1
* Dished pistons swapped to flat-tops
* Old school 462/Fuelie/Cammel-Hump heads w/2.02INT valves; w/porting + milled for straightness & compression bump
* CompCams 230/280/.480" lift hydraulic flat tappet cam
* Victor Jr & 750 mech secondary Holley
* 27.4" rear tire & 4.11's

Z/28 No.2
* OE dished pistons
* 70's era 993 76cc iron heads w/2.02INT valves machined/added
* CompCams 244/292/.501" lift hydraulic flat tappet cam
* Victor Jr & 750 mech secondary Holley
* 26.5" rear tire & 3.08's

Z/28 #1 would snap your neck back & pin you to the seat accelerating.
Z/28 #2 was a dog off the line & generally had no power but sounded like it had more balls vs #1. It did not.....

The #2 car was mine. The motor was already built/car was set-up when I bought it. Car #1 was a buddys build. I was hoping mine would be as stout or more w/fresh tune-up stuff but you can't overcome that cylinder pressure difference & the heads ability to move air. Mine got totaled before I could re-work the motor. The drivetrain was plucked & certain parts were re-used. The rebuilt motor was the 1st of the several mentioned in my previous post. The much milder combo w/compression had 100% more seat of the pants power.

I appreciate all the info! Just to clarify, my engine has flat top pistons which should help with my specs