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I dunno but here is a feller in the other thread saying his 318 is "faster" that a 340...
Thats the next Comp Cam up from mine. You will need a 3000+ convertor to use it and it is happy turning some RPM's. 6000+. Look on comps site thay have dyno charts for each XE grind plus minimum requirements such as compression and convertor.
There must be a track near you. Weigh it, run it and plug the mph into the calculator. Get you close enough. Dyno’s can be stingy or very happy. Track is brutally honest. My car chassis dyno’ed at 343 RWHP and weighs 3445 with me in it. The calculators put me at 430 RWHP at 3445 lbs and 117 mph. I dyno’ed it for the shape of the curve and where. Not the number.
People get lost in dyno numbers and lose sight that it's just a tool, just like a timing light or a tire pressure gauge. If your engine doesn't the power it should for the sum of the parts do some investigating to find out why. It's easier on a dyno than in a car.
There is a strip about 40 miles away I could run at. When I use to own a Shelby Cobra replica years ago, I calculated my HP using the method you describe.
RPM power range is 2200-6000 on that cam
If the engine runs well and the car is driveable dont worry about the numbers you will drive yourself nuts. Drive it alot and be happy you can only do so much with 340 cid's. I would not attempt to put a larger cam in it to "wake it up" you are more likely to "screw it up" Been there done that, I will soon be in the process of removing the larger cam from my 340 which happens to be a Comp WR274HR-10
Very good suggestion. I don't race the car so it doesn't really make much sense for me to make any changes. The car runs fine the way it is. I was simply wanting to see how much HP I might have / be able to get out of the motor.
All I know is almost all folks I've met at car shows (and even here) with street cars that brag about a big hp number have cars that do not run the mph at the track that the dyno hp number would predict. At that point, the "HP" number is just a pathetic machismo thing. If you never plan to take it to the track, don't worry about how much hp it makes - just enjoy the hell out of it.