63 engine over spray patterns

[Jack H.]

Re: 63 engine over spray patterns

It's hard to be positive from pictures without being there to get up close and personal, but the cylinder head comment flows from one secondary operation known to exist between Saginaw/Flint and Tonawanda. That's the milling process used to reduce the 'overhang' of the casting ID marks on the ends of the heads, Rob.

Tonawanda left their heads 'raw'--as cast, it terms of the ID marks (the 'double hump' feature). Saginaw heads were cast and as part of the casting to finished head secondary operations, the ID marks were milled down. That resulted in their surfaces being smooth (relative to adjacent head surface texture) and their being thinner in terms of protrusion...

That's my guess about the prior comment.

[Chuck W.]

Re: 63 engine over spray patterns

Rob,

Is your chromed dip stick tube correct?

[Timothy B.]

Re: 63 engine over spray patterns

Rob,

I think the water pump hub and shaft should be free of orange. Here's a pic of the rear breather grommet off October 1962 built 327/300hp engine.

https://www.forums.ncrs.org/showthread.php?t=74664

[Rob M.]

Re: 63 engine over spray patterns

Rob,

I think the water pump hub and shaft should be free of orange. Here's a pic of the rear breather grommet off October 1962 built 327/300hp engine.

https://www.forums.ncrs.org/showthread.php?t=74664

This threads talks about a Early and Late version with a (uncertain) cut over date of May 5, 1963. My car is very late (July 2, 1963), so can I conclude from this thread I should have the all rubber grommet?

Why would they bother with masking of the pump hub and shaft in the factory? It would only mean more work and doesn't serve any (cosmetic) purpose?

regards,
Rob

[Michael H.]

Re: 63 engine over spray patterns

This threads talks about a Early and Late version with a (uncertain) cut over date of May 5, 1963. My car is very late (July 2, 1963), so can I conclude from this thread I should have the all rubber grommet?

Why would they bother with masking of the pump hub and shaft in the factory? It would only mean more work and doesn't serve any (cosmetic) purpose?

regards,
Rob

In a previous post last year, one poster with a car in the 20,xxx range said he had the steel sleeve and grommet style.

The flange and part of the shaft were not painted. The hub of the water pump would have been shielded to prevent paint from getting into the threaded holes in the flange. Paint in the threads could have been a problem on the line when the fan/clutch was installed.

[John D.]

Re: 63 engine over spray patterns

Thanks all for the feedback, does anyone know if someone is selling a better repro of this grommet or even better where I would get an original one?

regards,
Rob.

Rob, Engine looks very nice. From the start of production to about May 63 the Corvette Flint engine did not use a rubber grommet for the PCV per say. Just like Hanson said.
My 63 is 9900 or so. Does not have the later style readily available grommet. Has a sleeve and hard rubber grommet assembly pressed into the block. Logo on the real deal rubber grommet is GM and also R52. Now the R could also be a JR with the two letters jammed against one another.
Many of the passenger cars and trucks used the same sleeve, grommet assembly.
A rubber grommet is readily available from NAPA or Corvette repro catalogs.
LI makes a repro sleeve,grommet assembly. JD

[Bob J.]

Re: 63 engine over spray patterns

In a previous post last year, one poster with a car in the 20,xxx range said he had the steel sleeve and grommet style.

The flange and part of the shaft were not painted. The hub of the water pump would have been shielded to prevent paint from getting into the threaded holes in the flange. Paint in the threads could have been a problem on the line when the fan/clutch was installed.

Michael, I believe Lynn Houk reported his July 10 1963 built 63 , engine assembled July 7 1963, has the original EARLY style steel/rubber grommet.
Don't think any of those later (2nd) style all rubber grommets were ever documented as original for 1963 Corvettes.
Bob

[Michael H.]

Re: 63 engine over spray patterns

Michael, I believe Lynn Houk reported his July 10 1963 built 63 , engine assembled July 7 1963, has the original EARLY style steel/rubber grommet.
Don't think any of those later (2nd) style all rubber grommets were ever documented as original for 1963 Corvettes.
Bob

Yup, that's getting pretty close to the end of 63 production. I would be surprised if any 63's had the new one piece style grommet.

[John D.]

Re: 63 engine over spray patterns

Rob, I gave you some bad info on the sleeve grommet versus just the rubber grommet. I said the sleeve grommet assembly was only used until May. Actually it was used much later than that.
How late I do not know. JD

[Rob M.]

Re: 63 engine over spray patterns

ok, I think I need to start a hunt for the early type grommet and sleeve and remove some paint here and there...

regards,
Rob

[Rob M.]

Re: 63 engine over spray patterns

BTW, I'm surprised nobody noticed the hole in my left hand exhaust manifold...

[Bob J.]

Re: 63 engine over spray patterns

BTW, I'm surprised nobody noticed the hole in my left hand exhaust manifold...

But we did notice your water pump bolt lock washers

[Michael H.]

Re: 63 engine over spray patterns

BTW, I'm surprised nobody noticed the hole in my left hand exhaust manifold...

I see a hole for the choke tube in the left manifold. That would be correct. Or, is there another hole that I'm missing?

[Michael G.]

Re: 63 engine over spray patterns

Here's my 63 paint. I think the silver overspray is correct, but I don't know about the orange paint on the water pump by-pass clamp and hose. Any input would be great.

[Michael H.]

Re: 63 engine over spray patterns

Here's my 63 paint. I think the silver overspray is correct, but I don't know about the orange paint on the water pump by-pass clamp and hose. Any input would be great.

Needs more orange on the hose. Lots more. Probably could use a bit less dull aluminum on the rear of the hose. I'll see if I can post a pic of a new engine that shows the painted hose.

(I think your heater hose routing is incorrect) (see, that's what happens when ya post pictures of your engine)