valve cover clearance 427 BB - Team Camaro Tech
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post #1 of 14 (permalink) Old May 18th, 19, 04:57 PM Thread Starter
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Unhappy valve cover clearance 427 BB

So I get the motor back from the machine shop. He used Scorpion roller rockers. I didn't have an issue with that until now. Valve covers won't fit. Any valve cover. You can see the problem in the pics. Just one rocker on each head interferes with any valve cover. So my question is, would it hurt to clearance the 2 rockers at the corner edge? You can see by the pic where I'm talking about. Any thoughts? I REALLY don't want to have to buy another set of rockers. She still doesn't understand why I'm changing motors to begin with. LOL
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67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
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59 ElCamino

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post #2 of 14 (permalink) Old May 18th, 19, 05:12 PM
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Re: valve cover clearance 427 BB

Because of the Proform 1.6 roller rockers I had used on mine. I had to go with tall valve covers which were a pain when it came time to pull the drivers side. I just swapped out my old 462 heads for a set of jegs 514022 aluminum heads. Checked the clearance and with still using the 1.6 RR I was able to purchase these https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1. and the fit is excellent with enough clearance under the windshield wiper motor that I don't have to finagle them to get the drivers out.

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post #3 of 14 (permalink) Old May 18th, 19, 05:39 PM Thread Starter
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Re: valve cover clearance 427 BB

Looks nice. My issue is bolting any valve cover on the head. I have 5 different sets and styles at the shop. Height clearance is not the issue. That one rocker is hitting the side of all of the valve covers. Right where the indentation has to be. It's not hitting by much. I was thinking of grinding off the corner of the rocker a smidge. Wondering if anyone has done this before. And if it was OK afterwards.
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67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #4 of 14 (permalink) Old May 18th, 19, 07:36 PM
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Re: valve cover clearance 427 BB

I took some material off the corner of one or two of my gold race rockers on my 454. I have tall covers too. I have had no problems.
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post #5 of 14 (permalink) Old May 18th, 19, 08:02 PM
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Re: valve cover clearance 427 BB

I think I would worry more about hitting the ridge on the head than on the valve cover. I don't believe that rounding out that corner will weaken the rocker body at all. If I may ask, why did they go with 1.7s. Seems a bit extreme, but I did go with 1.6s?

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post #6 of 14 (permalink) Old May 18th, 19, 08:19 PM
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Re: valve cover clearance 427 BB

1.7 ratio is standard on a big block.
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post #7 of 14 (permalink) Old May 18th, 19, 08:28 PM Thread Starter
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Re: valve cover clearance 427 BB

Quote:
Originally Posted by Nantooch View Post
I think I would worry more about hitting the ridge on the head than on the valve cover. I don't believe that rounding out that corner will weaken the rocker body at all. If I may ask, why did they go with 1.7s. Seems a bit extreme, but I did go with 1.6s?
The decision to go with 1.7s was my engine builders. I left those decisions to him because being old, and working 12-13 hr. days, I try to preserve whats left of my brain. Which isn't much. LOL Remember, I'm talking about a big block 427.

Quote:
Originally Posted by akwolf View Post
I took some material off the corner of one or two of my gold race rockers on my 454. I have tall covers too. I have had no problems.
Was that to clear the same issue I have? The rockers have so much meat on them, I'm thinking that taking a little bit off the corner shouldn't be an issue. I think a 16th off the corner. Given the fact that the machine shop bought them, I doubt I could exchange them for another style. And that would be guaranteed if I grind them. LOL

Anybody else have clearance issues with these? Scorpion 1.7s.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #8 of 14 (permalink) Old May 19th, 19, 06:14 AM
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Re: valve cover clearance 427 BB

My thought is Your builder didn't see that? I assume it has not been run?

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post #9 of 14 (permalink) Old May 19th, 19, 06:30 AM Thread Starter
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Re: valve cover clearance 427 BB

No, the motor hasn't been run yet. And yeah, I'm surprised he didn't see that also. Seems like everytime I trust someone to make a decision that I should be making, it bites me in the ***.
So I'm having the torque converter built in redding cal. locally. A 28-3000 stall. They can do it for $450. VS $550+ for others. He's trying to convince me that a 10" converter will perform better that a normal size converter of the same stall speed. Wouldn't the 10" produce more heat? It's a street car, I'm not racing it. Another decision I'm worried about leaving to someone else.
Your thoughts?

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #10 of 14 (permalink) Old May 19th, 19, 06:56 AM Thread Starter
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Re: valve cover clearance 427 BB

OK. Breaking news. LOL After going to Scorpion rockers homepage and looking up the part no. It seems they have specially machined 2 rockers for #1 and #8 to clear the valve cover on 396-502 mark IV's. So I'm going to look for those 2 rockers that are probably stuffed on some other valve in the head. Whew, this may be the fix right in front of me. LOL I'm feeling a little better, not much, but a little. LOL
And I will be calling the engine builder about at least GLANCING at instructions of after market performance parts applications. Dammit! LOL

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #11 of 14 (permalink) Old May 19th, 19, 07:17 AM
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Re: valve cover clearance 427 BB

For the converter, smaller is usually better.

Smaller converters typically stall higher due to their reduced circumference, whereas a larger converter often has a reduced fin angle which contributes to additional slippage & reduced lockup at higher speeds.

Plus a lighter, small converter can also help with performance.

Keep in mind 2 converters for 2 different manufacturers can be totally different.
The physical design & quality of the part can make a world of difference.
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post #12 of 14 (permalink) Old May 19th, 19, 08:25 AM
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Re: valve cover clearance 427 BB

OP

Ideally you can find/swap the 2 RR that, according to your note from Scorpion, are cast smaller to clear BB applications and relash the valves.

Aluminum bodied RR are bulky compared to steel (Comp Ultra Pro Mags). IMHO Scorpion are more a budget RR. I know several Cobra guys who have 427 SB motors had them break.

Hope your builder checked PR length....might want to take a Sharpie and mark one of the valve tips, install/lash RR and rotate engine twice by hand, remove that RR, check witness mark on valve tip since you will be swapping a few RR anyway. It wants to be centered on the valve tip. Pattern closer to intake side wants a longer PR. Pattern closer to exhaust manifold wants to be shorter. They make adjustable PR check tools for about $10

2800-3000 stall converter...regardless of size you will need a external tranny cooler. Good idea to run a tranny temp gauge with high stall converters. IDK how big a cam you have but 2400 stall may be more street friendly
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post #13 of 14 (permalink) Old May 19th, 19, 02:09 PM
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Re: valve cover clearance 427 BB

No issue at all grinding of the 2 corners, I did it on a set of Harland park rockers and never had a problem

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post #14 of 14 (permalink) Old May 19th, 19, 05:19 PM Thread Starter
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Re: valve cover clearance 427 BB

Well, here's the solution. Putting the right rocker on the right valve. LOL The "pre-machined" rockers belong on the #1 & #8 intake valves. I found them on the #5 and #7. It's going to be enough clearance for the valve cover to bolt on now. Thank god.
Yes, the push rod length was checked and they are shorter than stock.
Yes, I am running an external trans cooler.
Glad to hear that aluminum rockers can be ground on if needed without destroying a set.
I'm going to go with the 10" 2800-3000 stall converter, it was highly recommended by the cam grinder. I had it custom ground by Bullit cams for the tunnel ram and power brakes. LOL
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67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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