I run a slightly milder cam in my 367; an old Hughes 230/237/110, .549/.571 lift with 1.6 roller-tipped only aluminum rockers. But I think those old Hughes cams were spec'd at .008 lift.I also use their Anti-pump-ups at 1/2 turn preload and their springs, on the Eddies.
I really like this cam, but I did have to swap in the 3.09 low-gear ratio set to be able to continue using my 3.55s. The 2.66 low was just not doing it for me. Now it's a dump-it-and-go deal. The 3.09 is plus 16% more starter gear, just what she needed. With a 2.66, you would need 4.10s to compare.
But of course 4.10s would put you at 70~3700 with 26" tires.
Whereas with 3.55s it would be ~3200, except with a GVOD,~2500.
That Hughes cam has cruised thousands and thousands, and thousands, of miles, at 2100, allbeit with a ton of advance, and has always burned 87E10, with over 175psi cylinder pressure (10.9Scr); yay alloys! And no I don't stomp on it in overdrive,lol.
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AJ's ramblings,
In a 340,with alloys, I think it will like even more than 10.9Scr.
I sure would NOT run it on the street,at 9/1, with 3.23s. Well, I wouldn't run it at all with 9.1,lol. Even with a clutch...... cuz the vast majority of time, you will NOT be just taking off, NOR racing, NOR doing anything, but cruising.And your primaries will be nearly closed, and your effective compression ratio (not SCR, and Not Dcr) will be waaaay down, perhaps at 5/1 or even less. And 9/1Scr will be just wasting vast amounts of fuel..... because that 704 is not a cruiser type cam,lol.
But why does it waste fuel? Cuz at 5/1 and near-closed throttle, the fuel cannot find enough oxygen to react with..... until you fatten it up, and then a bunch of it goes right out the tailpipe having never contributed it's potential energy, and that would be with proper ignition timing.
With 3.23s you will be doing 70~2920rpm, with the primaries barely open. The engine will want about 50 to 60 degrees of advance, for you to lean it out, giving the fuel extra time to find oxygen, and still provide the push at the right time. Where are you gonna find that advance? More Scr will reduce your timing requirement.
So then in an effort to get some semblance of fuel economy, the more compression that you can run, the better. Plus it just makes the engine wake up so nicely.
Normally we don't care about economy with big cams. But if over half your miles are gonna be hiway, and I know your gas ain't cheap down-under, so it might be important to you. I know it was to me, and every part I put into my engine reflected that....... until I got a little better off financially, and slammed the big-cam into her. But by that time I already had the overdrive.
Your requirements might be different lol.
