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Original Message
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| RE: Cam questions? |
| By mark - 12/25/2000 1:34:43 PM; IP 208.18.102.200 |
| I would be cautious with the Rhoads lifters - they can slam the valves down fairly hard under partial duration conditions. Check out a post farther down in this site about a 428 buildup - uses Edelbrock heads and their Performer FE cam. Quite impressive numbers at streetable rpms. Probably as big as you'd want to go. 050 duration of 235 should be about right, or just a little less if any less. Lift you'd probably want to stay .550 max, range 525 to 550. Narrower LDA (OK with decent rod to stroke ratio and not a long stroke, which your motor is) down to 108 or 110 gives better midrange torque and a nice lumpy idle. That Edelbrock cam fits the bill pretty well. You've got a better rod to stroke ratio and a shorter stroke than the 428, so can go just a little narrower LDA to keep your rpms in streetable range with good mid rane torque. Other good ones are Lunati (check out their grind 06506, 07502 or 30505), they've done lots of work with FE engines, Erson (their grind 240221), Isky (grind 351271) or Comp Cams (268-AH10 or 270-AH10). Should do what you're looking for. They all list their specs on their websites. Oh, those Rhoads lifters also up your compression pressure at lower rpm (decreased duration, that's how they get better low end), so you'd have to watch your comp ratio to avoid detonation. If you want variable bleed lifters, check Crane - theirs don't slam the valves down like Rhoads. The newer cam profiles give you bettr low & mid range than older designs because of faster ramp acceleration rates (steeper ramps) so give the effect of variable duration lifters with the older style longer duration cams. |
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