[blykins]

406ci

4.130" Bore
3.78" Stroke

Iron FE heads with 2.09" intake valves and 1.66" exhaust valves.

10.5:1 CR

750cfm Carb

Edelbrock Performer RPM dual plane intake


I've tried probably 15-20 cams this morning. I've tried Crane, Comp, Crower, and Isky.....solid flat tappets, hydraulic flat tappets, hydraulic rollers, and solid rollers. Actually I've tried everyone that I could find on the webpages. Yes I'm bored. I didn't change the other engine specs....just changed cams so I could find the cam for my wants/needs.

The most horsepower that I can get out of DD2k is 513hp with a mechanical roller cam. Actually I got a couple of 500+ hp cams from my research.

What's really floating my boat though is that I tried several solid flat tappet cams from each manufacturer. There were two that gave me approximately 490 hp. Crane has one that gave me 491hp ...but it's a very wide LSA....so it would probably idle like a Cadillac.

The next cam is a one from Isky. Now get this...

108 LSA, 240 degree duration, but only a .530" lift. Desktop Dyno is showing 491hp at 6500 revs...478 lb-ft at 4500 revs.

Does this make sense for such a low lift?

I'm trying to pick out a cam....and right now I'm doing all the bench racing and researching I can because none of the tech lines are open today. :-)

I really don't think I wanna go with a roller cam. The performance margin that I've found isn't worth the headache and extra $500.

One other thing I've noticed is that when I switch to a single plane intake, the hp goes up considerably. By using that same Isky cam and a single plane intake, the horsepower goes up from 491 to 545hp at the same rpm range. Does this make sense? Is it really that much of a gain? If so, it's definitely worth the price.

Comments are encouraged....I'd like to get all the info I can.