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Discussion Starter · #1 ·
Engine: 1990 305, 906 vortecs, factory roller cam, Q-jet carb, Factory exhaust, daily driver. Vehicle: 1980 B-body (caprice), 200 4r, 3.08 gears, 215/70R15 tires.

My intake choices were between edebrock, professional products, or GM performance. I searched this same question and no one had anything good to say about the professional product intake. Eveyone was saying they are cheap chinese junk so I eliminated that one right away. I couldn't find any coments on the GM performance vs the edelbrock. I have seen some people talk about the exhaust crossover (which my vortec heads do not have) for cold weather starting. I don't know how important the crossover is but I don't mind if I have to let it warm up for a few minutes in the winter. Winters can get pretty cold in New England, the coldest I have seen was -10 for a few days. Anyways just wanted to know if anyone is familiar with the GM performance manifolds, it's about $140 more than the edelbrock but if it's a better manifold I don't mind paying for quality.

These are the links to both manifolds.

http://www.summitracing.com/parts/EDL-2116/

http://www.summitracing.com/parts/NAL-12496820/
 

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Hates: Liver. Loves: Diesel
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I don't mean to offend, but a stock 305 cam is miniscule and you dramatically lowered the already low compression with the 350 heads. You might be in the low 7's with compression.

You could probably stuff drinking straws in the intake ports and never run out of breath.

The GM intake came installed on millions of ZZ4 crate engines and probably half of those buyers took it off for something else. I bought mine as a new take-off for $40 plus $10 shipping on Ebay.
 

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There's a ZZ4 intake on ebay right now for $104........but there's hundreds of Edelbrocks. None of them will be worth a chit with 7 to 1 compression and 3.08 gears........better re-think a few things.
 

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Discussion Starter · #6 ·
or maybe instead of putting all this time and effort into a 305 that im starting to understand why people hate so much I should just take my 350 one piece rear main .040 over block and build that. It has been acid cleaned (or whatever it's called) just needs to be honed and get a rebuild kit. Seems like everytime I take one step forward I take two steps back, I'll learn someday.
 

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Caprice Sleeper said:
or maybe instead of putting all this time and effort into a 305 that im starting to understand why people hate so much I should just take my 350 one piece rear main .040 over block and build that.
The 305 is a GREAT stock engine, but you understand why its not a good start for performance. I wish other 305 folks understood :)
 

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Discussion Starter · #8 ·
I never thought my 305 was going to be a performance engine, It was going to be just a step up from my V6 that I have now. I just wanted to get a little extra power out of the 305 with a set of vortec heads. I thought with the improved heads it would be more efficent and reliable until I build my 350 and then ill have a real sleeper.
 
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