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XE 268 cam for 454
I'm building a motor for my mud truck and I need at least 15 inches of vacuum at 800 rpm for tech in. The motor consist of 781 heads with the bigger valves, 9.5-1 compression. Bored .030 over. I'm either going to run a performer or a performer rpm intake. I was wondering if any of you guys have a build close to this with the xe268 cam in it. The main question is what amount of vacuum can you pull with this cam. This is a pretty big deal I don't want to put the motor in and then not pull enough vacuum. Then I have to bump up a class or put a different cam in it. I would appreciate it if one of you guys could check the vacuum on one of your hot rods and give me some feedback. Thanks
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You really need to talk with your favorite cam grinder. Call up one of the tech guys and ask your question.
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cam
I don't believe the cam will be too big for the 454. It also depends what gears you are running in the truck . Match the cam r.p.m.'s with the torque converter, if it's an automatic and the rear end ratio .The 268 should have plenty of vacuam at 800 R.p.m.'s . It really isn't that radical in a 454.:3dSMILE:
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A 350 pulls 15.5 inches at 800 rpm with a XE268 cam. The 454 will probably pull a little more, maybe 17-18 inches at the minimum.