Messages

1

General Discussion / Re: Crossram Package

« on: May 25, 2018, 11:49:30 PM »

In 1968 and 69, the car with the crossram didn't fit well into any NHRA stock class as that organization didn't allow multiple carburetors unless it was a regular production option. We weren't prepared, or quick enough to compete in NHRA D/MP class at that point though so we ran the rest of the season with the original 1x4 Holley back in place.

Over the winter of 1969/70, after some back yard cyl head work, installation of the 140 cam and 142 valve springs and reinstallation of the 2x4 and a 5.57 rear end, we ran all of the 1970 season in D/MP. We won our share but lost several too. We did win the very last event of the year though. That  was the last time we ever had the crossram on an engine. The car ran a best of 11.79 in 1970. I sold the crossram in 1971 for $250 minus the cold air plenum/elbow.

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General Discussion / Re: Crossram Package

« on: May 25, 2018, 12:12:34 AM »

The new replacement short block before installation. (wonderful GM warranty) I set the crossram on it just for the picture.

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General Discussion / Re: Crossram Package

« on: May 23, 2018, 01:26:05 AM »

The paperwork came later, not with the crossram. Probably summer of 1968 but I'm not sure. It came from someone that I knew at GM.

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General Discussion / Re: Crossram Package

« on: May 22, 2018, 07:03:54 PM »

At some time around spring/summer of 1968, GM sent a packet of about 20 pages of information to several people that were racing Z28's. Most topics were about chassis setup, roll cage installation and other modifications, mostly for road racing. Two of the items on the last two sheets that I remember discusses the crossram and a few modifications that engineering recommended. One had to do with what they called "drivability due to high throttle effort". The correction was to remove the throttle lever (inside the car) and, with a saw, remove one inch of the rod and reweld. The shorter rod would reduce throttle effort required.

The other was a reported lean condition at lower throttle openings. Because the secondaries were mechanically operated by a cam and roller, modifying the cam slot would bring the secondary in a bit later. I'm sure most of the 1st design carburetors found today had this modification. Below is the GM/engineering drawing that was sent.

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General Discussion / Re: Crossram Package

« on: May 19, 2018, 11:34:23 PM »

Robert,

Yes, the shield came from me decades ago. I just read page 86 in Wayne's book and he does state that the shield was not included in the list of parts that came with the 2X4 package. The original parts list (not the one that I have that came with my 2X4 package) from GM files deletes three parts, item's #2,#3 and #4. I'm assuming that one of those items was the 3841134 shield. Unfortunately, I don't have any further information on the shield or it's part number. I'll compare the rest of the numbers on my original list to the sheet I have from GM files to see what else was deleted or changed. I do know that the last list from GM files showed the new Holley Carburetors, I think 4295's?

My original parts list that came with the crossram had not only the list of part numbers but also a note at the top that read something like; to be sent to individuals per Vince Piggins. Interesting that there were a few typos in the text. Someone was in a hurry while typing.

 

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General Discussion / Re: Crossram Package

« on: May 19, 2018, 06:00:54 PM »

We switched to drum brakes in front to reduce weight. I don't remember the difference but my partner may remember. We weighed all of the components that were removed and compared to the items that we reinstalled. We were trying to reduce total car weight to fit the D/MP class and weight off the front was the best place to do that.

We even removed the front sway bar and some of the front bumper brackets. Also swapped radiators with the friends 67 because his was a single row.

When we added the roll bar, that added a little weight so we had to find and remove weight from some other location.

With a 302" motor, our minimum NHRA legal weight had to be 3020 lbs and the car usually went across the scale at around 3050.

For classes D/MP and lower, there was a rear tire rule that spec's that the slicks had to be "street legal", tread width no more than 7" and have two full circumference grooves of 1/8" minimum. (silly rule but that was NHRA) Traction was an issue.

Another item that we changed were the front coil springs. Front end lift was important with the 7" slicks so I thought springs from a 6 cyl Camaro would work but my partner suggested we try springs from a 4 cyl Nova. That worked!

Had I known what these cars would be worth in the future, I would have saved all the original parts.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 02:26:46 PM »

To reduce car weight, I traded the disc brakes for drum brakes with a friend that had a 67 Camaro. I also gave him the brake booster. The car had to weight about 3050 minimum to fit into the D/MP class.  D/MP was 10 lbs/inch at that time.

The 4" Cragar wheels fit without spacers.

I'll dig out the VIN.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 04:02:44 AM »

Unfortunately, parts of the original 302" block and several internal components are pretty much scattered along the sides of the big end of Great Lakes Dragaway in Wisconsin.

I've run the VIN through a few different sources without success.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 03:30:12 AM »

I found a picture of the cold air plenum. I'm told this was a 1st design plenum but I don't know what the difference is.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 03:20:36 AM »

I raced the car in NHRA D/MP class until about 1971. I then sold the car less engine in about 1972. The buyer installed a 358" small block and continued drag racing for a year or two. It then went to someone that stored for several years, then it disappeared. A friend of mine said he saw the car completely restored back to original at a car show about ten years ago but he didn't get the owners name. I ranm the VIN a few times but no results.

Well maybe it will surface again. What became of the motor that you held onto?

The 305" motor eventually went into a friends 64 Nova with Enderle injectors for street use. LOL. The crossram sold to a guy in southern Illinois for $250. minus the cold air setup.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 03:16:44 AM »

The package also included the four blueprint installation instruction drawings and parts list. I made copies of those sheets many years ago and my GF was selling the copies on ebay. I think several folks have made copies of my copies and still sell on ebay. I sold what must have been the 1st design cold air plenum about 20 years ago too. 

Michael,

I bought a set of those years ago on eBay, 1968 dated prints with the crossram plenum A/C setup clearly shown on the prints. I'm glad to have them, always wanted to find a set of '69 prints to verify what I had collected for my "cloned" crossrams I built over the years.
Always impractical for the street, but visually impressive to say the least.

Welcome to the CRG -

Regards,
Steve

Thanks Steve. Your copies are most likely copies from my originals. I think only very early 2X4 packages for 68 included the instruction sheets so there no new sheets for 69.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 03:08:44 AM »

I raced the car in NHRA D/MP class until about 1971. I then sold the car less engine in about 1972. The buyer installed a 358" small block and continued drag racing for a year or two. It then went to someone that stored for several years, then it disappeared. A friend of mine said he saw the car completely restored back to original at a car show about ten years ago but he didn't get the owners name. I ranm the VIN a few times but no results.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 02:43:42 AM »

Hi Jon. Good to hear from you. I miss those days, and that car.

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General Discussion / Re: Crossram Package

« on: May 18, 2018, 12:06:28 AM »

As I remember the story, someone in engineering decided that because the rear carburetor was dangerously close to the distributor, a fuel line leak and a spark would be disaster. Then, someone in the legal department decided that the shield was somewhat an admission of guilt so it was deleted. From what I understand, only a very few of the first 2X4 packages included the shield.
My original parts list that was included with the package does not show the shield.

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General Discussion / Crossram Package

« on: May 17, 2018, 11:14:35 PM »

I had one of the very first crossram packages that GM sent to a few folks. I've seen several complete NOS setups for sale over the decades but I see subtle differences between mine and the later issue units. Of course, mine had the 1st design carburetors with accl pumps on the primaries only. One thing I definitely remember is the fact that there were NO manifold cover to manifold bolts included in the package. I suppose that's why folks are debating to this day about what the correct bolt head marking was supposed to be. There isn't a correct bolt. I remember using plain cheap hardware store bolts with no marking on the head, at all. Also, the throttle return spring bracket appeared to have been dipped in near gloss black paint. Brackets in later packages were natural, unpainted.
My new 2X4 package also included the extremely rare special fuel shield that was to be installed behind the left carburetor. (image below) (eventually sold to Wayne Guinn decades later) I think only a handful of 2X4 packages included the shield. Wayne posted a picture of my shield in his book, Camaro, Untold Secrets.
The package also included the four blueprint installation instruction drawings and parts list. I made copies of those sheets many years ago and my GF was selling the copies on ebay. I think several folks have made copies of my copies and still sell on ebay. I sold what must have been the 1st design cold air plenum about 20 years ago too.
 I still have a LOT of info from GM on the crossram.