Rocker arm comparison for BB
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
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Rocker arm comparison for BB
I have a set of BB NOS "L" stamped rockers and a set of NOS "H" stamped that also say "Made in Canada." Does anyone know if these two rocker arms are same. Are they both nitrated?
Anyone have any information on this. Thanks, Terr
Anyone have any information on this. Thanks, Terr
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,334
From: North of Toronto - Ontario
just found this reference
H Rockers were used on later high performance engines 1970 and up. #3959182
L Rockers were used on early high performance engines 1969 and down. #3860308
X Rockers were used on 1965-66 high performance engines.
and
"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.
M
H Rockers were used on later high performance engines 1970 and up. #3959182
L Rockers were used on early high performance engines 1969 and down. #3860308
X Rockers were used on 1965-66 high performance engines.
and
"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.
M
Last edited by Mooser; Nov 23, 2023 at 08:39 PM.
