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Old 07-06-2010, 01:50 PM
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Question about secondaries on Holley ?

Hey guys, I have a 67 el camino with a mild built 350, comp 270 magnum, rhs vortec heads, headers, turbo 350 trans with 4.10 gears, etc. I have a Holley street avenger 670 carb with vacuum secondaries. My question is, should I keep the stock vacuum secondary spring, or switch to the lighter one, or the heaver one? The instructions say to run the light spring with a light vehicle. My el camino weights 3200lbs. Is this considered a light or heavy vehicle? Any thoughts?

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Old 07-06-2010, 02:08 PM
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The best way to determine that is to try it.
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Old 07-06-2010, 02:18 PM
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BTW...I think an el Camino is more in the 3600-3800 pound range.

edit.....Looked it up....You are closer at 3200 than I am.......didn't think they were that light.......
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Old 07-06-2010, 02:32 PM
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Quote:
Originally Posted by poncho62
BTW...I think an el Camino is more in the 3600-3800 pound range.

edit.....Looked it up....You are closer at 3200 than I am.......didn't think they were that light.......
Friend of mine had a '66 El Camino with a Pontiac 400 and TH400. He used it to tow his '65 GTO drag car but ran it a few times as well and IIRC it tipped the scales at about 3600. With a serious diet 3200 is possible.

Any vehicle I ever owned always seemed to weigh at least 3 to 400 pounds more than what everybody else claimed their's did. Maybe I had too much air in my spare tire.
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Old 07-06-2010, 02:41 PM
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Me too...never had a 66, but had 68 el Camino and 70 SS Chevelle.....both weighed in at least 3700....but were big blocks.
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Old 07-06-2010, 03:11 PM
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Usually the spring that gives the best performance overall is the silver/plain steel, purple or long yellow spring. Seat of the pants driving impression can be very deceiving. You have to go to the drag strip and test.
Sometimes the light spring feels faster but you are actually feeling the secondaries crashing in.

The last time I messed with my 750 vac sec carb at the track the car posted the best ET and MPH using the silver/plain steel spring.

If your carb has a stiff black or brown spring, and you go to a lighter spring, increased sec jet size may be required.
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Old 07-06-2010, 03:27 PM
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Wow, thanks for the replies guys. I don't know for sure if the el camino is 3200lbs, I believe I read it somewhere a while back. 3200lbs seems a little light to me, I thought it would be more around 3500lbs. So I'm still confused, (It doesn't take much, lol), Should I stay with the lighter spring or go back to the stock, or the heavier black one?
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Old 07-06-2010, 03:33 PM
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With your setup I'd sure give the lighter spring a try.
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