55 Intake Manifold Questions

[Robert J.]

My 55 manifold is really different than any I have seen. Please see Pics. It has a date of E / 99 That's it. The heat shield inside is larger than a regular 55 and the porting is very well done? GM kept the car until Sept. of 55 where it was sold as used? I'm not sure what they did with it from Jan to Sept?

[Roy B.]

Re: 55 Intake Manifold Questions

Your's say E199 =May 19 9?= 90's?
But I have you beat here is one I have having NO dates, so I could use it on any dated engine

[Robert J.]

Re: 55 Intake Manifold Questions

Unbelievable.......Mine has a / E / 99 I was thinking that possibly the E was for Experimental I don't have a clue as of why the 99?

[Roy B.]

Re: 55 Intake Manifold Questions

Unbelievable.......Mine has a / E / 99 I was thinking that possibly the E was for Experimental I don't have a clue as of why the 99?

It would be interesting to see how judges would score your's or mine.
By the way what number 55 you have

[Roy B.]

Re: 55 Intake Manifold Questions

Unbelievable.......Mine has a / E / 99 I was thinking that possibly the E was for Experimental I don't have a clue as of why the 99?

You dint know the letter was a month (E) =May
Here is a little trivia about those screw marks at each end of the date.

[Robert J.]

Re: 55 Intake Manifold Questions

#006 That's interesting I saved the Shift Symbols for future Ref. I knew they were shift symbols but not which ones...I still don't understand the 99 part? ..bj

[John H.]

Re: 55 Intake Manifold Questions

Here is a little trivia about those screw marks at each end of the date.

Roy -

I think you'll find the following coding to be correct for the date tag screws and the "casting clock" (the double-dots at 12 o'clock indicate the start of the shift). Info came from fellow NCRS member Mark Gorney at the Saginaw Foundry (now called Saginaw Metal Casting Operations); Mark has been there for over 30 years, and provided me with key research for my 2002 '67 intake manifold survey article in the "Restorer".


The date tag screws indicated the shift when the casting was poured: