right now i m in the process of building A 383 stroker...... i m building it with all the edlebrock performer rpm stuff ....cam...air gap intake...heads......
750 four barrell edlebrock performer series carb....noww all of this is supposed to push around 410 hp 410 torque give or take 3 or 4 .....now once it travels thrua b&m tranny th350 what can i expect at the wheels with a gm 10 bolt rear?????

 

The RWHP number will be about 20-25% lower than the FWHP number.

I'm curious though... Why are you using that cam? Its a 40 year old GM design that never really worked very well, even when it was new. And why an Edelbrock carb? I bet an XE274 and a 650 or 750 Double Pumper would be a whole lot better... infact, I KNOW it would!

 

well i m using the edlebrock performer rpm and the xe247 what exactly is that cam

 

Never heard of an XE247, but an XE274 looks like this...

.490/.490 lift, 230*/236*@.050, 110 LSA.

Great street/strip cam with a relatively high compression motor and 2400 stall/manual trans. One of the best S/S cams out there IMO.

 

thanx man but the reasoon why i am going for the edlebrock cam is because i only need a 2000 stall and i want to try and keep it somewhat strteetable...and the only reason i m using the edlebrock carb would be to top off the rest of the edlebrock performer rpm stuff you know, complete the package


plus everything thats edlebrock is matched from 15 to 65 hundred rpms

 

The Edelbrock RPM cam SUCKS. It's a relic from the Stone Age. Might be the worst possible cam you could put in a new motor, with the possible exception of a 151 replica.

The XE274 will make about 10-15% more power that that old POS, get better gas mileage, and have better street manners.

That cam isn't "matched" to anything. It's been around since the late 60s. It's not an Edelbrock design or product at all, and has been around at least 20 years longer than the rest of the "package". If you want to get the IDENTICAL SAME CAM for alot less money, here it is..... "matched" to what? I don't know... crappy generic cam for less but alot smarter purchase, since it's IDENTICAL in every way, but costs about half as much.

Don't worry about the package; build a motor that runs good. Otherwise, you'll get to enjoy that wonderful feeling of watching people's taillights in front of you that have less money in their car than you, disappearing from view.

 

the xe274 is that a roller cam... i hope not... because i have an 84 flat tappet block

 

XE274

Incidentally, the heads and intake are the good parts of the RPM package (some people say that's the best intake there is, for a hot street motor, right now); the cam is HORRIBLE; and the carb is not too good either. A Holley will outrun it, for the same money.

 

yea, it's flat tappet like mentioned.

Also, your 383 will react differently to a cam then a 350. So if a cam says 2000-6000 RPM POWERBAND, your 383 will see 1600-5600RPM power band (for example). It'll lower it.

 

questyion ....will it lower it 400 rpm all the time

 

No...

Could be more, could be less. Could also depend on what you consider those numbers to represent. And of course, what else the motor is built out of.

As far as those numbers, are they the RPMs for 90% of peak torque, up to peak torque, then back down to 90%? 80%? 50%? Does it have ANYTHING AT ALL to do with peak torque or any other measure of output? Does it merely mean that the engine will run at those RPMs? They're just numbers they pluck out of the air, that sort of give you a general idea of what the mfr thinks they intended it for. Like, if you see one intake or cam or something from a mfr and it says "1000-5000" RPM, and you see another from the same mfr and it says "1500-6000", about all you can meaningfully do, is compare them and conclude that the second favors somewhat higher RPM operation. Doesn't mean you should use that RPM torque converter, or shift gears at that RPM, or any other hard "real-world" correspondence. On the other hand, if Edelbrock says theirs is "rated" for 1500-6000, and Holley says theirs is "rated" for "idle-7000", can you compare them? What do you think? (those numbers are really plucked from the catalogs BTW)

With a cam, what if you took that cam and put it in a 8½:1 350, and then took it and put it it a 11:1 383? Would the RPM range automatically "go down"? If so, how much? I don't know.... do you? What if the 350 had exhaust manifolds, and the 383 had headers? Iunno that either. Do the numbers tell you?

Those RPM numbers don't really mean a whole lot. I'd recommend diving into the matter a little more deeply and learning what each part actually does and what effect it has on the overall piucture and how they work together (or not), because that way you can make a more informed decision about what to build to get what YOU want. Which might not be the same thing that I want or Sonix wants, and what I want might you might hate.