460 Engine Rebuild
Posting Guru
Joined: Jan 2006
Posts: 1,101
Likes: 2
From: Malvern, Ohio
Yes, they are turbocharged, but they are less than 1/2 the engine of a V-8 460, but your point is well taken.
The links that I listed go into way more detail than I care to here, especially the exhaust theory link, which covers the real culprit mistakenly referred to as "backpressure" ( which does not exist), when it talks about waves. You will also notice that it says bigger is better is absolutely wrong, but then see what size pipes are recommended.
What I really liked about that article is the reference to the exhaust system as being a 5TH stroke on a 4 stroke motor.
I'm more of a small-block stroker guy, but when I searched 460 headers at Summit, every one I looked at had 3" collectors, including the ones with only 1 5/8" primaries, yet another clue that 3" pipes are they way to go.
I was basing my original recommendation on the fact that in my research, 2 3/4" pipes are none too small, and 3" would be an option on the slightly less than 400 ci. 351W stroker I'm building.
The links that I listed go into way more detail than I care to here, especially the exhaust theory link, which covers the real culprit mistakenly referred to as "backpressure" ( which does not exist), when it talks about waves. You will also notice that it says bigger is better is absolutely wrong, but then see what size pipes are recommended.
What I really liked about that article is the reference to the exhaust system as being a 5TH stroke on a 4 stroke motor.
I'm more of a small-block stroker guy, but when I searched 460 headers at Summit, every one I looked at had 3" collectors, including the ones with only 1 5/8" primaries, yet another clue that 3" pipes are they way to go.
I was basing my original recommendation on the fact that in my research, 2 3/4" pipes are none too small, and 3" would be an option on the slightly less than 400 ci. 351W stroker I'm building.
Posting Guru
Joined: Jan 2006
Posts: 1,101
Likes: 2
From: Malvern, Ohio
Ok guys, I've done a search & I can only find 2 exhaust for my truck. One is from Summit which is a 3" exhaust & the part number SUM-684012, I don't know what type muffler this is, but would it really matter? The other is a Flowmaster 3" exhaust for an 87 to I believe 96 , which my truck is an 85 ( I can't remember the exact ending year) with a 70 series muffler. Which one would you guy's chose? The Summit is a whole lot cheaper. I can't find anything else or do you guys know of anything else out there? Wouldn't the Flowmaster exhaust wouk on my truck?
Posting Guru
Joined: Mar 2007
Posts: 1,649
Likes: 2
Interesting, I am aware of the Positive and Negative pressure waves, but, haven't read anything yet to acknowledge they are in relation to if not one of them is the "backpressure" occurrence. Since I am limited with internet, could you PM me that entire link Doug?? if thats no trouble for you.
Junior User
Joined: Jan 2008
Posts: 55
Likes: 0
When I did my first 460 rebuild I found a huge weight savings by installing aluminum intake manifold and losing the stock cast iron. Headers in addition to scavenging offer a weight savings. Can you strip off the emissions? I had two smog pumps and brackets which also weigh a lot. With these changes I got better performance and better mileage. Hope this helps.
Thread Starter
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Senior User
Joined: Jun 2006
Posts: 187
Likes: 2
OK guy's I want to ask another question here. 385serieshemi kind of addressed this but I want a clarification as to what everybody thinks. If you were rebuilding your motor would you put the EGR valve back on it or not? I have the Ededlbrock #1406 carburetor on it now.
Posting Guru
Joined: Sep 2004
Posts: 1,915
Likes: 1
From: Yokosuka, Honshu, Japan
When I did my first 460 rebuild I found a huge weight savings by installing aluminum intake manifold and losing the stock cast iron. Headers in addition to scavenging offer a weight savings. Can you strip off the emissions? I had two smog pumps and brackets which also weigh a lot. With these changes I got better performance and better mileage. Hope this helps.
I do agree that an aluminum intake and (emissions-equipped) headers save a lot of weight and yield better mpg's and performance, though. OK guy's I want to ask another question here. 385serieshemi kind of addressed this but I want a clarification as to what everybody thinks. If you were rebuilding your motor would you put the EGR valve back on it or not? I have the Ededlbrock #1406 carburetor on it now.
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Thread Starter
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Senior User
Joined: Jun 2006
Posts: 187
Likes: 2
Right now it has a cast iron intake. The reason I'm asking this question though is because I plan on replacing it with an aluminum intake during the rebuild & I'm wandering whether to get an EGR intake or NON EGR intake.
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