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Author Topic: Crossram and headers  (Read 11860 times)

WaltZ

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Crossram and headers
« on: August 25, 2022, 01:56:12 PM »
anyone running a crossram with headers on the street cruising with 302 and 30/30 cam.
jettting:
font carb p65s and s68s
rear carb p71s and s75s
any thoughts on this.
thanks in advance,
Walt
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BULLITT65

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Re: Crossram and headers
« Reply #1 on: August 26, 2022, 02:20:45 AM »
The 30/30 cam is not ideal for the cross ram set up, street or otherwise. I would recommend contacting Wayne Guinn through his FB group : https://www.facebook.com/groups/336597481642759
😉
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1969 garnet red Z/28 46k mile unrestored X77
-Looking for 3192477 (front) spiral shocks 3192851 (rear)
-Looking for an original LOF soft ray windshield
-Looking for original Delco side post negative battery cable part # 6297651AV

68camaroz28

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Re: Crossram and headers
« Reply #2 on: September 06, 2022, 12:05:56 PM »
Quote from: WaltZ on August 25, 2022, 01:56:12 PM
anyone running a crossram with headers on the street cruising with 302 and 30/30 cam.
jettting:
font carb p65s and s68s
rear carb p71s and s75s
any thoughts on this.
thanks in advance,
Walt
Hi Walt, we have a 69Z with Quinn certified cross-ram and carbs with repro headers BUT we have the original block stroked to 383 cu.in. and running a solid lifter roller. As previously stated normally not a good set up for the street and many things have to be done to make the set up street friendly.
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584

David K

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Re: Crossram and headers
« Reply #3 on: September 07, 2022, 12:39:32 AM »
Making that thing “street friendly “ is a task unto itself. Looks cool, sounds great, a monster in disguise.
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crossboss

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Re: Crossram and headers
« Reply #4 on: September 07, 2022, 02:54:06 PM »
Cross-Rams in general are not for the faint of heart. They are not a bolt on and go set up. Regardless of the brand, a Cross-Ram has a design with a large plenum, with long runners. Terrible for off idle (lean stumble), vacuum issues, terrible low velocity and usually the power bands are from 3,000 RPMs and up. Stroking or a larger cid engine helps. In my opinion, the best bar none Cross-Rams were the Chrysler Hemi 'Rat-Roasters' That said, Chevy and Ford made their versions for specific engines/applications. Each of those have good and bad designs. I can give you advise on what I ran (Cross-Boss, and Inline carb on a Ford 302), however that won't help here. Getting back to the subject on hand, my best suggestion is to talk to guys who run them and get your tuning advice from them on what works and what does not work.
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Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)

BRG Z28

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Re: Crossram and headers
« Reply #5 on: September 08, 2022, 12:54:20 PM »
I currently have a 1968 Z28 with a all original crossram set up. The original carburetor were redone for street use. The car is extremely drivable and street friendly. If you went for a ride in the car you would not know it had a crossram under the hood, until I put my foot into it!
The key to making a crossram set up work; revamping the carburetors, headers and a transistor ignition.

Feel free to contact me if you would like some more in-depth information.
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David K

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Re: Crossram and headers
« Reply #6 on: September 09, 2022, 02:16:15 AM »
I’d like to see some pictures of that!
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BRG Z28

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Re: Crossram and headers
« Reply #7 on: September 10, 2022, 12:23:53 AM »
Original GM crossram, cowl plenum, headers, transistor ignition and J56 4 wheel disk brake.
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BRG Z28

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Re: Crossram and headers
« Reply #8 on: September 10, 2022, 12:25:28 AM »
14,500 original miles, all original paint, factory stripe delete.
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BRG Z28

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Re: Crossram and headers
« Reply #9 on: September 10, 2022, 12:30:27 AM »
Original blip top crossram intake with 4210 carbs. The only thing on the car that is reproduction is the positive battery cable. I am looking for a original one 😁
Again, the car starts right up, idles around 1200 rpm and drives like a new car.
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crossboss

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Re: Crossram and headers
« Reply #10 on: September 10, 2022, 01:27:58 AM »
NICE!!!
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Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)

169INDY

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Re: Crossram and headers
« Reply #11 on: September 10, 2022, 02:55:29 AM »
BRGZ

Great Post, Thanks for Posting. Boy I would like to see that Car!

Plug Shields W/ Kustom Headers, I will have to see if mine Fit  (ALL repops)
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Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

Coltdogg556

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Re: Crossram and headers
« Reply #12 on: September 12, 2022, 02:54:15 PM »
I started reading this post and I was going to say talk to Paul. I know he done it on 2 different 68 Z.  But as I was reading I see he done posted his beautiful car. It's a freaking tank. I know I am  going to set mine up as close as I can like Paul's 68Z.  Then only difference is mine will be getting a full restore job (way to far gone to even think about a survivor) then I will be doing a few re-pop parts like the headers,  linkage and some other hard to find parts. Then I will NOT be running the cowl plenum air cleaner.

As Paul said, the carbs need to be worked over for the streets. I would call Jarrod Wilkom with Allstate Carburetor.  I would also talk with Wayne Guinn with Guinn Engineering about the cam.

It also depends on what Holleys you are running.  You got the 4210's they are not the best to run, but then can be worked over good for street use.  Then you got the 3 digit date code 4295, the 4295 service carbs, and the 4295 re issued carbs. I read that the re issued are the best to run but getting harder to find.

Tom Cudeyro is also a well knowledgeable person when it comes to this as well.

Wish you the best if luck. Please keep us updated on what happens with it.
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68 07C  Z28 UU, No Console,  No Tach with factory power steering. With 1968 Blip Top Cross Ram...

69Z28-RS

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Re: Crossram and headers
« Reply #13 on: September 12, 2022, 04:10:36 PM »
Replacing original Z28 intake/carb with a crossram generally means you want your Z28 (to look at).. rather than to drive...  but DRIVING a 'stockish' Z28 is so much fun! 
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09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

cook_dw

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Re: Crossram and headers
« Reply #14 on: September 12, 2022, 04:36:51 PM »
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