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|January 29th, 2018 at 5:26.12 pm#1|
I just bought a 1967 425 and it does not have the "drill mark" on the front ledge. I heard there are two different lifter angles such as 39 and 45 degree. What does a 455 have for a lifter angle. How do I know what I have? What is good and what is bad? Please help!
|February 12th, 2018 at 5:20.53 pm#2|
All 455's are 39° cam bank angle. For that matter, all '68 and up Oldsmobile engines are 39° cam bank angle.
Nothing wrong with a 45° cam bank angle, just make sure the cam you use is ground for a 45° block.
Or you can open up the pushrod clearance holes in the heads and use a 39° cam.
If the engine is from a '66-'67 Toronado it should be a 39° cam bank angle with .921 diameter lifters.
|February 12th, 2018 at 5:26.15 pm#3|
Thanks for the reply. It came out of a 67 delta 88. How do you measure the cam bank angle? I need to know how to measure the angle, so I can order the correct cam.
|February 13th, 2018 at 4:10.21 pm#4|
If it is for sure a '67 block, it is most likely a 39° cam bank angle.
check out this thread over on classicoldsmobile.com
|February 13th, 2018 at 4:28.58 pm#5|
The post above is most likely correct. I don't know if it accurate in all cases.
Also look for a drill spot on the rib between the oil fill tube hole and the engine casting number D 389244.
Drill spot = 39°,no drill spot = 45°. you can also look on http://www.442.com/oldsfaq/oldsfaq.htm
Not sure all the info there is accurate or up to date. All of the blocks I have worked with were '68 and up so
no first hand experience with 45° blocks.
|February 13th, 2018 at 5:28.05 pm#6|
I just talked to Jr. at Olds Rocket Parts who is a great guy. He said all true 67 manufactured 425 blocks were 39 degree. He said also if it had "C" heads on it, it is a 39 Degree for sure. Jr. said the 66 blocks that had 45 degree cam angle used a "B" head. The "B" head has a different push rod hole position in the head. He said the push rods would bind and not clear the push rod hole in the head correctly, if you had a 45 degree block and used a "C" head on it.
|February 14th, 2018 at 4:24.19 pm#7|
That is why I said you could open up the pushrod holes.
|February 15th, 2018 at 7:09.25 am#8|
Personally, I'd go to Bernard Mondello
|February 15th, 2018 at 4:03.38 pm#9|
I wouldn't buy anything Oldsmobile coming from Paso Robles Ca.
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