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The Terminator
Exhaust
JBA Shorty headers vs. Long tube headers
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<blockquote data-quote="SlowSVT" data-source="post: 8232452" data-attributes="member: 20202"><p>What is your definition of “doing it right”? With headers it often means you "doing it more them once" with all the problems they create :cuss:</p><p></p><p>LT’s don’t exactly yield big results in there cars either if power gain is your ultimate goal and also come with a few penalties of their own. I admit shorties won’t buy you much horsepower gains but they do have advantages over both the stock cast iron manifold and long tubes as outline on my earlier post. The first is reduced pumping losses in the engine over the very restrictive stock manifold which is probably responsible for the hp gains but won’t scavenge the exhaust like LT’s will. I don’t see what the point is porting the exhaust runners when they are dumping into that cast iron manifold. They will also allow for more options with different systems design to work with the stock exhaust systems as I pointed out plus you will loose a couple pounds of weight in the process. Long tubes can be nothing more then a pain in the ass especially working around all those tubes trying to tighten the header bolt on a leaky exhaust.</p><p></p><p>The back pressure created by stock exhaust maintains higher boost pressure by restricting the charge ability from getting sucked out the exhaust system from the negative pressure created behind the high pressure wave during cam overlap which is largely responsible for a few pounds of lost boost. On an NA engine headers will help the engine scavenge the spent gasses out while on an FI engine the boost can do that..</p><p></p><p>For me when you add up all the advantages and disadvantages between cast iron, shorties and LT’s, the shorties are the best choice for a street car with some of it having nothing to do with horsepower. On a big 600+ hp engine the LT’s will start to make more sense but you will still have to deal with the service and clearance issues.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 8232452, member: 20202"] What is your definition of “doing it right”? With headers it often means you "doing it more them once" with all the problems they create :cuss: LT’s don’t exactly yield big results in there cars either if power gain is your ultimate goal and also come with a few penalties of their own. I admit shorties won’t buy you much horsepower gains but they do have advantages over both the stock cast iron manifold and long tubes as outline on my earlier post. The first is reduced pumping losses in the engine over the very restrictive stock manifold which is probably responsible for the hp gains but won’t scavenge the exhaust like LT’s will. I don’t see what the point is porting the exhaust runners when they are dumping into that cast iron manifold. They will also allow for more options with different systems design to work with the stock exhaust systems as I pointed out plus you will loose a couple pounds of weight in the process. Long tubes can be nothing more then a pain in the ass especially working around all those tubes trying to tighten the header bolt on a leaky exhaust. The back pressure created by stock exhaust maintains higher boost pressure by restricting the charge ability from getting sucked out the exhaust system from the negative pressure created behind the high pressure wave during cam overlap which is largely responsible for a few pounds of lost boost. On an NA engine headers will help the engine scavenge the spent gasses out while on an FI engine the boost can do that.. For me when you add up all the advantages and disadvantages between cast iron, shorties and LT’s, the shorties are the best choice for a street car with some of it having nothing to do with horsepower. On a big 600+ hp engine the LT’s will start to make more sense but you will still have to deal with the service and clearance issues. [/QUOTE]
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JBA Shorty headers vs. Long tube headers
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