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  #1  
Old 03-14-2010, 01:52 PM
aallison aallison is offline
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Join Date: Jun 08, 2007
Location: NE Florida
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Do I have to replace cam bearings? And 401 build suggestions

I have a 401 with what I beleive to be a stock cam. The motor was rebuilt and has almost no time on it. Still has fresh cross hatch pattern in the cylinder walls. BUt it did sit outside and now I'm just cleaning it up and out real good. And increasing the power a bit while I'm at it.

I want a reliable daily driver that still gets decient MPG's as long as I stay off the throttle. I'm building to get a couple 100,000 miles out of the motor.

I'll be hauling the parts to my mechanic (he builds racecars in his spare time) for his opinion of the condition of the motor tomorrow.

I just pulled the cam out and the bearings appear to be new. The cam even appears to be new. No wear or score patterns. Same for the lifters. No wear or score marks. I see no scoring or wear. So if I want to replace the cam, do I really need to replace the cam bearings? THe FSM says I need to use a line bore with new bearings.

So can I just swap in a Cam?

I am looking for off idle torque.

THis is the plan.........
approx 9.5 pistons,
stock heads cleaned up a bit,
Edlebrock Performer intake,
Doug Thorley Try-Y headders
maybe a Howell EFI or a Truck Avenger carb.
I'll upgrade the oil system a bit and use a TFI ignigion with a CS144 alternator. Everything else basically stock.

I am looking for idle to 5000 RPM. The desktop dyno tell me I'll be at 444 torque @3500 and 335HP @4500 wtih a Comp cam XE256H.

So what suggestions do you guys have?
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  #2  
Old 03-14-2010, 02:27 PM
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The Colonel The Colonel is offline
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You can reuse cam bearings if they are in good shape, which it sounds like yours are. If they are scored or marked up I would replace them.
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Old 03-14-2010, 03:15 PM
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Sian09 Sian09 is offline
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When I'm rebuildin mine I plan on using the Comp cam 260. Others like it and the Summitt 8600. Either would be good and some like Eddy's. Lots of post about it. Do a search and you'll find all kinds of info! Good luck!
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Old 03-14-2010, 03:19 PM
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PlasticBoob PlasticBoob is offline
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Location: Long Beach, CA
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Quote:
Originally Posted by aallison
I am looking for idle to 5000 RPM. The desktop dyno tell me I'll be at 444 torque @3500 and 335HP @4500 wtih a Comp cam XE256H.

So what suggestions do you guys have?

That's what I'm running and it's a brilliant all-around cam with great low and middle end. It also plays very nicely with fuel injection. However, if you want to go "fast", it's a bit disappointing and I would look for something larger. There are many custom grinds on this site that are better; I'll probably be going with one on my next 401. Do a search and the numbers should pop up.

**Did they/you put new springs when you had it rebuilt? I forgot to add that you need to swap out your valve springs as well. You will also need new retainers and locks. Comp Cams will not honor the warranty if you don't replace your springs, and do you really want to be running old stock springs with a new high pressure cam? I think it's worth the peace of mind to safeguard against float and broken springs.
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Last edited by PlasticBoob : 03-14-2010 at 03:23 PM.
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  #5  
Old 03-14-2010, 09:00 PM
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jeepsr4ever jeepsr4ever is offline
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Quote:
decient MPG's as long as I stay off the throttle

Come awn now lets not get too crazy this is a 400+ cubic inch motor we are talking about here.
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Old 03-14-2010, 09:21 PM
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maccj5 maccj5 is offline
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cam bearings are one of the cheapest parts of a build why take a chance? they are less than 30 bucks --cheap insurance
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  #7  
Old 03-14-2010, 09:28 PM
aallison aallison is offline
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It was asked a couple times above about the rebuild.

I did not rebuild it. I know nothing of the rebuild. All I know is it was susposed to be rebuild and so far, nothing I've see does not make me belive that.
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Old 03-15-2010, 12:05 PM
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Josh D Josh D is offline
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Quote:
Originally Posted by maccj5
cam bearings are one of the cheapest parts of a build why take a chance? they are less than 30 bucks --cheap insurance

Usually the reason, if doing a ring and bearing job or just a cam swap, is because most people don't have a cam bearing tool and have to take it to a machine shop to have the cam bearings installed.
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Old 03-15-2010, 12:18 PM
Ristow Ristow is offline
 
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if they're intact-the babbit not peeling away-they'll be fine. the rear bearings are the ones to check the closest.
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