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110433 Posts in 12758 Topics by 4891 Members
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2536  Model Specific Discussions / Trans-Am Camaros / Crossram manifold on: October 03, 2011, 01:37:53 PM
Many thanks go out to Tom McIntyre for sending me these photos of his early prototype cross ram manifold so we can all enjoy them.
Wayne Guinn's book Camaro: Untold Secrets is a great resource for learning more about these manifolds.

Here's a shot of Tom's manifold as seen from above. The rear of the manifold is to the right.

A view of the manifold as seen from the rear. The hex-head brass plug is not original.

A view of the manifold as seen from the front. The gasket between the lid and base is much thicker than original.

A look down through one of the carburetor openings.

This view shows the lid removed and flipped upside down.

Handmade fuel distribution fixes are seen here at the inside/front of the manifold by intake runners #1 and #3.

Another fuel distribution fix, this one to the rear of the #4 intake runner.

A look at the bottom side of the manifold showing a heat shield riveted in place.

Another look at the heat shield. These heat shields were only used on the prototypes and then
discontinued on the production manifolds. They weren't found to be necessary.

Some material has been added to raise the height of the port and some grinding is evident to clean up that area, as well as to to match up with the cylinder
head ports. Also of note are the oval shaped holes for the intake mounting bolts which probably were necessitated by a decked block and/or milled heads.

Another look at the bottom of the manifold, this time as seen from the front. The shape of the front of the prototype manifolds
around the waterneck area is different than the production units.

Same thing but this time from the rear. The casting date and part number are under this shield, which has never been disturbed.
Another prototype base which has had its shield removed showed a casting number of 0-310510.

The casting numbers on the lid of this manifold. Casting number for this piece is 0-310512.

Closer view and different angle. Casting date which looked like 12-8-67 above appears like it might be 12-3-67.

Someone has put a freeze plug in the hole for the oil filler tube. The Winters Foundry mark
to the right is slightly larger and raised higher than on the production cross ram manifold.
2537  Model Specific Discussions / Trans-Am Camaros / Re: 1969 Wolverine Trans-Am photos on: October 02, 2011, 11:32:57 PM
Here are the Jim Paschal Javelin photos from klvn8r. The Nascar GT cars are built in a style very similar to a Nascar Grand National
car of that era and are built to take the pounding of a high speed oval and also some of the dirt and asphalt short tracks on the
schedule. The first picture is from the '69 season and the last photo is from 1970. The engine photos may be from 1970 since
klvn8r tells me they are the heads with the dog-leg ports and those heads came out on the '70 AMC cars.

2538  Camaro Research Group Discussion / General Discussion / Re: crossram questions on: October 02, 2011, 10:11:06 AM
I understand the visual appeal of the cross ram although, as mentioned by others, they are not nearly the rare and unusual sight that they used to be. You almost expect to see one under the hood of every Z you see now and of course the hood is probably the cowl induction style (yawn). What is really silly to me is seeing a cross ram on an engine with exhaust manifolds and a complete AIR system.
2539  Model Specific Discussions / Trans-Am Camaros / Re: Dyno sheets from the era on: October 02, 2011, 01:05:53 AM
This test shows how setting the valve lash a little differently on this experimental camshaft affects torque and horsepower.

2540  Model Specific Discussions / Trans-Am Camaros / Re: Firebird and the Trans-Am series on: October 02, 2011, 12:57:20 AM
Craig Fisher's Firebird at Riverside, October 1968.

Petersen Publishing photo

Petersen Publishing photo

Petersen Publishing photo

Petersen Publishing photo

Petersen Publishing photo
2541  Model Specific Discussions / Trans-Am Camaros / Re: Original T/A racing photographs, late 60's & early 70's on: October 02, 2011, 12:53:58 AM
June 1967 Mid-Ohio Trans-Am. George Follmer, standing in the driving suit with Firestone across
the back, is substituting for Mark Donohue who is driving at LeMans for the Ford team. Roger Penske
is crouched on the other side (red shirt) discussing the rear brakes with a crew member.

Jon Mello Collection
2542  Model Specific Discussions / Trans-Am Camaros / Re: 1969 Mid-Ohio Trans-Am photos on: October 02, 2011, 12:30:05 AM
Three more photos from this race which did not get posted earlier.

Russ Norburn (#17) and Bert Everett (#14) going under the bridge at turn 1.

Photo by Ron Lathrop

Mark Donohue's Camaro and Ted Roberts' Javelin.

Photo by Ron Lathrop

The Don Yenko and Rusty Jowett Camaros.

Photo by Ron Lathrop
2543  Model Specific Discussions / Trans-Am Camaros / Re: Original T/A racing photographs, late 60's & early 70's on: October 01, 2011, 12:09:22 PM
Mark Donohue in the #15 car at the '68 Sebring Trans-Am.

2544  Model Specific Discussions / Trans-Am Camaros / Re: Dyno sheets from the era on: October 01, 2011, 12:02:02 PM
Here's a dyno test from Febuary 3, 1967. Another test of a 302 with the 0-302190 experimental camshaft.
It looks like milling the heads to increase compression, blocking the heat crossover passage, changing the
valve springs, and porting the heads and intake increased both horsepower and torque.

2545  Model Specific Discussions / Trans-Am Camaros / Re: "Inside the Cars of the Trans-Am" and other articles on: October 01, 2011, 11:38:36 AM
From the April 1968 issue of "Sports Car", the national publication of the SCCA.

2546  Model Specific Discussions / Trans-Am Camaros / Dyno sheets from the era on: October 01, 2011, 01:15:56 AM
Here is a dyno test run by former GM engineer and Trans-Am racer Jerry Thompson back on 2-13-67. It was a test of two experimental
camshafts in a 302 engine. The first cam, p/n 0-261898, had .495" lift on the intake and .465" on the exhaust. The second cam, p/n
0-302190, also has .495" lift on the intake but a slightly higher lift of .475" on the exhaust. Unfortunately, we don't have any of the
other cam specs but these seem to be in the vicinity of what became known as the first "off-road" camshaft, released to the public in
1968 as p/n 3927140. Interestingly, the first cam with the slightly lower exhaust valve lift yields modestly higher torque and horsepower
readings. The chart paper does not show readings beyond 6,850 rpm and, as such, the second cam may close the gap and/or surpass the
other in the 7,000-7,2000 rpm range.

2547  Model Specific Discussions / Trans-Am Camaros / Re: Old Bits That Still Work - Chevy 12-Bolt Rear End on: October 01, 2011, 12:52:58 AM
Thanks, Chad. I appreciate you sharing your thoughts. For racers who think the 12-bolt is not a strong enough piece to race with, that is a fallacy. The Ford 9" is a very strong unit and does allow easier gear changes however, I don't believe there are vintage racing guys changing ratios from one race to another. Also, I hear the Ford 9" has slightly more parasitic horsepower loss than than a 12-bolt.

There is precedence for guys running Ford 9" rear axles in Camaros and there is even one that I know of that used a Chrysler 8-3/4" rear axle. That is because of a rule change for the 1970 season that allowed racers to use rear axles from rival manufacturers. Why the SCCA felt they needed to make this change, I don't know, but they did. With that being said, nothing but a 12-bolt rear axle was used in a Camaro in the 1967-1969 years and that includes the Penske cars. Also, the vast majority of Camaros running in Trans-Am up through the "classic era" cut-off year of 1972 continued to utilize the GM 12-bolt.
2548  Model Specific Discussions / Trans-Am Camaros / Re: Trans Am racing pace car pics...are there any? on: October 01, 2011, 12:37:30 AM
Glad to hear you are finding some things to help you out. Here is a shot of the '68 Daytona 24hr pace car (SS396) with actor James Garner driving and Nascar boss Bill France in the passenger seat. In 1968, the Daytona 24hr race was part of the Trans-Am race schedule. The upper body color is red, if I remember correctly, and the car does have a rear spoiler (although it is cut off in this photo). This car still exists.

2549  Model Specific Discussions / Trans-Am Camaros / Re: TRACO Chrome Small Block Chevy Valve Cover Pictures on: September 29, 2011, 09:32:26 PM
Mr. "Sixteen Grand Sedan #56" pointed out an ebay auction to me for an NOS painted version of these valve covers. The great part is it has a part number for us to reference.

The GM parts book indicated it is for...
64-66 Chevelle 327 (exc Special High Performance) Left or Right
65-66 Nova 327 (exc Special High Performance) Left or Right

2550  Model Specific Discussions / Trans-Am Camaros / Re: Old Bits That Still Work - Muncie Transmissions on: September 28, 2011, 11:16:59 PM
Don't worry, Chad. I wasn't going to beat you up too bad over that.  Grin

I do agree that the Muncie is a great choice in a vintage race car. You are not the only Camaro guy opting to run one but there are others who, for whatever reason, choose not to. There are many Camaros running Ford 9" rear ends and also guys who are successfully running with a 12-bolt (including yourself). Let me hear your thoughts on the 12-bolt when you have an opportunity. I really did not enjoy seeing the '69 Penske car with a 9" under it. It does not suit the history of the car.
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