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Old 12-01-2010, 11:44 PM
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XR288HR spring selection in 454

Hi,
I've got a 454 and I'm gonna put an XR288HR in it. I'm pretty sure I'm gonna run 11/32" valvestems to cut a little down on weight. I'm not gonna spin it over 6000 RPM

Comp cams recomends a couple different sets of dual valve springs one has 347 lbs spring rate and is 1.509" od (size I happen to have now) 115/1.9 lbs. in. seat pressure and 322/1.20 lbs. in. open pressure. The other is 1.55" od has 354 lbs in. spring rate 153/1.9 lbs. in. seat pressure and open load of 383/1.250 lbs in. I'm thinking about getting the bigger one and having my heads machined to take em to be float free.

What about the beehive springs? If I was to use a set of those what should I look for? They seem to have low pressures though... Do I have to use shims or anything silly to make them work? Also they're tiny so how would that fit in my heads (haven't looked at em for awhile)? I like the fact that they have tiny retainers though so that'd help a little on its own with valve float..

Am I over thinking this??

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Old 12-01-2010, 11:49 PM
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I should add that I'm overly carefull and have been researching each part I install on this 454. Its been about a year now and I'm ready


Greg
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Old 12-01-2010, 11:55 PM
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I'd do the same thing you are planning, that first spring isn't enough to satisfy me even in a SBC.. You'll have to check of course, but I wouldn't be surprised if your spring seat will accept the 1.550" spring already, it is only .020" per side bigger than what is there and the 1.550" cutter is really common in a lot of shops, 1.509-1.510" not so much.

The BBC beehives will have like a 1.365-1.420" base diameter IIRC, you might have to put it in a OD spring cup or on a ID seat locater tp hold it if it won't center up on the guide base.
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Old 12-02-2010, 12:07 AM
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So It seems as though the secound one would be the way to go? Trouble is I've heard that comp cams went too conservetive with thier spring recomendations on their Extreme energy line. I'm thinking I'd rather be a little high than a little low...
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Old 12-02-2010, 12:27 AM
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The 115lbs seat pressure is what turns me off on the 1.509" spring, the 153lbs of thw 1.550" is much better IMO. Are you going to use a titanium retainer to shed weight too?? (I would)
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Old 12-02-2010, 07:57 AM
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What head castings are you using.?. Many BBC stock heads are hard pressed to get 1.800+ spring height. Many need +.100 valves and/or +.050 retainers. More than that and things can get expensive quickly..
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Old 12-02-2010, 08:15 AM
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In this instance, there's little or nothing to be gained by using any sort of beehive/ovate wire spring. It's not needed when a standard spring and retainer package will get the job done w/less hassle and cost.

The gain in flow from using the 11/32" stems is marginal. Unless the need was there for new valves and guides anyway, I wouldn't bother- not on an engine destined for <6000 RPM operation.

If you DO have to buy new valves, go w/+0.100" stems to provide the installed height needed for good springs. It's easier to use up some installed height w/shims than to be short of it when it's needed, IMO.
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Old 12-02-2010, 03:49 PM
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My heads need new guides anyways is why I'd switch to the smaller stem. also going with an undercut stem.. The heads are 820s.

I saw the titanium retainers but my concern was that they fatigue like aluminium. I thought they where cool but the posts that I've read people where afraid.


I saw that some of the valves where longer so I should get those?
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Old 12-02-2010, 04:47 PM
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I would stay with 3/8 stem valves +.100. I would also have the valve guides bronze lined as opposed to replaced. Unless you are installing 2.19 and 1.88 valves. The problem with BBC heads is. At manufacture the valve guides are pressed into the head. Then they are gang bored to fit seat and valve stem. This means the finished product works well, untill it becomes time for guide replacement. Aftermkt guide bores are centered. The factory guide is not. This means when the new guide is installed. The stock size seat is nowhere near correct. Many times this requires excessive cutting/grinding to get a seat. This can be a real pain. Especially if the head chambers are to be some semblence of close in flow, stem height and chamber cc. volume.

Titanium retainers are not like aluminum. They will last the life of a street motor.

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Old 12-02-2010, 04:52 PM
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I was just looking at my parts catolog and I think you're right. I like the milodon 3/8" .100 extended undercut SS valves. My machinest said something about wanting to put bronze lined guides in so that's good. I am going to install 2.19 and 1.88 valves, I figure any bigger (just 30 over 454) would hurt my bottom end. I've heard this guy in town does good work so I'm gonna try and get him to do a little porting too as well as a good valve job.

Guess I'm gonna have to research valve length.. What about the titanium retainers?
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Old 12-02-2010, 05:16 PM
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check my last post. Edited,, sorry dinner was burning....
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Old 12-02-2010, 07:25 PM
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thank you


What's the benifit of going with longer valve stems? I didn't quite understand.
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Old 12-02-2010, 09:03 PM
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You will need around 1.800-1.900 installed height for your springs. Stock passenger oval port BBC heads usually have room for a 1.750 spring max.

The only way to get the x-tra height is use a longer valve stem, use an off-set retainer, off-set locks and/or cut the spring pockets..

off-set retainers can cause rocker arm problems. Rockers can rub on outer edge of retainer.. NOT GOOD.. Off-set locks on a BBC don't leave much valve tip protrusion. Rocker can/will ride on the top edge of lock.. NOT GOOD.

Cutting pockets= expensive$$ can weaken spring pockets on some heads.

A taller spring will let you use a high lift cam without fear of coil bind. Generally the spring will be compressed less of its working height and will last longer/run cooler.

If you are buying valves anyway. The longer stems are the way to go.. Don't forget you will need different pushrods also. BBC's are particular about p-rod length. I keep about twenty different lengths in stock..

Last edited by BOBCRMAN@aol.com; 12-02-2010 at 09:12 PM.
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Old 12-02-2010, 09:09 PM
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Thank you,

That explaines everything now I feel pretty ready to make the purchase and I'm glad that I asked first.

Greg
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Old 12-02-2010, 09:15 PM
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had to edit again. getting old and had an emergency "head" run!!!
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