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Old 07-30-2007, 08:35 PM
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Anti-bump lifters

I have a 1986 Chevy 305. One of my friends own a racing series out at Oriely raceway park formaly known as Indianapolis raceway park gave me a crane cam with anti-bump lifters. He said that i could use the lifters on the street with no problem. My motor has aftermarket pistons in it. I dont know the size of the cam, but it is one they use in their race trucsk. My question is that I was told using the lifters on the street could cause engine problems, such as wearing out the valve guides. Has anyone else heard of this? If they shouldnt be used on the street, could i put hydraulic lifters on it instead of the anti-bump. ANY help would be appriciated. Thanks

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Old 07-30-2007, 08:47 PM
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he gave them to you?? they are worth just about what you paid. cant put used lifters on a new cam, cant put new lifters on a used cam, cant even swap lifters lobe to lobe. going to put a used racing cam of unknown specs in a 305 for the street is just dumb (sorry). throw them away and save yourself a lot of grief.
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Old 07-30-2007, 08:50 PM
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No matter how you look at it, it's not a good idea to re-use the parts. IF and I say IF you kept the lifters on the correct lobe when he pulled it out, I don't think a track cam would do too well in a 305 street engine.

Mark
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Old 07-30-2007, 08:51 PM
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Follow techron's and Jmark's advice. But just so you know what they are from now on.......

Copied from PopularHotRodding.com:

"You may have heard the term "anti-pump-up lifters." These are intended to fix a problem that can occur toward the top 25 percent of the engine's rpm range. What happens is that the spring starts to lose full control of the valvetrain and separation between various components takes place. This, as far as the lifter is concerned, looks like lash, so the lifter does it's job and takes it up. When the valve now tries to close, the lifter, which is now a little too long, holds the valve off its seat and heavy-duty power loss takes place. For many years, the accepted fix for this was an anti-pump-up lifter, which was a much leakier, faster-collapsing lifter that allowed the valve to physically close unimpeded. But it also collapses easier and consequently cuts valve lift. The real fix is a spring with better control."

As far as anti pump up lifters wearing out valve guides, I don't see how.
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Old 07-30-2007, 08:56 PM
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thanks, he gave me the cam and lifters for free. they have less than 30 laps on them, and he has them lobe for lobe.
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Old 07-30-2007, 09:01 PM
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The cam came out of a 305, and my motor was used in that racing series. Sorry, i forgot to put that.
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Old 07-30-2007, 09:16 PM
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if that cam came out of a race truck its ground for power way up high ( 7000-8000??) VERY, VERY bad for a street cam, put it in and you will have a SUPER PIG. you asked the question cause you dont know, lesten to the advice everyone is getting!! OH WAIT, i know what to do with the cam, give it to the guy your gonna race. when he puts it in you can blow his doors off.
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Old 07-30-2007, 09:25 PM
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Quote:
Originally Posted by V8S15
thanks, he gave me the cam and lifters for free. they have less than 30 laps on them, and he has them lobe for lobe.
In my opinion, lobe for lobe only works for the exact block they came out of. All blocks are machined a little differently due to tolerances at the factory and you have no guarantee that your block was machined EXACTLY the same as the block these lifters were run in.

Sell the cam on ebay and throw the lifters in the trash. You can usually run new lifters on a used cam in any block, but you can't run used lifters on a used cam in some other block. Well, you can, but you should order these from Summit when you do 'cause you're gonna need 'em.
http://store.summitracing.com/partde...5&autoview=sku
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Old 07-30-2007, 09:31 PM
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The guy with the truck ought to give you the cam specs. Also if the guy had them numbered to go with each lobe why would it be a problem? I guess I type to slow lol. Ive used used hydraulic cams with mismatched lifters in a drag car for the last two seasons its not a big investment engine but at the end of each season the cam or lifters have shown premature wear

Last edited by KGRIFF; 07-30-2007 at 09:37 PM.
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Old 07-30-2007, 10:02 PM
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Quote:
Originally Posted by techinspector1
In my opinion, lobe for lobe only works for the exact block they came out of. All blocks are machined a little differently due to tolerances at the factory and you have no guarantee that your block was machined EXACTLY the same as the block these lifters were run in.

Sell the cam on ebay and throw the lifters in the trash. You can usually run new lifters on a used cam in any block, but you can't run used lifters on a used cam in some other block. Well, you can, but you should order these from Summit when you do 'cause you're gonna need 'em.
http://store.summitracing.com/partde...5&autoview=sku
i second getting the parts from summit that techinspector recommends!! (that was funny tech)
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Old 07-31-2007, 01:27 PM
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ok, thanks for the imput. The cam is called a blue racer from Crane cams.
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