We built my cousin's 289, .030 over with AFR 165, Comp Cams 270H, shifts between 6500 and 6800. Little cam + big heads = fun. Ran a 7.96 in a 4 door 68 Fairlane, full car, just the front stabilizer, tools and spare removed. edit: 3000RPM stall, 3.80 and just enough exhaust pipe to make it faster, around 18 inches. For 300 rwhp with those heads you could run a Comp Cams 268H or 270H as long as the exhaust is good. You don't need a choppy cam with good heads. You could go with an Xtreme Energy cam and get more chop, but it probably won't actually be as fast. For a street engine you'll want 165s. The 185s flow roughly the same numbers as the 165, but you'll get more torque with the slightly smaller heads. If you're going for a strip motor, its a toss up. I think you'd probably still get better times with the smaller heads.
Just to give you an idea as to how heads make a difference, about ten years ago I had a stock roller 302 with ported E7 heads, topped with a Performer RPM and 650 Holley DP. Cam was a B303, with 1.7 rockers (Cobra rockers) It made power from idle to about 6000 rpms. I replaced the topend with the same Canfields I now have on my 331, which are the equivalents of AFR165's. I went with a Vic Jr intake, same carb, same cam, same rocker ratio (but different rockers) Powerband changed drastically, started coming on at 3000 and pulled all the way to 7500. The single plane Vic Jr. intake accounted for part of this. The heads for most of it (even with a B cam)
Not likely. The Boss 302 didn't even make those numbers. Stock heads are the "bottleneck" in these engines.
Yeah,I don`t know what it is about that b303 cam in a 302 but Ford really hit a homerun w/ it.I`ve seen many articles w/ people using it w/ the right combo and in some fox body stangs they`re getting 10 sec. ETs out of it.
I realize this is under ideal conditions but this is a good indication of how well AFR heads flow. http://www.carcraft.com/techarticles/116_0307_ford_302_v8_engine_buildup/
More folklore. That's a mild 224 duration roller cam with a .480" lift and a 6200RPM redline. It is in no way "10-second" material.
With the right components it will do it. It isn't the cam, it is the combo. Any part that isn't up to snuff will hold the rest of the engine back. Those heads flow like mad. Comp Cams 270H is suppose to be around 5500-5800 peak, in my cousin's 289 it pulls to around 6700.
Are you using the car for street or strip. I've always been under the impression you want to match the cam with the differential for a happy medium on the street. Strip? I don't know. My Bronco is cammed for low end torque, not great on the street...
Mostly street, but the driveability doesn't have to be fantastic. Though it is a daily driver, I don't drive it for much more than 50 miles at a time, that being on the high end of how far I drive it. Don't take it on the freeway or any of that, so I can gear it pretty low too.
There's a difference between rev to 7500 and "pull" to 7500. I seriously doubt your motor was making any power at 7500 with that cam. You can't fool mother nature, and that cam is mild & designed for a lower rpm peak. I know bench-racing is fun, but people love to throw out "10-second" this and "10-second" that, when the reality is that it takes a hell of a lot to run a 10-second quarter mile. Most 10-second cars are not even street legal. Maybe they were talking about a eighth-mile run. In any case, the B-303 ain't gonna do it in a 302. I don't care what components are used. In fact, roller cam components are too heavy to rev that high, and the valves would float at 7500 with most hydraulic cams.
