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Old 07-13-2019, 09:43 PM
ted ted is offline
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Default BBC Rocker Arms

Is there any difference in engine application between a rocker arm with an (L) or
a rocker arm with an (H) ?

Thanks in Advance!
Ted
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Old 07-18-2019, 03:40 PM
ted ted is offline
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Good morning gentlemen!!
I have tried the Google method(s) on these 2 BBC rocker arms and the responses are kinda all over the place re. the correct dates of SHP usage.
L rockers are good for 1965 - 1969 inclusive engine setups.
H rockers are good for 1970 and up engine setups.
Am I correct or not re. the dates?
Thanks!
Ted
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Old 07-18-2019, 11:22 PM
L72Chevelle L72Chevelle is offline
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Default Hope this helps.

There were different rocker arms used for different big block applications over the years. Here's the deal:



"no marking" rockers-----these are most likely aftermarket pieces. Most aftermarket are unmarked. However, I believe that they may also be GM #3860305 which were used for 1965-72 non-SHP applications;



"L", "Z", or "X" tip marking----GM #3860308. Used for 1965-69 with SHP and 67-E69 L-88. Also, replaced the 3860305 for SERVICE effective February, 1972;



"M"-----GM #6258611-----used for 1973-74 all big block. Also, became SERVICE for 3860308 effective Novemeber, 1972; currently replaced by GM #10112680



"H"-----GM #3959182---used for L69 L-88, all 1969 ZL-1 and 1971 LS-6. Currently replaced by GM #12368082 which is a kit which includes 1 GM #3959182 rocker + ball and nut.



There was no "N" that I know of; you may be mistaking a "Z" or an "M"
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Old 07-21-2019, 02:42 PM
ted ted is offline
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Thanks L72 Chevelle re. the BBC rocker arms.
On the 'no marking' rockers, I have to say I believe the arms are GM .. I have a set and they do not appear to be aftermarket issues, but, as you wrote, 1965 - 72 non SHP units.
Merci Encore L72 Chevelle
Ted
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Old 07-21-2019, 02:54 PM
ssl78 ssl78 is offline
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GM rockers that were not long slot had no markings only rhe long slot rockers were marked. Solid lifter big blocks up to 69 had L and after 69 they had a H. I do not believe there was any difference in the 2
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Old 07-21-2019, 04:21 PM
L72Chevelle L72Chevelle is offline
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Just a note, That was found on the web and sent to me from a friend. Just passing it along not trying to steel credit. Phil
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Old 07-31-2019, 01:50 PM
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Thanks lads!! Much Appreciated . .
Ted
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