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#1
08-13-2020, 12:18 PM
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Early rocker arm question here!
Ok , what the heck is different about 1959 389 rocker arms other then the oil feed hole that would not allow the usage of 1964 and up rocker arms on a 1959 motor?
Thanks in advance to anyone who can shed some light on this!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#2
08-13-2020, 02:58 PM
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The valve stem side of the later rocker arm is longer. If you can get good rocker arm geometry and the pushrod rides in the proper location they will interchange.
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#3
08-13-2020, 06:55 PM
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64-65-66 are diff from 67 up.I have used 65-66 on early non pushrod oiling with no issues.Never tried 67 and up.Tom
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#4
08-13-2020, 07:12 PM
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Quote:
This picture does not show a '59 rocker arm. '59 rocker arms do not have an oil spurt hole.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
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#5
08-13-2020, 07:22 PM
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Egge Machine implies that '55-60 are different than 61-63 and offer both.
The 55-60 rockers have reduced size push rod oiling to supplement the stud oiling, this would appear to be a pretty novel offering.
__________________
"At no time did we exceed 175 mph. Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea... Still have my 1st Firebird 7th Firebird 57 Starchief |
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#6
08-13-2020, 07:29 PM
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1964 and earlier rocker arms had no pushrod oil hole. The exception is the 1964 GTO and 421 engines with 9770716 heads. They did have the oil hole for rocker lube through the pushrods. All 1964 and later Pontiac rocker arms did have the oil hole.
I was not aware of a problem using late rocker arms on a pre '65 engine that lubed the rocker arms through the rocker studs. I'm sure it has been done. What would be the issue? Are the '67 and up rockers different than pre-'67?
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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#7
08-13-2020, 07:31 PM
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Yes Dick they are.Also 63 421HO engines got the pushrod oil along with the 61-63 SD heads.Tom
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#8
08-14-2020, 04:15 AM
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1967 1:st design w/o guide plates uses the 389 style rockers.
1967 2:nd design w/guide plates uses the 1968 and later (exc. RAIV) rockers . Itīs all about the valve stem angle. |
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#9
08-14-2020, 05:21 AM
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Thanks all!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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