454 Rocker Ratio and Rocker Options - Team Camaro Tech
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post #1 of 12 (permalink) Old Oct 2nd, 05, 02:22 PM Thread Starter
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454 Rocker Ratio and Rocker Options

I bought a rebuilt 454 that I want to put into my 69 camaro. It doesnt have any rockers or push rods. I wanted to know what the STOCK ratio is. From what I can tell it's 1.7 but I wanted to make sure. I dont know what the cam is, but I was told it was bigger than stock but still pretty mild. I was wondering if anyone had used roller TIP rockers as opposed to full roller rockers, and if there's any big advantage to full rollers on a mild 454. I was trying to stay away from full rollers so that I could use the stock height valve covers cause it's an AC car and I plan to put in power brakes.

Thanks,
Adrian
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post #2 of 12 (permalink) Old Oct 2nd, 05, 07:09 PM
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Bob
 
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Re: 454 Rocker Ratio and Rocker Options

I wouldn't bother with Roller Tip rockers if you aren't going to go with the complete roller cam setup with full roller rockers. I don't think roller tips are any real advantage.
Get a set of good long slot 1.7 regular rockers and you should be all set. Just make sure that you get the correct length push rods for the valve lift of your cam. Do you know if it is a hyd or solid cam?

Bob
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post #3 of 12 (permalink) Old Oct 2nd, 05, 09:32 PM
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Steve
 
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Re: 454 Rocker Ratio and Rocker Options

I tend to disagree. I think a roller tip is definitely an advantage and reduces valve side-loading/guide wear considerably and frees up some friction at the tip too.
A fully rollerized rocker is way preferable if it fits under your valve covers, even with a low lift cam.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #4 of 12 (permalink) Old Oct 3rd, 05, 09:11 AM
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Re: 454 Rocker Ratio and Rocker Options

Agree with Black-out,..a set of Comp Cams roller tips are about $150,..not much more than a set of new GM standard rockers. You'll enjoy two advantages,..less friction and heat, and true ratios,..which should mean a few more ponies.

So, why not?
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post #5 of 12 (permalink) Old Oct 3rd, 05, 04:28 PM
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Bob
 
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Re: 454 Rocker Ratio and Rocker Options

Standard rockers offer less small parts to end up in your engine with a rocker arm failure and I stick by the fact that they provide very little gain on any performance front.

Bob
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post #6 of 12 (permalink) Old Oct 7th, 05, 09:10 AM Thread Starter
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Re: 454 Rocker Ratio and Rocker Options

Sorry I've been away, thanks for you replies, I have one question though... I went out to check out the lifters...

I'm not too familiar with SOLID LIFTERS, all my engines have had hydraulic or roller lifters... when we talk about solid lifter is it litteraly one soild chunk of metal?

The block is a 71 block, and the lifter I pulled up was solid where it touches the cam, it had one groove around the body with a hole and the push rod seat also had a hole. I'm assuming this is some sort of hydraulic lifter.

Lets assume I get a set of full roller rockers, I shoudl be able to use the stock size push rods, since I'm prety sure there cam isnt anything crazy, right?

Thanks,
-A
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post #7 of 12 (permalink) Old Oct 7th, 05, 09:20 AM
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Bill
 
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Re: 454 Rocker Ratio and Rocker Options

It is my understanding that while the stock BBC rocker arm ratio is 1.7, there is a standard deviation of about 0.1.

Crane Energizers are a nice budget roller rocker IMO.
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post #8 of 12 (permalink) Old Oct 7th, 05, 09:28 AM Thread Starter
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Re: 454 Rocker Ratio and Rocker Options

Are there any roller rockers that will fit under stock short valve covers or am I goign to have to go tall? I have A/C andwill be upgrading to power brakes, so I was hoping to avoid the tall covers... though perhaps I just cant.
-A
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post #9 of 12 (permalink) Old Oct 7th, 05, 09:44 AM
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Bill
 
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Re: 454 Rocker Ratio and Rocker Options

I have heard that you can stack valve cover gaskets if you just need a little clearance, but I have never tried that myself.


As far as "tall" vs "short", I have found that it's not that cut and dried. Some valve covers are very short, others are mid-height and are called "short". Others are mid-height and are called "tall" while others are wicked tall for stud girdles and are still called "tall".

On my brother's Chevelle he had a set of "tall" fabricated Moroso covers which couldn't be removed unless we took the brake booster off. I bought a set of regular "tall" Moroso stamped steel ones for him which have plenty of room.

Sorry if that's clear as mud...
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post #10 of 12 (permalink) Old Oct 7th, 05, 10:12 AM Thread Starter
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Re: 454 Rocker Ratio and Rocker Options

Ahhh... "wicked tall"... reminds me of being back in boston...

How do you know if these lifters are concidered SOLID or HYDRAULIC?
-as
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post #11 of 12 (permalink) Old Oct 7th, 05, 01:49 PM
 
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Smile Re: 454 Rocker Ratio and Rocker Options

A solid lifter will open the valve after you get it tight and are still tightening the nut whereas a hydraulic lifter will start to calapse after you tighten it so the pushrod can't spin in your finger and thumb instead of opening the valve.

Then once you get it bottomed out, it will open the valve b/c it is solid then like a solid lifter. BUT it won't have any hydraulic cushion so won't be a good deal...

pdq67



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post #12 of 12 (permalink) Old Oct 10th, 05, 06:34 AM
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Steve
 
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Re: 454 Rocker Ratio and Rocker Options

Comp Cams Pro Magnum stainless steel rockers may fit under the standard rocker covers. Crower make a similar rocker also. I have a set of the CC on my engine and they are more compact that aluminum rockers.
Because my cam is a moderate solid lifter, I can't say if the rockers would clear low valve covers.
Comp may be able to tell you. They really don't appear that much larger in area over a stamped rocker.

These rockers will work with standard length pushrods..

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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