If I take a 302 motor and install: Bore .30 over 10:1 compression flat top pistons comp cam Stock rods Stock crankshaft Performance heads Aluminum intake Performance carburetor What kind of horsepower can I expect to see?
You would need to be specific about what heads, cam, intake, carb you're talking about. Headers and exhaust? Could be anywhere from 250 hp to over 400 hp.
302 bored .30 Hypereutectic pistons Edelbrock Performer RPM aluminum heads 2.02 intake, 1.60 exhaust Edelbrock Performer RPM intake dual plane 4 BBL Edelbrock Perfromer RPM camshaft Duration Advertised @ .050 Int Exh Int Exh 290° 300° 224° 234° Lift @ Cam @ Valve Int Exh Int Exh .310 .325 .496 .520 Timing @ .050 Intake Exhaust Open Close Open Close 5° BTDC 39° ABDC 54° BBDC 0° ATDC Centerlines Lobe Intake Seps. Ctrline 112° 107° Holley 4150 Carb 550 CFM (not sure of the jet size) Tri Y headers 2.5" Dual Exhaust to Flowmaster 40 No X or cross over pipe C4 Automatic with mild shift kit and Converter matched to cam specs.
That's very similar to my setup, see my signature, except that I have the larger RPM roller cam. You're gonna want something bigger than a 550 cfm carb. That's small for even a stock 302. You're increasing the breathing capacity of the motor, don't choke it with too small a carb. That split plenem dual plane intake will allow you to go a good bit larger because each cylinder only sees half of the carb. 600 at the very least, 650 is even better, stick cars often go with 750s. I duplicated the engine that Edelbrock has in their Performer RPM ads. They claim 385 hp or so. I'm little skeptical of that, maybe 350 hp. The slightly smaller cam you list would probably have you coming in a few ponies under that.
There aren't any Try-y headers that fit our cars that I am aware of. I put them on my car and the DS header got crushed by the steering. Pitman arm to be exact. With a C4 and dual plane, stick with a vacuum carb. Size is less important with the VS, and dual planes tame carbs and can usually run larger than you'd think. My neighbor runs a 770 SA Holley on his 302 with a Stealth intake and loves it. Heavy vehicle too, it'll scoot! If you want to save some dough, check Summit cams for that same spec. Their cams are made by the same company that makes Edelbrock cams. They are just in a different box. Often have exact same specs. I'd also guess 350 rwhp. With the C4 and 8" rear, you should see 280 rwhp as a general rule of thumb. You would pick up more on top too, if you were to use a mild single plane. I had a similar setup, but just heavily ported stock heads, 1.94/1.60 valves, and swapped between an RPM and Torker 289. The T289 slaughtered the RPM, hands down. Gotta remember a cam like you mention won't even make power until 2k rpms. So why run an intake that works best 1500 to 5500 rpm when you can run an intake that works 2000 to 6000? Waste of powerband.
Yeah. I've heard different performance engine builders discuss dyno tests they've done on the Edelbrock cams. They've found them to be somewhat lacking in power, designed mostly to sound good. I would suggest one of the Comp Cams Xtreme Energy cams. That's one of my winter projects, I have a XE266 roller cam to go in.
So boring really isn't a must, Only If I'm building a "Race Only Engine" it will help raise my compression levels?
if you don't have to bore it out don't. only reason to bore it out, unless you are racing it, is to make it round again. the less you go the more times the engine can be rebuilt.
Ohhh, So it all goes back to what the other guy said...Boring a motor is ok and great if your building a racing motor our if the cylinder walls are "out of round" or worn. And Boring a motor will help increase torque and horsepower because of the bigger pistons that will be used.
I desktop dyno'd mine (see specs below in signature) and got 363 tq @ 5500, 432 hp @ 6500. We all know how accurate Desktop dyno is, but if you knock of even 25%, I still have some decent looking numbers...275 tq and 325 HP. I could live with those numbers...especially since I have less than $500 in this motor This might give you a little estimate/comparison to base yours on.
Uh, yeah, take that 25% off. Unless those P heads are extensively ported and flowed by a professional you ain't gonna be anywhere near that first set of numbers.
