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Factory Stamped Rocker Arms? #2652678
05/06/19 04:50 PM
05/06/19 04:50 PM
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New York
rarefish Offline OP
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I have a bunch of loose stamped rocker arms. What is a quick way to ID the small block rocker arms from the big block ones?

Re: Factory Stamped Rocker Arms? [Re: rarefish] #2652679
05/06/19 04:52 PM
05/06/19 04:52 PM
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BradH Offline
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BB have L and R pushrod seat offsets; SB are centered, IIRC

Re: Factory Stamped Rocker Arms? [Re: BradH] #2652681
05/06/19 05:03 PM
05/06/19 05:03 PM
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Supercuda Offline
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They both have an L and an R rocker.

the number stamped on them is usually that last two of the part number but I'll be danged if I remember the numbers anymore.


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Re: Factory Stamped Rocker Arms? [Re: Supercuda] #2652697
05/06/19 05:52 PM
05/06/19 05:52 PM
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Lincoln Nebraska
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RapidRobert Offline
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SB: the OE ones have a pronounced L/R offset but I have some replacement SB ones from the dealer & the pushrod round recesses look "almost" centered (I was expecting the offset) & no numbers just a "X" on the horizontle oil deflector tab on the top side above the pushrod oil hole. Pedestal slot is a weak 7/8" long/strong 5/8" wide.


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Re: Factory Stamped Rocker Arms? [Re: RapidRobert] #2652700
05/06/19 05:55 PM
05/06/19 05:55 PM
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Supercuda Offline
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Originally Posted by RapidRobert
SB: the OE ones have a pronounced L/R offset but I have some replacement SB ones from the dealer & the pushrod round recesses look "almost" centered (I was expecting the offset) & no numbers just a "X" on the horizontle oil deflector tab on the top side above the pushrod oil hole. Pedestal slot is a weak 7/8" long/strong 5/8" wide.


Pretty sure you are either talking about magnum rockers or speaking chevy

LA rockers don't have a slot. Or an oil deflector tab.

I assume he's talking about LA rockers because if they were magnum rockers it'd be real obvious.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Factory Stamped Rocker Arms? [Re: Supercuda] #2652702
05/06/19 05:56 PM
05/06/19 05:56 PM
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Lincoln Nebraska
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RapidRobert Offline
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You are correct brother, magnums. Too much going on upstairs! (too many projects).


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Re: Factory Stamped Rocker Arms? [Re: Supercuda] #2652703
05/06/19 05:57 PM
05/06/19 05:57 PM
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mopars4ever Offline
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3418424 and 3418425 were the mopar part numbers for small block 340 360 70-78 and later 318 maybe other years too. not sure of the stamped number Edit: one on ebay had 210RT on it if that helps. Any numbers on yours??

Re: Factory Stamped Rocker Arms? [Re: mopars4ever] #2652707
05/06/19 06:13 PM
05/06/19 06:13 PM
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Supercuda Offline
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As are 3004716 and 3004717,

2536145 and 2536146

4095708 and 4095709

4100774 and 4100775

depending on the year. Probably a couple others too.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Factory Stamped Rocker Arms? [Re: Supercuda] #2652857
05/07/19 08:21 AM
05/07/19 08:21 AM
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Posts: 2,252
New York
rarefish Offline OP
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I had believed that the B/RB rockers were a little longer than the SB rocker arms. Can anyone confirm that there is a length difference between the two?

The ones that I have look at so far are stamped F2RT and F5LT and a few have a stamped triangle with a P in the middle.

Last edited by rarefish; 05/07/19 08:36 AM.
Re: Factory Stamped Rocker Arms? [Re: rarefish] #2652871
05/07/19 08:59 AM
05/07/19 08:59 AM
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Leucadia, Ca.
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vdriver Offline
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Originally Posted by rarefish
I had believed that the B/RB rockers were a little longer than the SB rocker arms. Can anyone confirm that there is a length difference between the two?

The ones that I have look at so far are stamped F2RT and F5LT and a few have a stamped triangle with a P in the middle.


Small block roughly 3.03"; big block 3.3".

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Re: Factory Stamped Rocker Arms? [Re: vdriver] #2654538
05/12/19 10:52 AM
05/12/19 10:52 AM
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Posts: 2,252
New York
rarefish Offline OP
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Originally Posted by vdriver
Originally Posted by rarefish
I had believed that the B/RB rockers were a little longer than the SB rocker arms. Can anyone confirm that there is a length difference between the two?

The ones that I have look at so far are stamped F2RT and F5LT and a few have a stamped triangle with a P in the middle.


Small block roughly 3.03"; big block 3.3".


Thanks... I was at a friend's shop yesterday who had a set of BB rocker arms and I also read 3.3" on them.

Re: Factory Stamped Rocker Arms? [Re: rarefish] #2654583
05/12/19 12:34 PM
05/12/19 12:34 PM
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God's Country Maryland
GODSCOUNTRY340 Offline
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Small block rockers are 3 1/16" end to end and big block are 3 5/16" for those that just want to measure with a tape measure.


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