New cam/intake power....any guesses?

[Rev]

I'm going to go from an Edelbrock Performer intake (carbureted) to an Air Gap intake. Also going from a flat tappet CC 268/268 HE to a CC Extreme Energy flat tappet 268/280 cam. The .050" durations are 218/218 versus 224/232. Lifts are 485/485 lifts versus .509/.512 lifts. I will need to revert to 1.6 rockers from my present 1.7's.

I'm hoping for 15-20 RWHP from these changes. Full details of my current setup are at the user rides link at the bottom of my sig.

Any guesses as to power improvement from these changes? Last DynoJet numbers were 280@5700 / 293@4000 (uncorrected).

Rev

[Dark_5.0]

What cylinder heads are you running? If you have some good heads the extra lift and duration should do some good.

Are you running a proform main body yet on your carb? Now thats a good mod my dads 383 stroker seen big gains at the track.

[Rev]

I'm running pocket ported / gasket matched TFTW heads. The 625 Road Demon does have an electric choke that I need to keep as this is a street driver.

Rev

[~The Jester~]

That cam and intake will get you some ponies for sure, especially with TF heads on it.

I'd be curious to see what a bit more carb would do for ya too. Anyone have a 650/700 you can throw on there to try?

I'm gonna go play with your combo on my desktop dyno, be back in a bit...................

[~The Jester~]

OK, here's the skinny. With what your running now, I'm showing 361HP @ 6000. Cam is CLOSE to what you have, don't have the exact cam file for that one. With your new cam, I come up with 373HP @ 6000. Hang a 700 CFM carb on there, and we get you up to 378HP. This is of course flywheel HP we're talking, and on a computer to boot. I can't put in the exact intake either, so I used "dual plane 4bbl" for both scenarios. We all know that that differs greatly from "real world" horsepower.

You're probably gonna see your expected 20HP increase! Also, when you go to get rid of those 1.7 rockers, gimme a shout!

[Rev]

I got the EXE 268H cam and the RPM Air Gap carb intake from Summit yesterday. I have to change back to 1.6 rockers from the 1.7 TrickFlow RR's that I was using. They are on back order for another week more or less. I'm going to to go ahead and start tearing it down as I like to take my time and degree in the cam as well as check piston/valve clearance etc. I can't really finish all that until I receive the 1.6 RR's though.

Jester, I'm thinking about the same as you suggest. Hoping for 15-20 more peak hp without low end loss of torque. I do have the simulated dyno programs (Desk Top, Engine Analyzer, DynoSim). The problem with some of these is that they assume that all increases in carb flow numbers always result in more hp. In other words, the program assumes that the engine can use the extra flow. Just try putting in excessive flow for some low performance engine and you will still be rewarded with more power (at least in my experiments). At any rate, I don't think my 625 CFM is hurting me any.

I do appreciate your input on this. I guess only the time slips and DynoJet will really tell me much. Actually, my G-Tech Pro hp/torque measurement feature works pretty well and is fairly consistent once you get used to the lower numbers.

After I get the cam/intake installed, and get time slips and new DynoJet numbers I'll post them.

Rev