Problem with 1963 390 engine restoration

[dneu]

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

[Dave Shepherd]

Some info missing, lifters are original?, Camshaft also?  So how did the new pushrods  wind up .150 longer than original?

[Jason Edge]

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.

[Dave Shepherd]

Rock auto lists the 63 pushrod as 9.130, as you said , 9 1/8..

[russ austin]

Did you install the rocker arm mount blocks upside down? That will change the height of the rocker arm.

[dneu]

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.

[35-709]

Dusan --- be careful what you promise, Russ has VERY expensive taste!   

Good call, Russ!

[russ austin]

Just read the thread. Glad to help out.