Some new findings
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I'm saying our S1 manifolds flow much better than the S2 manifolds stock. So with a little porting, we're that much better still. 
Headers, custom from the ground up would be an incredible expense for potentially very little gain with our motors. We make most of our power down low. Not at the upper RPM'* like the S2 L67. The vast amount of upper RPM exhaust flow is why they benefit from headers so much.
Headers, custom from the ground up would be an incredible expense for potentially very little gain with our motors. We make most of our power down low. Not at the upper RPM'* like the S2 L67. The vast amount of upper RPM exhaust flow is why they benefit from headers so much.
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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
Originally Posted by OLDsman105
Thank you for clearing that up. Since I have dragged this 
. I kindly apologize to SSEimatt93 for satisfying my curiosity at your expense.
. I kindly apologize to SSEimatt93 for satisfying my curiosity at your expense.Damned good info Bill, alot of people have asked, are those headers? Well..kinda tubualr header manifolds stock..thats usually my response..
Thank god they arent big ugly massive cast SOBs heheh
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All too funny -I was just in getting my 3" DP. 3" res and 3" all the way back to just in front of the 97 SSE muffler and there were a couple GTP boys there.
I opened my trunk and they saw my extra set of exhaust manifolds and they pretty much SH!# their pants.
First guy was like "DUUUUUUUUDDDDDEE!! Will those fit my GTP?"
They were thoroughly disappointed when I had them pop a GTP hood and showed them the port positions.
BTW, my front and rear mani'* with crossover ran a grand tally of $45 for the pair.
I opened my trunk and they saw my extra set of exhaust manifolds and they pretty much SH!# their pants.
First guy was like "DUUUUUUUUDDDDDEE!! Will those fit my GTP?"
They were thoroughly disappointed when I had them pop a GTP hood and showed them the port positions.
BTW, my front and rear mani'* with crossover ran a grand tally of $45 for the pair.
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Originally Posted by SSEimatt93
Originally Posted by OLDsman105
Thank you for clearing that up. Since I have dragged this . I kindly apologize to SSEimatt93 for satisfying my curiosity at your expense.
. I kindly apologize to SSEimatt93 for satisfying my curiosity at your expense.Damned good info Bill, alot of people have asked, are those headers? Well..kinda tubualr header manifolds stock..thats usually my response..
Thank god they arent big ugly massive cast SOBs heheh
For the l;ongest I have called them Factory style headers ( You know, Wanna be true headers ) But I heard so much about it I rephrased with Tubular manifold...
In the early days of the 3800-88-91 GM called these Low restriction manifolds, the same went for the L27 and L67 through 95... I was displeased when they went to a Cast front on the series II'*....
If you park an 88-91 SSE, 92-93 SSE they are in a world of there own.... I just love the sound quality of the Old Midget factory style headers( Tubular Manifold )... Nice to hear that people mistake them for headers tho...
How are you coming with the findings BTW?
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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
Don, Bill, and fellow members, findings are great now, i swapped my stock tensioner and 2.55 pulley back on..guess what
Stumble is gone, no more, its running healthy as hell at WOT now, mind you, the boost gage only hits 8, but atleast its utilizing those 8 lbs, i ran it up to 100 mph at WOT, no stumble.
I havent scanned like this yet, but im going to, i doubt any KR will be present.
edit
Now you might ask why a person who hasnt ported anythign running a smaller pulley might not have stumbling issues? The boost is Pressurizing in the manifold, not flowing into each cylinder beyond which the stock computer can feed raw fuel.
I was flowing WAY to good with that 2.2
Stumble is gone, no more, its running healthy as hell at WOT now, mind you, the boost gage only hits 8, but atleast its utilizing those 8 lbs, i ran it up to 100 mph at WOT, no stumble.
I havent scanned like this yet, but im going to, i doubt any KR will be present.
edit
Now you might ask why a person who hasnt ported anythign running a smaller pulley might not have stumbling issues? The boost is Pressurizing in the manifold, not flowing into each cylinder beyond which the stock computer can feed raw fuel.
I was flowing WAY to good with that 2.2
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Keep driving it that way, and when you get your Jet, throw the 2.2 back on. I ran that way fine for quite awhile before my latest brainstorm. 
Good news, Matt. Double check for vacuum leaks again just for safety.
Good news, Matt. Double check for vacuum leaks again just for safety.
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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
yeah i will, i did the other night used half can of TB cleaner, found NOTHING hehehe
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