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GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
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"H" or "X" Pipe On A V6?
Most any half decent engine builder out there can tell you about the benefits of an "X" or even and "H" pipe in the exhaust system as it is pretty well known that they "balance" exhaust pules and can even increase scavenging if designed properly. In my mind, they are a no brainer on pretty much any application utilizing dual exhaust manifolds and pipe.
But then there is the Big GMC V6 family with their unique firing order where it is perfectly staggered from one side to the other unlike most all (if not all) other "V" engines that have one cylinder firing right after another on the same side. With this being the case, in my mind, there is no exhaust pulse "imbalance". If this is the case, there is no benefit to an "H" pipe as they really only balance the exhaust without increasing scavenging. If I am still on the right track, then the question begs, "does an 'X' pipe provide any benefit?" It doesn't provide any gains from balancing the exhaust, but could it still increase scavenging? |
#2
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Re: "H" or "X" Pipe On A V6?
I just hope that's not on the top of your list of things to do.
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#3
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Re: "H" or "X" Pipe On A V6?
Not on the top, but it is on the list - along with head porting, cam grinding, building headers, offset grinding the crank, custom pistons, BB Mopar rods, balancing, etc.
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#4
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Re: "H" or "X" Pipe On A V6?
Not sure about any increases or decreases but I've thought about that here and there....personally been happy with the true duals thus far.
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"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#5
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Re: "H" or "X" Pipe On A V6?
The 478 cid V-6 in the single axle tractor Dad drove to the Peoria Stock yards one night 50 years ago seemed to do real good with just dual exhausts, no X-pipe. Old girl rattled the windows at 2 AM really good loaded. It was Dad's second trip there that day, I was supposed to keep him awake.
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#6
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Re: "H" or "X" Pipe On A V6?
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#7
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Re: "H" or "X" Pipe On A V6?
Your question of installing an H or Y pipe is a great addition to the V6 no matter what other people say on the benefits or the cost. On my 1965 suburbun with a 351M which has the spec cam (Pete's) that is talked about on here, "H" pipe directly behind the PG followed by 2 1/4" pipes and Magaflows all dumped straight out the back of the bumper sounds great. By mixing both banks of cylinders the sound is unique - so much so that most people have no clue what is under the hood - most will not believe it's a V6 - somewhere my truck was even filmed and sound recorded on Face Book - what a surprise to me. I say "install the pipes! "
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#8
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Re: "H" or "X" Pipe On A V6?
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5 or 10 hp added to the 205 or 235 net hp of the 478 or 125 hp of the 305 "Might" be noticeable. True story, Buddy and I driving identical tractors, 320 net hp, first loads one day I was 400# heavier than his 70,000#. He walked away from me every 10 miles or so for 175 miles. Coming home I was lighter by 250-300#, I walked away from him 5-6 times in the 175 miles, maybe could have done more but I wasn't trying too hard. I think lightening the truck by a couple hundred pounds would make more difference than the hp. Added hp usually costs burning more gas, lighter weight saves hp and gas. I really think it's more than just a coincidence that a Chevy, GMC, Ford, and IH with big gas V-8 power had almost identical exhaust design. |
#9
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Re: "H" or "X" Pipe On A V6?
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#10
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Re: "H" or "X" Pipe On A V6?
[QUOTE=POWERSTROKE;69517]Whether it was a lowly little LoadStar with a 345 cid V-8, or a FleetStar with 478 V8, or a C65 with 366 V-8, or C70 with 427, anywhere from early/mid 1960's to late 1970's, they all had true dual exhausts.
Powerstroke, you failed to mention the bigger GMC truck Powered by the bigger displacement V6 engines that also came equipped with dual exhaust? late 60's up to 1974 on H & J Series 7500-8500 trucks equipped with 401M. 432,& 478M engines. Also the 73-74 C6500 series equipped with 379 and 432 engines, the same should apply for T series tilt cabs of that era. |
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