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Old 05-07-2005, 08:31 PM
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Looking for part number for 69 z28 cam

I was wondering if any one out there new of an optional solid lifter cam that came in the 1969 z28 that had the 302ci v-8 in it. This particular cam I am refering to--according to my source--said this cam had .513 lift on the intake and .490 on the exhaust, and that you had to use "blue" stripe springs with them or something to that effect. Does this ring a bell with anyone? If so, do you have the part number?

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Old 05-07-2005, 08:46 PM
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I believe you're referring to PN 3927140 the 1st design "Off Road Mechanical" cam. It wasn't an "option" and was never installed in a production line Z-28. It was an over the counter service item like the factory headers and dual quad cross ram set up intended for Trans Am racing.
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Old 05-08-2005, 07:42 AM
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Try this.
http://www.jegs.com/cgi-bin/ncommerc...06&prmenbr=361
JA
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Old 05-08-2005, 09:37 AM
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As above, it's probably the 140. But, Chevy didn't use huge lift cams and I doubt the 140 had those lift #s.
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Old 05-08-2005, 10:01 AM
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The part number for a factory '69 z28 solid cam is #3849346. It had 485" lift.
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Old 05-08-2005, 10:47 AM
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Thanks for the info.
After following the above link, I think I found what I was looking for.
Could I run the below listed cam with a set of ported 1.94 heads and be satisgfied with it.

270-968821
Factory ''Off-Road Special'' Camshaft
BluePrinted Mechanical Flat Tappet Camshaft
Lift: .493''/.512''
Duration @ .050'': 257/269
RPM Range: 4200-7000

| More Details $99.99
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Old 05-08-2005, 11:32 AM
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Chevy cam specs are given at 0.050" lift, that is why they do not sound too great. The 69 Z/28 off road mechanical camshaft is a very stout cam for street use.

Vince
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Old 05-08-2005, 12:36 PM
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I really liked those 302s and would go as far as to say they were my favorite all time engine that Chev made back then. I did like the ZL-1s and L-88s once the rod issues were addressed and the LS-6s and 7s were pretty *****in also but were just brute big cube motors (back then). There is alot to be said about making a stock small block run as hard and as long as those 302s did.
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Old 05-08-2005, 04:29 PM
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Quote:
Originally Posted by mouseman
Thanks for the info.
After following the above link, I think I found what I was looking for.
Could I run the below listed cam with a set of ported 1.94 heads and be satisgfied with it.

270-968821
Factory ''Off-Road Special'' Camshaft
BluePrinted Mechanical Flat Tappet Camshaft
Lift: .493''/.512''
Duration @ .050'': 257/269
RPM Range: 4200-7000

| More Details $99.99
Yes, you can run it, you'll need about 12.0:1 compression, a set of 4.56s and a stick or a huge stall with an automatic. You'll have to twist the guts out of it.

Put some braces on the fenders, cause it's gonna shake them.
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Old 07-24-2009, 01:02 PM
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Chevy Off-road Cam

Hey Mouseman,

I ran this cam in a .030 over 327 small journal with 11.5:1 and 1.94/1.60 heads. Used the 69 Z/28 dual plane high rize with Holley 4780. Very stout cam that came on around 3,000 RPM and would make power to my redline (6,500).
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Old 08-13-2010, 02:23 PM
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Azho

I 2 Would Like 2 Have The Part Number For The
Z28 Off Road Cam Shaft
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Old 08-13-2010, 03:29 PM
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This brings up a question: the 69 z28 had a 302 with an 800cfm holley or cross ram intake with two 600 cfm holleys. I have heard that these cars lacked low end power and the cross ram had even less than the single carb. A single 800 cfm seems like too much already but then they offered twin 600's which equals 1200 cfm. Does anyone else think that this engine would have been better off with a smaller carb?
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Old 08-13-2010, 04:00 PM
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Quote:
Originally Posted by bigdog7373
This brings up a question: the 69 z28 had a 302 with an 800cfm holley or cross ram intake with two 600 cfm holleys. I have heard that these cars lacked low end power and the cross ram had even less than the single carb. A single 800 cfm seems like too much already but then they offered twin 600's which equals 1200 cfm. Does anyone else think that this engine would have been better off with a smaller carb?
It was carbed big from the factory due to racing organization rules of having to use the same carb # used on a street engine. The track cars needed a large carb to get the job done, so the production models offered to the public had to have a technically too large carb in order for the the guys racing it to have enough carb, Chevy really didn't care how driveable it was, it was a package offered just so it would be legal for them to race it in Trans Am competition and win. Same reason headers and crossram were offered as over the counter option parts with GM part #'s assigned to them, so that they would technically be legal. the Trans Am race series 5.0 liter limit(305 cubes ) is the only reason the 302 even existed. Had it not been for that rules size restriction, chevy never would have bothered to make a 302, as it wasn't a good street package compared to a 327 0r 350. It was already outgrown at the time it was released.
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Old 08-13-2010, 04:14 PM
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Has anyone here tried a smaller carb on the 302? How was the performance? I'm just curious to see if the smaller carb would solve the problem with low end power.
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Old 08-13-2010, 05:36 PM
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Quote:
Originally Posted by bigdog7373
Has anyone here tried a smaller carb on the 302? How was the performance? I'm just curious to see if the smaller carb would solve the problem with low end power.
Not really, it is a short stroke engine, it isn't going to have much low end power...just like a 283. A cam change to something smaller in duration would help more.

So would swapping to a 350/383
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