I Need Help With A Math Problem

[Casey Miles]

If I remember correctly, the 350/360 as rated at 390 or 400 HP back when we raced on street tires, around 1973. I remember that because nobody was racing them because of the HP rating. The '69 Z/28 302 is rated at 309 HP now and to race a '70 Z/28 which is rated at 320 HP, there is 110 LBS difference between the cars with the '70 having 48 cubic inches more with the same engine manifold, carb and heads. It's one of the biggest loss of power than any other engine combo.

Casey Miles
248H Stock

[Adger Smith]

Casey I didn't bother checking, but I'm pretty sure there was a difference in the intake lobes on the cam between '69 Z-302 and '70 Z-350. I think it was around .030 less on the 350.
Might be a little harder to feed those few extra Cu in.
Still soft...IMHO

[Casey Miles]

Originally Posted by Adger Smith

Casey I didn't bother checking, but I'm pretty sure there was a difference in the intake lobes on the cam between '69 Z-302 and '70 Z-350. I think it was around .030 less on the 350.
Might be a little harder to feed those few extra Cu in.
Still soft...IMHO

The now away cams, the .050 doesnt make a difference, if it was when we measured duration it might, but there's no substitute for cubic inches. If you use the same ratio of factory hp to the nhra rated, the 360 hp should be nhra 383 hp. The ratio is 1.06 on my advertised 290 hp to get to 309 nhra factored.

Casey Miles