Long vs extra long slot BBC stamped rockers - Chevelle Tech
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post #1 of 27 (permalink) Old Jan 25th, 19, 1:32 AM Thread Starter
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Looking for input on 1.7 ratio stamped rocker that will handle .600+ lift. Found one post where Vintage Musclecar was running Crane nitro-carb steel long slot with ~.618 lift. Most info I find generally states long slots are only good for sub-.600 lift applications. So then I see the crane "extra long slot" steel & ductile iron stamped rockers (less durable but much better than OEM and much cheaper than nitro-carb steel) but no data on max lift. Who else is running stamped rockers with over .600 lift at the valve?

Crane # 13801, steel & ductile iron, extra long slot, max spring OD 1.56"
Crane # 13801C, nitro-carb steel, long slot, max spring OD?

Cam I plan to run is spec'd at .600/.570 lift at the valve.
Springs are 1.55" OD with a 1.56" OD retainer.

if I missed any important info, let me know.

Thanks,
Kevin

-Kevin
1965 Chevy Biscayne
<removed> 454cid, "peanut ports", Voodoo 60201
<coming soon> 460cid, Brodix RRO 270, 229/241 Hydraulic Roller
TH400, 3.36 Stock Rearend

Last edited by 65cayne; Jan 25th, 19 at 1:58 AM. Reason: Add additional info)
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post #2 of 27 (permalink) Old Jan 25th, 19, 2:36 AM
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Re: Long vs extra long slot BBC stamped rockers

How much spring pressure? Stamped steel rockers dont like high pressures. Your signatur says hydraulic roller coming soon.

Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
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post #3 of 27 (permalink) Old Jan 25th, 19, 4:19 AM
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Re: Long vs extra long slot BBC stamped rockers

with the good quality roller rockers available now at reasonable prices there is zero reason to run stamped steel rockers unless you are building a stock engine or they are mandated by a racing sanctioning body
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post #4 of 27 (permalink) Old Jan 25th, 19, 5:37 AM
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Re: Long vs extra long slot BBC stamped rockers

Those nitro-carb rockers are good. I've seen and worked on engines with those at 600 lift and 140++ seat pressure. kept track of lash, and rotated the intake to the exhaust. from time to time. It's pretty much always the exhaust that die. You can see them turning dark in the socket area.

of course, nobody is spending millions advertising them, so they don't show up with all the latest, greatest, supertrick stuff in the magazines. Doesn't mean they're not good, but may not be the most profitable for the makers.

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post #5 of 27 (permalink) Old Jan 25th, 19, 5:53 AM
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Re: Long vs extra long slot BBC stamped rockers

https://www.summitracing.com/parts/crn-13801c-16

I don't know how hard these things are supposed to be, but I do know a good file bounces off like a basketball on a concrete floor.

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post #6 of 27 (permalink) Old Jan 25th, 19, 8:27 AM
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Re: Long vs extra long slot BBC stamped rockers

I would find out from Crane what spring pressures they like to see on these. The nose pressure capacity will be very important. Also think ahead if you do decide to go hydraulic roller - no need in revisitng this twice.
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post #7 of 27 (permalink) Old Jan 25th, 19, 8:53 AM
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Re: Long vs extra long slot BBC stamped rockers

Quote:
Originally Posted by Lew540 View Post
I would find out from Crane what spring pressures they like to see on these. The nose pressure capacity will be very important. Also think ahead if you do decide to go hydraulic roller - no need in revisitng this twice.
Yes open pressure is what op needs to watch out for. Stamped steel longslots work good to around 350lbs open maybe little more.

Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4 wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
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post #8 of 27 (permalink) Old Jan 25th, 19, 9:43 AM
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Re: Long vs extra long slot BBC stamped rockers

Any Value in using Crane Kool Nuts in a stamped-rocker application like this? Do they work as claimed?
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post #9 of 27 (permalink) Old Jan 25th, 19, 10:21 AM Thread Starter
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Re: Long vs extra long slot BBC stamped rockers

Quote:
Originally Posted by Malibu ss 64 View Post
How much spring pressure? Stamped steel rockers dont like high pressures. Your signatur says hydraulic roller coming soon.
Quote:
Originally Posted by Malibu ss 64 View Post
Yes open pressure is what op needs to watch out for. Stamped steel longslots work good to around 350lbs open maybe little more.
Yes, .600/.570 229/241 HR coming soon. The springs recommend and advertised from CStraub are 1.540" OD Single w/damper 130# @ 1.900" but he says they will install at 1.900 and be right a 150# on the seat. Not sure what open pressure is.

Quote:
Originally Posted by Tom Mobley View Post
https://www.summitracing.com/parts/crn-13801c-16

I don't know how hard these things are supposed to be, but I do know a good file bounces off like a basketball on a concrete floor.
Those are the ones Vintage Musclecar (Eric) is running....quote from him:

https://www.chevelles.com/forums/13-...ml#post3405780
Quote:
Not technically GM rockers, but I'm running .618/.638 (gross) lift on Crane Nitro Carb long slots on my 496 if that helps
https://www.chevelles.com/forums/13-...ml#post3406092
Quote:
Crane advertises their steel rockers as suitable for use all the way up to their 131541 cam which has .648/.669 lift (gross, .622/.643 theoretical net)

-Kevin
1965 Chevy Biscayne
<removed> 454cid, "peanut ports", Voodoo 60201
<coming soon> 460cid, Brodix RRO 270, 229/241 Hydraulic Roller
TH400, 3.36 Stock Rearend
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post #10 of 27 (permalink) Old Jan 25th, 19, 11:32 AM
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Re: Long vs extra long slot BBC stamped rockers

Quote:
Originally Posted by 65cayne View Post
Yes, .600/.570 229/241 HR coming soon. The springs recommend and advertised from CStraub are 1.540" OD Single w/damper 130# @ 1.900" but he says they will install at 1.900 and be right a 150# on the seat. Not sure what open pressure is.



Those are the ones Vintage Musclecar (Eric) is running....quote from him:

https://www.chevelles.com/forums/13-...ml#post3405780

https://www.chevelles.com/forums/13-...ml#post3406092
Ask Chris about the open pressure and if he feels stamped steel rockers will work and last in the long run. If it was me I would consider comp 1620-16 roller rockers.

Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4 wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
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post #11 of 27 (permalink) Old Jan 26th, 19, 12:58 PM Thread Starter
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I understand most people's inclination for roller rockers but I would like to keep my stock valve covers and as mentioned other respectable folks are running the same setup with comparable or more aggressive lobes.

-Kevin
1965 Chevy Biscayne
<removed> 454cid, "peanut ports", Voodoo 60201
<coming soon> 460cid, Brodix RRO 270, 229/241 Hydraulic Roller
TH400, 3.36 Stock Rearend
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post #12 of 27 (permalink) Old Jan 26th, 19, 1:11 PM
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Re: Long vs extra long slot BBC stamped rockers

Quote:
Originally Posted by 65cayne View Post
I understand most people's inclination for roller rockers but I would like to keep my stock valve covers and as mentioned other respectable folks are running the same setup with comparable or more aggressive lobes.
You could use short Polylocks with the roller rockers so they will fit under your oem covers.
Crower makes the shortest
https://www.summitracing.com/int/par...s-16/overview/

But ask Chris first if he feel a good set of stamped steel rocker arms will work.

Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4 wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
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post #13 of 27 (permalink) Old Jan 26th, 19, 1:20 PM
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Re: Long vs extra long slot BBC stamped rockers

I know Mark Jones is selling BBC engines with stamped rockers and the isky 228/238 hydraulic roller cam. No problems at all with the one he built for my friend. Not sure what rockers he uses, but they didn't look like anything special.
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post #14 of 27 (permalink) Old Jan 26th, 19, 5:55 PM Thread Starter
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Re: Long vs extra long slot BBC stamped rockers

edited...
Quote:
Originally Posted by 65cayne View Post
Yes, .600/.570 229/241 HR coming soon. The springs recommend and advertised from CStraub are 1.540" OD Single w/damper 130# @ 1.900" but he says they will install at 1.900 and be right a 150# on the seat and 375# open. Not sure what open pressure is.
Quote:
Originally Posted by Malibu ss 64 View Post
Ask Chris about the open pressure and if he feels stamped steel rockers will work and last in the long run. If it was me I would consider comp 1620-16 roller rockers.
Received a PM from Chris and he stated that it would be about 375# open and that he has many customers running the same cam with stamped rockers and no issues.

So between his feedback and other information I've dug up, I dont see any problem with stamped rockers. I will likely go with either the Crane 13801 or 13801C stamped rockers.

-Kevin

-Kevin
1965 Chevy Biscayne
<removed> 454cid, "peanut ports", Voodoo 60201
<coming soon> 460cid, Brodix RRO 270, 229/241 Hydraulic Roller
TH400, 3.36 Stock Rearend
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post #15 of 27 (permalink) Old Jan 26th, 19, 7:28 PM
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Re: Long vs extra long slot BBC stamped rockers

i remember back in the 80s running my 454 on the street with a big mech cam using gm rockers because i didnt have alot of money . i kept punching pushrods through them when i over revved it doing massive burnouts on the street to be cool. i saved old stock ones and ground the slot myself. the thick comp cams with the roller tips used to be what everyone used. i guess a lot of guys run stamped rockers without issues after reading this
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