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Old 07-23-2013, 07:38 PM
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Upgrades suggestions and 1/4 mile estimates

So I bought a 1984 chevy C20 truck, and it has the stock BBC 454 motor and 3.73 rear gears, and pipes are cut after muffler near cab.
I was wondering basicaly what an 1980s truck with 454 like mine runs the 1/4 mile in, and yes i know it isnt exactly fast but just curious lol.

Then what it would run with long tube headers, a good intake upgrade, and holley carb, oh and bigger rocker arm ratio like 1.7 or 1.6, thanks.

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Old 07-23-2013, 07:46 PM
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Oh and is the stock output for 1984 bbc454 motors 230hp, and 400ft lbs of torque?I could'nt find any info when googling it, thanks agin
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Old 07-23-2013, 08:01 PM
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ok start here

Stock 454 motor what should I do?

Building a 700 Horsepower 454 On a Budget - Super Chevy Magazine


Chevrolet C/K - Wikipedia, the free encyclopedia
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Old 07-23-2013, 08:24 PM
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the headers are always the best upgrade.did you weigh the car? why not just race the car and find out what it can do? The the real fun starts
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Old 07-23-2013, 08:33 PM
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I was told a 1984 chevy 3/4 ton single cab 2wd weighs 5000lbs and i was thinking like 4000lbs so idk on weight, and i cant take it two hours to drive it 1/4 mile then come back 2 more hours lol, im justlooking for some good estimates with the upgrades, and in stock form.
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Old 07-23-2013, 08:59 PM
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I was actually going to add the headers last lol, so they are better then holley carb and good eddy intake?
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Old 07-23-2013, 09:09 PM
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find a chassie dyno near you. and run it!! than throw some cash at it , and dyno it again. we chop, weld , and use found part here.
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Old 07-23-2013, 09:39 PM
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Exhaust first,look at how an engine works.
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Old 07-23-2013, 10:08 PM
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a bigger exhuast isnt needed untill the current one restricts the air going out, and stock manifolds on a stock motor compared to headers wont be much different, at least thats what i have read from a few different forums and when you have good heads, intake, carb then headers are needed, correct me if im wrong but headers are said to improve performance but most ppl here they do and they hear it from ppl that upgrade their upgraded motor to headers.

EDIT: I also have dual exhuast like 2.5in i think foing to cab area then stops 6in after mufflers, and has no cats on it.

Last edited by chevyboy1986; 07-23-2013 at 10:17 PM.
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Old 07-23-2013, 10:14 PM
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Quote:
Originally Posted by killeratrod View Post
find a chassie dyno near you. and run it!! than throw some cash at it , and dyno it again. we chop, weld , and use found part here.
I dont have any dynos near me lol and it's not worth paying for it because the motor i want to upgrade is around 30 years old and a few small upgrades like intake, carb, headers, and roller rockers 1.6 ratio has been done probably 10,000 times or more and i dont have money to spend if it doesnt help much lol, but if i had the spare cash i defenitely would dyno it just for ****s and giggles.
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Old 07-23-2013, 10:25 PM
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I will correct you,you are wrong.
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Old 07-23-2013, 10:41 PM
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Old 07-23-2013, 11:40 PM
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Ok well damn I was just saying "Thats what I heard" I wasnt saying it is true, so how much do average long tube headers add to a stock motor like 10hp, and 15-20ft lbs of tq?

Or should i get short tube headers for the hp increase over long tube since the motor has tq it is just missing out in the hp range, and usually i do go for more tq though.
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Old 07-23-2013, 11:47 PM
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headers are like cams,manifolds and carbs,they flow certain amounts and scavenge certain amounts at certain RPMs based on tube diameter/length,same for collectors.
you dont put big diameter tubes on small engines or low power engines.
You need to determine the final goal of the engines output levels and match all the parts for that requirement.

generally you want longer tubes and small to moderate diameters for street engines.
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Old 07-24-2013, 12:10 AM
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Upgrades suggestions and 1/4 mile estimates

Basically anything you do to increase airflow through your engine helps. BTW a BBC already has 1.7 rocker arms. What are the head casting numbers. Pull a valve cover to see and post them. Equal length long tube headers are the best you can get for your BBC. An Edelbrock dual plane intake Part# 7161 with a Holley 850. A Howards hyd. flat tappet camshaft will help out also. HRS-120951-10. If you don't want hydraulic cam and lifters use this Howards mechanical flat tappet. HRS-127192-14. It is almost identical to the Chevy LS6 camshaft. You will need new valve springs and a set of Howards Cams 90075 billet aluminum roller rockers.
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