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Old 06-25-2008, 03:32 AM
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Cam recommendations for my SBC

Was gonna go for a Comp XE274, but been warned about the extreme ramp rates on the lobes. Don't wanna use something that there's gonna be a high chance of wiping during break-in (or shortly afterwards).

I'll be using Edelbrock Performer RPM heads and a 600cfm carb (also have a 750cfm laying around). Static CR is 10:1.

Cam needs to be hydraulic flat tappet and needs to develop max. power by 6k RPM (6k is my rev limit on this engine).

Stick shift, car weighs ~2,500lbs, axle ratio is 3.54:1.

Car is not a daily driver... street-rod.

Want something that is gonna be a good upgrade compared to the Performer RPM cam I have currently. Don't mind a lopey idle.

Thanks,
Ian.
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Old 06-25-2008, 06:22 AM
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I posted this earlier but....

I have used several of these cams over the past few months with good results and no significant wear. One was even broken in with napa 10w30 and nothing else. It was an XE274H and it bent a valve which wiped out one lope. The others were in perfect shape.

Set it up right with the right springs, valvetrain geometry and don't overtighten them when adjusting and they it will be just fine.

All this hype about them failing sooner is from people who set them up wrong or didn't use the appropriate spring or overtightened them. Or something else. The product isn't inferior but the people who install might be!!

There are higher quality cams out there, but for a street rod that is driven on the weekends and not beat on, I think it is a good choice.
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Old 06-25-2008, 07:24 AM
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How about this cam? Can't find much info about it online, but it sounds good from the specs and description and the lobe ramps are quite gentle...

http://cgi.ebay.com/ebaymotors/ws/eB...262478082&rd=1
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Old 06-25-2008, 09:35 AM
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All this hype about them failing sooner is from people who set them up wrong or didn't use the appropriate spring or overtightened them. Or something else. The product isn't inferior but the people who install might be!!
This is something I believe happens more often than not. You slap stuff together you get a slap together deal. Builds that are thought out, accurately measured, checked and assembled with care don't seem to fall into this category. Just my experience. Pay the extra buck and a quarter and have your cam nitrided. There are plenty of low buck cams out there but just because it's cheap doesn't make it a good deal. Why 6000 RPM?
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Old 06-25-2008, 09:39 AM
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Quote:
Originally Posted by Stroke
This is something I believe happens more often than not. You slap stuff together you get a slap together deal. Builds that are thought out, accurately measured, checked and assembled with care don't seem to fall into this category. Just my experience. Pay the extra buck and a quarter and have your cam nitrided. There are plenty of low buck cams out there but just because it's cheap doesn't make it a good deal. Why 6000 RPM?
6000rpm is the limit for hydraulic lifters, no? I don't want to go solid or retro-roller.
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Old 06-25-2008, 11:00 AM
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Depends on the lifters, we use hydraulic flat tappets that compress at least .100 (per class rules) and we run them up to around 8,000 rpm with no misses or floating the valves.

The springs matter quite a bit though, and pushrods and the rest of the valvetrain.

This is using an Isky Mega Cam.
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Old 06-25-2008, 02:30 PM
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The XE274 should be a good cam for your application. Don't worry about wiping a lobe. It probably won't happen. It is a very popular camshaft for a reason. I've used it several times without a problem. Install and break-in as recommended and you'll be fine.

I recommend you phone comp cams. They will recommend the ideal cam for your setup. Buy whatever profile will suit your engine best and don't stress over the break-in.
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Old 06-25-2008, 05:03 PM
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I would think about using a crower or crane cam. I have a crower cam in my 63 chevy that I built in 1982. The car has over 150K miles on the motor and it runs like brand new and the car goes to the drag strip 8-10 times a year. Comp has had some issues with their cams, for me just enough to scare me. Some of their cores come from the far east with not great quality control. Check for other threads. As for the type of cam lift in duration you are interested in, is somewhat street-able and you would be very happy with that. To sum it up my experience with cams is spend more now and save latter. You will thank me
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Old 06-27-2008, 01:27 AM
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Quote:
Originally Posted by v8hed
How about this cam? Can't find much info about it online, but it sounds good from the specs and description and the lobe ramps are quite gentle...

http://cgi.ebay.com/ebaymotors/ws/eB...262478082&rd=1

That one looks to be real close to the RPM cam, but with a little more lobe separation so it might idle a bit smoother. A friend of mine had a slightly smaller Blue Racer cam in a 327 for a couple of years, and it worked well with no problems.
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Old 06-27-2008, 02:34 AM
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Quote:
Originally Posted by jimfulco
That one looks to be real close to the RPM cam, but with a little more lobe separation so it might idle a bit smoother. A friend of mine had a slightly smaller Blue Racer cam in a 327 for a couple of years, and it worked well with no problems.
Thanks. Think I've decided on the Comp XE274 now and I'll just make sure I cross every 't' and dot every 'i' during break-in.
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