Factory manifolds.....just how good were they?

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66fs said:
Why would they test anything that would not sell their product. Would you buy a Performer, Torker or whatever for your 340 or 360 that would lose you 15-20 HP or make the same HP? Sorry, I'm a bit cynical... Figures don't lie, but liars can figure. Look at what people were running in "Stock Class" years ago, when everything had to be stock and unported. Why do you think 340's and 360's were factored so heavily?
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hi, thank you, very true. they are factored heavily. a case in point, the 240/340 factored at 285 /299 hp. the 275 /327 factored at 274. they run same class!!!
 
dukeboy_318 said:
It's all in relation to the overall combo.

Slap a base model, out of the box Performer on an otherwise stock engine and you might gain 10-20 hp, take that same intake and do a cam swap to match the power band, you might gain 75.

The performer intake was designed to be a slight upgrade to a stock, key word slight. No when you start getting into Airgaps, Holley street doms and others, that's where you'll start seeing more difference, especially if the combo all matches each other.


I will agree that mopar factory intakes weren't too shabby in their days, neither was that big TQ, by pass all the emissions stuff and you had you an 880 cfm carb with massive secondaries
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A std performer intake would probally be a DOWNGRADE compared to a 71 or 72 intake.
 
Other than weight, sounds like the original '72 TQ intake would be a strong runner on a street machine.
 
hi, mopar did their homework back then, concerning intake manifolds. in early days of super stock, there wasn't a aluminum manifold that worked with a340, ed hamburger , modified a stock cast intake for his super stock 340. it out performed any aluminum intake at the time. then offy came out with a manifold that worked, you had to glue pop sickle sticks in floor to get correct fuel mixtures to each port. now they went faster!!! the stock cast iron intakes on 340's are a very good intake, street or race use!!!
 
perfacar said:
hi, mopar did their homework back then, concerning intake manifolds. in early days of super stock, there wasn't a aluminum manifold that worked with a340, ed hamburger , modified a stock cast intake for his super stock 340. it out performed any aluminum intake at the time. then offy came out with a manifold that worked, you had to glue pop sickle sticks in floor to get correct fuel mixtures to each port. now they went faster!!! the stock cast iron intakes on 340's are a very good intake, street or race use!!!
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How would you rate them up against an aluminum spread-bore dual plane like the Weiand Action+Plus?
 
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