#1  
Old 07-02-2016, 09:36 AM
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GaryK GaryK is offline
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Quote:
Originally Posted by trynsave View Post
62 and 63 camshafts are not interchangable
What are the differences? I never heard this before.

  #2  
Old 07-02-2016, 01:09 PM
trynsave trynsave is offline
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its been 30 years since I built one..so my memory isn't real clear-but I think the rear cam journal is larger

  #3  
Old 07-03-2016, 09:55 AM
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c5farmer c5farmer is offline
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Default T4 camshafts

The Pontiac parts manual list the camshaft number for 61-63 T/4 engines with the same cams...pn 539099 (J) for dual valve springs and pn 537995 (H) for single valve springs. They are interchangeable. Same cams were used in all 3 years.

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Old 07-03-2016, 10:34 AM
trynsave trynsave is offline
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ok-like I said.... 30 years ago-I just remember the something wasn't the same inside the block

  #5  
Old 07-04-2016, 10:56 PM
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c5farmer c5farmer is offline
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Trynsave, I forget stuff a lot quicker than 30 years ago ! You may have been thinking about the way Pontiac controlled the compression ratio in the 4cylinders. 61-62 it was controlled by the piston domes and 63 by cylinder head combustion chamber size.
About the only differences I know of.

  #6  
Old 07-04-2016, 11:04 PM
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65nss4spdGTO 65nss4spdGTO is offline
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I have a couple of engines, also a nice build in the process.

Call me if you want to discuss.

Calvin Hill
Hill Performance
708-250-7420

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