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Old 02-28-2005, 06:16 AM
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400 SBC...New CAM

I'm fixing to get a new cam for my 400 SBC, but I don't know what to get. So I'm going to ask the pros...


I have a 1967 Camaro.
Tranny - TH350 Newly rebuilt with a 2100-2300 Stall
12 Bolt - 3.73 Gears

The 400 sbc is basically stock, except it has an Edlebrock Performer Intake with a Holley 650.

I'm also wanting to know if I should get an Edlebrock Performer RPM instead of the plain Performer....everything I have read says the RPM will is 1500-6500 RPM, and the Performer is idle to 5500. So should I change to an RPM as well.

I'm also getting a Holley 750 Double Pumper.

Thank you for your time and expertise!
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Old 02-28-2005, 06:53 AM
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While many here including myself could give pointers on what cam to get, I`d say leave it to the guys on the tech lines, call comp or crane`s techies, and they`ll recommend a cam that will suit your application best. Remember, there going to ask the complete specs or your engine, vehicle, transmission and gears, so it`s a good thing you already know. Also whatever cam they recommend, you`ll need the proper valve springs, otherwise installing a high performance cam is useless. You can go to either of there web sites and get there toll free number.
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Old 02-28-2005, 07:10 AM
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Depends on what you want to do, but as a fun street machine i'd say Comp 280. If you do get the 750DP and RPM intake a 2800 stall and 292 Comp will really add to that package.
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Old 02-28-2005, 07:42 AM
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stock heads

The stock 76 cc heads are hurting you. You have no compression or flow. So going to a 2800 stall convertor is a waste of time and money. It will also make the tranny feel like it is slipping. Holley recommends a 650 carb on a stock 400. A 750 is going to lose power and make the motor feel unresponsive. Too small is always better than too big with carbs. Going to a performer/rpm intake would be great with a better flowing head and bigger valves. Another waste of money at this point.

So you are left with a stock 400, 5500 rpm, and no stall. The comp cams XE268H is the biggest cam you can handle without stall.
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Old 02-28-2005, 08:11 AM
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A 268 is a daily driver cam. Is this a daily driver?

I've seen more than one 400 with 462 dbl humps run good with nothing more than a 10" 3000 converter and 3.73s bumped by a 292. Castiron intake, HEI ignition and Q-jet. A 72 swb with this setup and 10" tires will smoke a stock 5.0.

What casting # on your heads? What pistons(flat or dish)?
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Old 02-28-2005, 08:52 AM
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I beleive that a XE274H would act in a 400 like a XE268H would in a 355. I had an XE268H in a 355 and really liked it. I had a 1900 stall, but could have used a little bit more. Based on my experience with the XE268H, I would recommend the XE274H for a 400. I think your stall is just right for it. I would also highly recommend the Performer RPM over the regualr performer, I dont think the performer will be able to keep up with a 400 much over 5000 RPM.

Adam
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Old 02-28-2005, 09:01 AM
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With stock heads it won't make power past 5000 anyway.

Go with the XE274 or something very similar. I like the new Lunati cams based on the specs. More lift and the same or less duration. Be sure to get the springs to match the camshaft, weak stock springs won't do with a modern lobe profile.

Larry
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Old 02-28-2005, 09:16 AM
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Quote:
Originally Posted by NXS
A 268 is a daily driver cam. Is this a daily driver?

I've seen more than one 400 with 462 dbl humps run good with nothing more than a 10" 3000 converter and 3.73s bumped by a 292. Castiron intake, HEI ignition and Q-jet. A 72 swb with this setup and 10" tires will smoke a stock 5.0.

What casting # on your heads? What pistons(flat or dish)?
I'll have to get the head numbers tonight.

I'm not sure of the pistons.
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Old 02-28-2005, 09:19 AM
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Quote:
Originally Posted by firestone
I beleive that a XE274H would act in a 400 like a XE268H would in a 355. I had an XE268H in a 355 and really liked it. I had a 1900 stall, but could have used a little bit more. Based on my experience with the XE268H, I would recommend the XE274H for a 400. I think your stall is just right for it. I would also highly recommend the Performer RPM over the regualr performer, I dont think the performer will be able to keep up with a 400 much over 5000 RPM.

Adam
What about the Performer RPM Air gap or the plain Performer RPM?
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Old 02-28-2005, 09:41 AM
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The four cams were ran with dish pistons and 462 heads & Q-jet carb and performer intake. The 270 cam had 1.6 rockers, RPM intake, 750 dbl pumper. The Air Gap.
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Old 02-28-2005, 09:50 AM
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Great information.

Thank you!
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Old 02-28-2005, 09:52 AM
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Here is my block number...if that helps anything.

3951511 - It is a 4 bolt main 400 sbc.
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Old 02-28-2005, 04:54 PM
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If you have the money for the air gap I would go with that, otherwise, the RPM would work fine. The Air gap will just make a few more hp due to a cooler intake temp.

Adam
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Old 02-28-2005, 05:06 PM
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NXS, could you run the XE274H with the performer RPMair gap, 1.6 rockers, and the 750, I would be interested in comparing those numbers to the 270 with those parts.

Thanks
Adam
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Old 02-28-2005, 05:09 PM
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On a 400 the RPM is definitely the way to go. The 650 will end up small with a bigger cam. The 750 wouldn't be too big in itself except for the downleg boosters. They will kill your bottom end until you get better heads. The 700 DP will work well with your combo. The only problem is that when you get better heads it will most likely be too small. The best thing to do would be to get the 9379 750 annular carb. They are on Ebay every once in a while.

Here is one
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33550&item=7955709 569&rd=1
I would rather rather have one with a choke shroud. You can modify them to work with chokes.

The annular boosters will keep all of your bottom end even with the stock heads.

When you do get new heads get ones with 64cc chambers. That will bump your compression up where you want it.
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