1st design off road cam #3927140 Vacuum Issue?

[cdn454LS6]

Hi Everyone
Rebuilding my stock 302 with all the original parts, pink rods, 1178 crank, 0 rockers, 11-1 stock pistons, single DZ carb etc etc.
Can I use the 1st design off road cam #3927140 in this stock engine for street use with 410 rear.
Can I still use pump gas 94 And is it possible to have a vacuum problem at all?
Thanks very much in advance for your help.
Ken

[beater68427]

My JL8 has that same cam seems to work fine I actually like the bleed with the overlap seems to be a bit of a ease with the comp ht. with pump gas, no ping brakes work great!!

http://i226.photobucket.com/albums/dd132/1972cutlass/my69z.jpg

[Bill Pritchard]

In the mid 70's I built an LT1 with that cam and had it in a 69 Camaro with power disc brakes. Had no lack of vacuum for the brakes, so you should be fine.

[Andy]

A guy on camaros.net just put one in his car along with headers and he loves it. It really sounds strong in his video. I think he has a gardeners chambered exhaust too.

http://www.youtube.com/watch?v=WTgT0VCytGc

http://www.youtube.com/watch?v=iXK-lTkRXBY

[Salvatore]

4:10's may be a little tough to pull out with the car. Unless the trans was a M20 box. I would go to 4:56's with an M20 box and that car would be mean. Also I like pressed in wrist pins. A little safer and it doesn't have much, if anything to do with performance. 302's are all about proper gearing. We already know how much they rev! http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif

[Steven J]

My brother had a stock, except for the off road cam, 70 1/2 Z-28. 4 speed, 4.10 gear. It was fine with power brakes, had a great sounding idle, but 4.56 gears would have been better with that cam.

[Bill Pritchard]

I agree, a steeper gear would be better...I had 4.88's in my 69 Camaro.

[Salvatore]

Now we are talking. On a sb chevy most people play under the hood instead of playing under the back end! http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif

[70 ls6 convert]

Thats the cam i put in my 302 back in 1990,its been foulen plugs ever sence,turns out that was a good thing because i never drove it.just wondering if the primary jets is the cause of the engine running so ritch..

[1967Z28]

I ran that cam in my 302 for a number of years and loved it. Never had a detonation problem using pump gas premium but it did tend to foul plugs. I drove this car as a daily driver and would change plugs about every 1000-2000 miles. No vacuum problems at all. My engine was stock other than headers and the cam, and I was running 4.10 gears. I think 4.10 gears were great with that engine. Best to run 302s with a 4-series gear. I don't think you should run the 140 cam without headers. Chevrolet certainly did not recommend it back in the day. Is that what you are considering?

-Jon

[Salvatore]

If you were going to change your stock 302 cam out of your Z at this point would you replace it with a better, higher lift/duration after market unit or something like an NOS 140 cam? Which would be faster and better suited. Do you think maybe Comp Cams makes a better all around suited performance cam than the 40 year old Chevy design? Thanks, Sam

[SSRSBOB]

Have seen reports on this G. Sommer's Z28. Car appears to be very fast and set up by McNeish, runs in the mid 13's with street tires and closed exhaust?