Camshafts: What effect does increased lift have on performance?

Kern Dog said
Absolutely.
It appears to have been approximately .010 below deck with 5 cc valve reliefs. .020 over, stock 3.58 stroke. I don't know the exact chamber size but online sources show between 63-72 ccs for a '308 head.

View attachment 1716356070

The first and worst case scenario comes in at 10.52 to 1, way too high for an iron head engine on 91 octane. If the pistons were .020 below deck, it gets slightly better:

View attachment 1716356071

If the heads are closer to 65 ccs AND if I used a piston with an 18 cc dish, the C/R gets around where I'd feel comfortable.

View attachment 1716356072

I don't want to always have to run 91 octane with this car:

View attachment 1716356077

Let's dispel that myth. 10.2 isn't too high for pump gas and iron heads. I run 10.6 on premium all the time when I drive Vixen. It's all in the tune. So yeah, you can do it just fine. And not with a large by huge cam, either.