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Old 04-23-2010, 12:47 PM
Jevrolet
 
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Edelbrock Power Package

I have a 74 400 CID and am planning to rebuild the top end as the stock heads are smoggers and suck. Not planning on doing anything to the bottom end (mistake?). I was wondering what ya'll think about edelbrocks top end packages. Looking for about 350 HP with some good torque to be used predominantly on the street but also off road.


http://www.edelbrock.com/automotive_...age_main.shtml

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Old 04-23-2010, 01:12 PM
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from what ive heard, edelbrock performance top end packages are a good scorce of horsepower and torque, also they are cost effective. id go with it if your not planning on using it for the track.
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Old 04-23-2010, 05:53 PM
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Check out the "Trick Flow" heads good prices and a few Xtra innovations.
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Old 04-24-2010, 12:36 PM
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You're asking if its a mistake to not rebuild the bottom end? How many miles on the engine? is it stock with cast pistons? or has it been rebuilt with good stuff?
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Old 04-24-2010, 12:39 PM
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for the price edelbrock is a great bargain... also anything is better than the stock setup. If you're looking for easy and cheap edelbrock is def the best choice.
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Old 04-26-2010, 08:41 PM
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yeah, I'm not sure what has been done to this engine. The guy I got it off of didn't know much about it, was selling it in a jeep that his grandad had built. The intake manifold was a Weiand but it was kinda chewed up and wouldn't take a gasket so I replaced it with an Edelbrock. I came across the bolt on packages when I was shopping for that. Just judging by the way it "feels" I'd say there hasn't been much else put into it so I was thinking some new heads/cam/and whatever else they put together for you would wake it up a bit. As far as how many miles... well the guy I got it off of said it has had 10k since the last rebuild, but again, that's about all he knew about it. I guess I don't have a reason not to trust him. Except for the leaking gasket (which is now fixed) she seems to run just fine.
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Old 04-26-2010, 09:56 PM
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Those early/mid 70's motors were assembled with quite a tall piston deck height (piston crown to block deck), so by the time you bolt in a conventional thickness gasket, there is no squish to speak of. That and the fact that Chevy used a crummy dished piston with no squish pad or even squish ring on it makes the bottom end junk from a performance standpoint. I predict that once you bolt on some new heads and such and really get some cylinder filling going on, you're gonna find the motor in detonation. I certainly don't know all the answers, I'm just quoting from experience because I lived through those years and was building motors back then.

In my opinion, the only way to build any SBC properly is to set the squish 0.035" to 0.045" and use a piston with a flat area to mate up with the underside of the head. This thumbnail will show an example of a piston with little or no provision for squish provided by the very thin flat surface at the crown.....
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Old 04-27-2010, 08:18 AM
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hmm, this is true. I suppose that I'm just going to do a complete take down of it and find out what's there.
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Old 04-27-2010, 08:42 AM
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Quote:
Originally Posted by seandiddy
hmm, this is true. I suppose that I'm just going to do a complete take down of it and find out what's there.
Trust me,you will be much happier knowing what is it rather that an unhappy incident later down the road
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