Join Date: Oct 2000
Location: Robbinsdale, MN
I'm looking for advise from anyone familiar with running a Comp Cams Magnum 286H in a small block.
I'm currently running their XE268H, based on the raves I'd heard about this cam, but have since heard that it's not recommended for higher compression ratios. I'm running about 10.3 to 10.4:1 with iron heads (Vortecs), tight quench, and all the sharp edges broken to reduce detonation, and, though I've not heard any detonation, or seen any indication on the plugs that it's a problem, my engine seems to nose over above 5500 rpm or so, and 1) I'd like it not too!, and 2) I'm concerned that I may be having some detonation that I'm not otherwise seeing that's contributing to the performance loss.
I'd like to have it run stronger up to, or even beyond 6000 rpm, and if I lose a little bottom end, that's not such a huge problem. The car has a vacuum cannister, so that shouldn't be a huge issue either. But, even though I want to maximize performance, it's still primarily a street car, and I don't want something that's absolutely MISERABLE around town. Comp's recommendation was the 286H (got this same advice from a couple different customer service techs), but I'd like some input from people that might be running it on the street in their own cars. I'd probably also run the Pro Magnum lifters with it.
355 SBC powered '87 Chrysler Conquest TSi - 10.3:1, Vortec heads, XE 268H cam, HEI, eq. length shorties, Performer RPM intake, 750 Edelbrock (1407), T-5 and 3.54:1 posi indep. rear