1.6 vs 1.5 rocker question

[rrcmotorsports]

Theories on camshafts can be very confusing but what people don't know is that their still to big on duration for the restriction of carb!! Even 248* is to big. It all depends on fuel system and head/intake. If using stock type head w/ 2 bbl carb I've found that going down to a 230-238* is best for restricted engine! The larger camshafts slow intake air speed WAY down thus feeling "boggy" off corner then feels like a 2 stroke powerband in the middle of the straights.

I'm an engine builder/cam grinder w/ an in-house dyno. I race a sportmod locally every week. Last year I had a 251-255 w/ .540 lift and ran good but off corners was just so doggy (Great traction control). I spent months R&D ing on making different profiles and dynoing them and I went down to a 238*-243* w/ .530 lift. And to tell you the truth, I'm running more RPM then last year and plenty of spunk out of the corners. I'm actually having problems w/ forward bite because of power on a dry track. For the hobby stock classes I'm down to a 230*-237* w/ .530 lift. If any of you know Devon Smith (National points champion) races locally here and I have a customer that can race door to door with him with that little cam! I think we're on to something

[stockcar5]

youre on the right track. i havent had a cam over 250 duration for at least 8 years. i've gone as low as 234/234 on my stockcar. my current favorite is a 244/242.

[perfconn]

Powerslide,your thinking is not flawed.

[TBRE]

Sounds about right to me, stay at or less than 250 @ .050 on 2bl stuff.
Another reason not mentioned for the gain from going back to 1.5 rockers, is the heads might choke at the higher lift the 1.6 's gave the engine.
It's all about the combination, plain and simple.TB