Author Topic: Problem with 1963 390 engine restoration  (Read 212 times)

Offline dneu

  • Posts: 3
  • Name: Dusan Neumann
Problem with 1963 390 engine restoration
« on: January 11, 2018, 11:06:03 AM »
I am restoring 1963 convertible. A complete engine overhaul. After I assembled the engine with almost all new parts I have encountered a strange problem - almost all valves are open. It looks like pushrods are about 0.15" longer. Hydraulic lifters are filled with oil and rock solid. I do not have any explanation for this mystery. Before I shorten pushrods - what I see as an only solution - have anybody experienced such problem? Any advice will be appreciated. Dusan

Online Dave Shepherd

  • Posts: 1961
Re: Problem with 1963 390 engine restoration
« Reply #1 on: January 11, 2018, 11:53:58 AM »
Some info missing, lifters are original?, Camshaft also?  So how did the new pushrods  wind up .150 longer than original?

Offline Jason Edge

  • Posts: 688
    • CLC Member
      CLC Member #14225
  • Name: Jason Edge
Re: Problem with 1963 390 engine restoration
« Reply #2 on: January 11, 2018, 05:29:12 PM »
Pushrods are the same for 1963 to 1966 Cadillac engines (parts group 0.426 part # 147 8094). I am going to guess you have the 1958 to 1962 style push rod that I believe would be a bit longer do to different size blocks. The 1963 390 was a completely redesigned engine from the 1962 390 with different size and shape, and need internals for the 1963 390 when rebuilding. I measured one of my 63 to 66 pushrods and they measure almost exactly 9 1/8" in length.
Jason Edge
Director CLC 1963-1964 Cadillac Chapter - www.6364Cadillac.com
email - jasonedge@nc.rr.com
1964 Coupe DeVille - http://bit.ly/1WnOQRX
2002 Escalade EXT
2012 SRX Performance Edition

Online Dave Shepherd

  • Posts: 1961
Re: Problem with 1963 390 engine restoration
« Reply #3 on: January 11, 2018, 05:41:53 PM »
Rock auto lists the 63 pushrod as 9.130, as you said , 9 1/8..

Offline russ austin

  • Posts: 595
  • Name: Russ Austin
Re: Problem with 1963 390 engine restoration
« Reply #4 on: January 11, 2018, 06:04:56 PM »
Did you install the rocker arm mount blocks upside down? That will change the height of the rocker arm.
R.Austin

Offline dneu

  • Posts: 3
  • Name: Dusan Neumann
Re: Problem with 1963 390 engine restoration
« Reply #5 on: January 12, 2018, 05:04:46 AM »
thank you. I have measured everything, but this did not cross my mind.  The head bolt could be inserted only from one side - and that was the problem. I had switched bolts and it solved the problem. How dumb I was.  Russ Austin - if we ever meet, I buy the best shot you will want.

Online 35-709

  • Posts: 2890
  • The most valuable antique is an old friend.
    • CLC Member
      CLC Member #4719
  • Name: G. Newcombe
Re: Problem with 1963 390 engine restoration
« Reply #6 on: January 12, 2018, 08:50:58 AM »
Dusan --- be careful what you promise, Russ has VERY expensive taste!   ;D

Good call, Russ!
1935 Cadillac Sedan resto-mod "Big Red"
1973 Cadillac Caribou - Sold
1950 Jaguar Mark V Saloon resto-mod

 

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