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112293 Posts in 12900 Topics by 4937 Members
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16  Camaro Research Group Discussion / Decoding/Numbers / Harmonic Balancer GM part number.... on: February 09, 2012, 06:16:54 PM
Greetings.   Wondering if anyone knows the correct GM part number for the correct harmonic balancer for a
1969 350 cu in 300 horse engine?
I was given the part number of 6272222 as correct for this application, but not sure. Any help would be appreciated!

A link to, or listing of, harmonic balancers for 1st gen Camaros would be great!

Thanks in advance.
17  Camaro Research Group Discussion / Maintenance / Re: "Hot Slot" equipped cast iron intake manifold modifications.. on: February 08, 2012, 02:30:50 PM
OK, thanks for the update regarding just one gasket used at the factory for a Rochester 4 bbl and cast iron itake setup on the '69 SS350, with the "hot slotted" gasket against the intake, and the stainless steel baffle plate against the carb.
I also found the stainless steel baffle online. So, here's my plan: Plug the intake manifold hot slot at both ends. Use an intake manifold gasket that has the center port opening to allow exhaust gases to rise and pass thru the intake manifold to allow the intake manifold's well mounted thermatic choke to get warm so that it'll open in a resonable time. Use the stainless steel baffle under the carb, and I may put a gasket on both sides of the baffle to ensure a good seal and to keep the carb a bit cooler. Use a working heat riser on the exhaust manifold. And, afterwards, I can test the setup, watching for proper choke and heat riser operation, and if I determine the exhaust manifold heat riser action is not needed, I can easily wire it open.
A special thanks to Dave in PA for the heat riser fact and fiction article, and to others who have repeatedly mentioned the hot slot problems and plugging fix. It would be cool if someone has the original GM hot slot manifold recall document link or pdf, etc., as I don't think we've discussed what GM's repair  procedure was back then when the recall was active. Wonder what a Chevy dealer would say if I showed up with my '69 and demanded they perform the recall ??    Grin  Shocked     
18  Camaro Research Group Discussion / Maintenance / Re: "Hot Slot" equipped cast iron intake manifold modifications.. on: February 05, 2012, 07:05:02 PM
OK, thanks guys, I think I'm getting the picture now as to how to proceed, I'm in Wisconsin, and will only use the car during warmer weather, and since it rarely gets "Arizona hot" around here, I don't have to worry about ambient outsire air temperature extremes. The only remaining issue is regarding the stainless steel baffle plate that was originally factory installed between the carb baseplate and the carb gasket. (Which I don't have)  I believe there was a gasket installed on both sides of this plate, and this plate was installed to eliminate vacuum leaks between the hot slot and the manifold intake ports.  Is this baffle plate no longer needed if both of the hot slot holes are blocked? I plan to drive 7/16 inch steel freeze plugs into the hot slot holes.
19  Camaro Research Group Discussion / Maintenance / Re: "Hot Slot" equipped cast iron intake manifold modifications.. on: February 03, 2012, 10:15:40 AM
Thank you 67-Z27 ! Great picture, too!
I tend to agree with you about leaving the heat riser intact.
An added reason to leave the heat riser to operate normaly is the mechanical heat-operated Rochester choke mechanism mounted on the intake manifold. Perhaps leaving the heat riser
intact helps this choke to function as intended?
More input from others on this topic will be appreciated! 
20  Camaro Research Group Discussion / Maintenance / "Hot Slot" equipped cast iron intake manifold modifications.. on: February 03, 2012, 12:52:55 AM
It has been frequently mentioned herein to plug the two "hot slot" holes in intake manifolds used on Q-Jet cars with two 7/16 steel freeze plugs, as a fire prevention measure. Other enthusiast websites have similar recommendations to perform this measure, with the added suggestion to also modify the exhaust manifold heat riser valve by removing the round metal plate from the shaft inside the heat riser.
Is it advisable or nessessary to remove the plate from inside the heat riser when plugging the hot slot holes? 
Perhaps JohnZ can chime in on this with his thoughts.
As always, Thanks!
21  Camaro Research Group Discussion / General Discussion / Sources for carburetors... on: November 16, 2010, 08:36:51 PM
Anybody got reliable, trustworthy sources for Rochester carbs?
I'm looking for a decent 7029203.

Thanks in advance.
22  Camaro Research Group Discussion / Maintenance / Re: Compression test results... on: November 13, 2010, 01:36:14 PM
OK, John...that makes sense, and is supported  by the specifications chart in the chassis book.
Thanks for bringing the spec chart to my attention, as now I know that my engine(s) are within the acceptable range.

23  Camaro Research Group Discussion / Maintenance / Re: Compression test results... on: November 11, 2010, 03:59:26 PM
OK, John...thanks for the reply. It sure would be nice to know what is considered OK for amount of variation i.e., as a percentage, between cylinders.

Also, your statement about high performance engines being generally lower (150 psi), seems conter-intuitive, as one would assume high performance naturally aspirated engines have generally higher compression ratios, hence a higher compression test result, rather than a lower result.

As always, thank you for your contributions!
24  Camaro Research Group Discussion / Maintenance / Compression test results... on: November 10, 2010, 04:54:57 PM
Hey...what is the rule of thumb for compression test results? I've heard that cylinders should not be more than 15% variation between the highest compression cylinder and the lowest.
So, if the highest cylinder reads 140 pounds, the lowest should not be lower than 119 pounds.
Does this sound resonable?
Also, if an engine delivers compression test results in the 180 pound range, does this reading seem like a high compression engine that would require premium fuel?
Is there a guide for proper compression readings, such as what should a healthy good old 210 horse 327 show on the tester, or how about a 300 horse 350?   
25  Camaro Research Group Discussion / General Discussion / Re: Trouble with authenticity on: April 01, 2010, 04:02:04 AM
Are you saying that your marriage will turn into a Chevy Chase movie?

 Roll Eyes

26  Camaro Research Group Discussion / General Discussion / Selling Camaro, agent offers to list car on multiple internet sites for 5 % on: March 29, 2010, 10:01:18 AM

Anyone have experience with agents who will list a car for sale on multiple internet sites for the seller, in exchange for 5 % of the sale price?

Not sure if there is a contract involved, or how this arrangement works.  Huh

Sorry if this topic has been started previously, a link to earlier discussions, if any, would be appreciated.

Thanks to all....
27  Camaro Research Group Discussion / Mild Modifications / Re: Flywheel on: May 21, 2009, 07:29:29 PM
Hey jpic....

Just curious how your project is coming....I did this same swap last fall, and it is well worth the cost and hassles. Makes for a whole new experience and fun driving. 

Have you determined which rear end ratio your car has? The standard rear end ratio supplied w/ most automatics will be a bit "tall" for a stick shift trans.

By the way, where did you find the Muncie, and what shifter will you be using?

Good luck....!
28  Camaro Research Group Discussion / General Discussion / Re: dying Vinyl roof on: April 20, 2009, 06:42:23 PM
Hey Dave...

Nice results on the dye job, my Camaro vinyl is not in need now, but may in the future.

I am also in South East Wisconsin, just waiting for the car show season to get rolling.

Where is the Auto Shop located ? Always good to find reputable shops nearby.

I might give them a call ! 

Thank you!
29  Camaro Research Group Discussion / Maintenance / Re: Stupid ??? How do you change the oil in a Muncie? on: March 25, 2009, 04:16:39 AM
As a side note, when I last changed my Muncie lubricant, I used a 50/50 mix of one half standard 30 weight motor oil and one half pancake syrup as a thickening agent to boost viscosity and enhance the oil's ability to bond to the gearsets.

A benefit of this mixture is sweet, buttery shifts.

In addition, on hot summer days, after a couple hours of driving, a wonderful "maple-y" aroma fills the passenger compartment, wafting up through the console.

Although, a somewhat creepy apparition is sometimes seen in the rear view mirror, a ghostly image of Aunt Jemima in the back seat.


30  Camaro Research Group Discussion / General Discussion / Re: From, The first TV commercial for the all new '67 Camaro on: February 05, 2009, 01:43:11 PM
Glad ya liked it, maroman...

I'm surprised that no one else thought the commercial was as cool as you and I do.

Maybe no one else watched it?  It does a take a little while to load, but well worth the wait.

Oh, well, here's that link again for anyone who wants to watch it, then hopefully post a comment with thoughts or memories...

Just click on the following link...

Enjoy ....  !!!
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