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  #16 (permalink)  
Old 12-16-2013, 04:23 AM
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if i use stock manifolds [dormans] vs headers would i loose hp? i like the looks of dormans manifolds. thanks

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  #17 (permalink)  
Old 12-16-2013, 04:27 AM
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Quote:
Originally Posted by tn chevy View Post
if i use stock manifolds [dormans] vs headers would i loose hp? i like the looks of dormans manifolds. thanks
if you have the truck ram horns.. use them..
yes you'll loose a little.. but the ram horns don't give up much , nothing like log type
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Old 12-16-2013, 11:29 AM
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would stock manifolds take horsepower away? (dorman).? does headers give that much more hp? thanks
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Old 12-16-2013, 12:17 PM
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dorman's are aftermarket parts.. replacements.. made in china

in a post earlier you said this is for a 71 c-10..
the original ones are called RAM HORNS
and look like this
http://i.ebayimg.com/t/NEW-Ram-Horn-...dt3w~~60_3.JPG

yes you will loose some power with these over CORRECT sized and tuned headers.. something most don't end up with..
you'll not give up much until 5000rpm..

this is a log type manifold
http://monsterautoparts.com/PONTIAC/...%2086%2087.jpg

that will kill power all over the place..

for a street truck that spends very little time at or above 5000rpm.. ram horns are fine..
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Old 12-16-2013, 03:33 PM
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Dorman also sells replacement 2 1/2" outlet rams horn manifolds from the mid sixties Corvette. If the down pipe fitting position (pointing just about straight down) will work with your vehicle, they are about the best flowing OEM manifolds you could use. They used to run about $70/manifold but I have not checked prices lately.

Bruce
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  #21 (permalink)  
Old 12-16-2013, 10:31 PM
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a low horse 350 with ram horns and a heavy truck will be far from a spirited drive.I think you are turning more towards fuel economy now? Thats good in todays times,,,,
there is a current thread about building an economy engine,read through it
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Old 12-17-2013, 06:50 AM
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a low horse 350 with ram horns and a heavy truck will be far from a spirited drive.I think you are turning more towards fuel economy now? Thats good in todays times,,,,
there is a current thread about building an economy engine,read through it
his truck is most likely lighter than your f body.. or at least lighter than any 2nd gen f body started out at..

my 71 c-10 a/c 2wd long bed all iron 305(at time of scale at dragway) th350 12 bolt, 8"front and 12" steel wheels.. 3968 with 1/4 tank of fuel..and my fat butt out of it..
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Old 12-17-2013, 07:03 AM
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Thanks GHL for backing my post.4000 pounds is almost a dump truck,,, 16-20 pounds per rwhp empty,,,, the F-body I had weighed 3915 first time to the track,ran high 13s for the previous owner,took me two seasons to drop into the 11s with a 454.
a 350 in a pick up will likely go 17s or 18s. go for the mileage
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Old 12-17-2013, 07:24 AM
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Just make it a cool cruiser. A little thump, and a powerband from 1500-5000. Fun to drive often and reliable. If you get headers, no reason to buy cheap "shorty" headers; spend the bucks and get a good set of proper size and length Hookers, Hedmans, etc.
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Old 12-18-2013, 08:32 PM
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has anyone used one of the hei ignitions from jegs? there brand?
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Old 12-18-2013, 08:53 PM
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Quote:
Originally Posted by jokerZ71 View Post
The warranty should apply on any 69 to 85 GM vehicle that woulda came with a 350 engine I would think......Never mind,Jeg's says 73 to 85. SD says 69 to 85.I guess it depends on who you buy from.
The key here is "that woulda come with a 350.

I installed one in my 85 El Camino and was advised by the dealer it was sold with out warranty because all the 85's came with 305's not 350's.

It must be used to be a direct replacement for a like 350.

John
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Old 12-19-2013, 07:59 AM
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RE: Jegs HEI. No, but my best friend has a Pro Comp. Its pretty chintzy, but it works okay for a street car. Pull a GM HEI from the junkyard and rebuild it. We can walk you through it.
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