some of you might remember the air sucking issue i experienced last fall, i went thru 3 intake gasket sets and even with the thick ones from Best Gaskets (14046 E), it still sucked air. not as much as with the thin metal ones, but enough that the engine would stall when brake cleaner sprayed on between manifold and cyl.head.

now, i took the manifold down again, cleaned the surfaces and mounted it without gaskets but with marking paint on the head side.you can now clearly see that the 2 surfaces are uneven and only seats correctly on the 8 spots where the bolts are. looks like the manifold was tightened too much.

i have to find a machine shop that can make these surfaces even.

Views: 194

Attachments:

Reply to This

Replies to This Discussion

How are the surfaces in heads? That could be checked with metal ruler.

did not check that yet, but i guess the manifold side is more prone to be uneven.

I would double the gasket thickness ( two thin or two thick gaskets both sides ) and see if that would stop the vacuum leak — as you know you manifold or head matching surfaces  are somewhat irregular from your matting  paint test 

A good trouble shooting matting test—- for sure 

Should be the an easier fix than other options if it works — worth a  try ! 
A machine shop can plane the manifold and the head but much more involved and some expense as well 

Not sure if you need to be doing both heads and the intake surfaces 

Machine shop will advise on that 

Many have issues with our intake manifold seal  ( to many )  leaking air ( vacuum leak ) which cause engine performance issue ( cylinders running lean and hotter than normal ) 

Enjoy 

after a winter of filing and fidling both surfaces of the intake manifold it still sucks air on one side, not as much as before, but still not a good idle when hot.

when you look at the new pics, the marking paint test before i mounted the manifold wasn't that bad, especially when you compare it withe the first pics.

guess i have to find a machine shop in my area :(

Attachments:

would gluing on the gaskets with some RTV be a bad idea?  

The rule is to only use the sealer - a few dabs - to be holding the gasket in place 

The gasket will do the job intended 

I think I recall the corners of the intake gasket  needing some sealer 

Using a lot of sealant will make any future repair if needed more time consuming

Nice to get your Caddy back in action 

Enjoy 

Taking look at your photos...have the forward ports been ground on?  They look off-set a smidge to me, but might be camera angle. 

These Caddy intakes are interesting to me. The opposite of a performance manifold. Short runners heading mostly uphill.   Works good for torque, not so good for revs.  

But, of course, who takes their 390 or 429 to redline? Even the transmission short-shifts to prevent that. 

The red line on both the 390 and 429 is ——4,600 rpm so who is looking for revs from these engines ?

These engines are about torque not revs at that redline 

480 lbs of torque is a lot for any gasoline engine to be making

Torque is addictive I have been told —making our year Cadillacs a  very unique driving experience

The 429 engine with the TH-400 trans is an amazing unique combo and driving experience  and why I own mine for 59 years 

Enjoy 

Tony, I totally agree with you on the torque.  That's a main reason these cars feel so nimble.  

My former 1961 Series 62 coupe with only 25k original miles did not feel anywhere as snappy as does my '64.   Yes, it's a different engine and different transmission. That's my point. The 429 and TH400 is a great combination. 

RSS

Photos

  • Add Photos
  • View All

Forum

1964 Cadillac Coupe Deville Wiring plan

Started by Kai Dröse in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 10 hours ago. 7 Replies

Hi from germany,i know here is a many content about wiring plans and so on.but i need the correct wiring plan for my new dream car ;) the passenger window does not work…Continue

64 Fleetwood Trans Issues

Started by Logan Robb in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 on Tuesday. 10 Replies

I've posted a few times about the strange issue I have with the trans on my 64 Fleetwood. When it gets warm and up to temp, I loose 3rd gear, but I never loose reverse. According to multiple sources,…Continue

New Holley, but which one?

Started by Henrik Sonne in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 on Tuesday. 14 Replies

First I will start by saying, I am a newbie. Recently purchased a ´56 HT, which has a 390" from a ´63 in it. I have decided to put a new Holley on it, but not 100% sure which one would be the best…Continue

Shock absorbers and bolts

Started by Sammy in 1963/64 Cadillac Specific Discussion on Tuesday. 0 Replies

Time again to change my shocks. No matter if Gabriel,  ACDelco whatever - don't last longer than 3 or 4 years.Problem is the rubber parts thats gliding out of the bottom.But now I have another…Continue

Blog Posts

WANTED HARMONIC BALANCER BOLT 1964 DEVILLE

Posted by ANGELO MARTINEZ on July 23, 2023 at 10:44pm 3 Comments

  Hope someone can help me to find the harmonic balancer bolt for my 1964 Cadilac Deville 429 engine

in advance, thank you for your help.

Clock ‘64 DeVille

Posted by Matt Vander Hooven on July 23, 2023 at 7:36pm 2 Comments

Is there still a member in the Detroit area that refurbishes clocks?

Matt VH

Spark Plug Heat Range

Posted by Patrick Westphal on July 7, 2023 at 10:00am 3 Comments

I found a diagram that illustrates the main factor in determining a spark plug heat range that I was trying to describe to you during the chapter get together.

Here it is:

 

The main factor is the length of the ceramic insulator from the middle of the spark plug to the tip (where the spark happens)  

The insulator…

Continue

Lower Front End Ball Joints

Posted by Logan Robb on May 11, 2023 at 9:04am 7 Comments

Good Morning all! 



I took the 64 into the shop to have some adjustments completed and in the process decided to have the lower ball joints replaced as was recommended the last time I had it in. I ordered the parts and came into the shop. They quoted me nearly $500 to replace those lower ball joints requiring nearly 4hrs of labor. Now this is a reputable shop and they know me by name here and they will continue to get my business. I am just questioning what on earth is…

Continue

Videos

  • Add Videos
  • View All

© 2023   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service