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Hooooooo boy, You guys need to do this!

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Old Apr 20, 2007 | 09:05 PM
  #1  
dieselJon's Avatar
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From: Dixon, IL
Talking Hooooooo boy, You guys need to do this!

Installed the 3200rpm spring Wednesday, all I can say is, you guys who haven't done it, do it!!!! Took me 2 hours and I spent some time fabbing tools. I even turned down the power screw because I didn't want to risk a run away yet.The changing is remarkable!

A story goes with it. Today I was going through town and the road goes from a 2 lane down to a single lane while changing speed from 30 to 40 mph. Well I had this Bonneville on my rear. He was sporting a window decal that said "Supercharged". Hmmm I thought. Well going up the hill I was slowing down, him next to me. The light changes to green and I was moving so I kept it in 3rd gear. Well just starting off the line was a 2001 1500 Chebbie (looked like it) with a trailer. Well bonny is sportin' rims and rubber band tires, a guy with sunglasses with a attitude, and 2 girls in the rear seat. Well he pulls in behind me. I get in front of the truck and in about 150ft the road narrows. Well he THOUGHT he could pass me but na ah. I had just shifted into 4th and laid into the pedal. Smoked him with the exhaust and the truck! All because I changed that spring.

Just another mod to add to the list.

Jon
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Old Apr 20, 2007 | 10:25 PM
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My exact feelings about the 366 spring. Those of you who haven't done it, go do it! You will not regret those extra RPMs!
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Old Apr 21, 2007 | 11:38 AM
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Yeah, mine felt different with the spring, but I also had the fuel cranked way up after the rebuild. It pulls hard to 3500 if I am not careful.

DP
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Old Apr 21, 2007 | 12:43 PM
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This mod is in my to do list.....

Should better valve springs be installed because of the higher RPM or is it not a worry?



-Jason
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Old Apr 21, 2007 | 02:46 PM
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From: Scottsdale, AZ
Well I guess I better get this spring
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Old Apr 21, 2007 | 04:02 PM
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Originally Posted by SPINPOSI
This mod is in my to do list.....

Should better valve springs be installed because of the higher RPM or is it not a worry?



-Jason
Not a worry
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Old Apr 21, 2007 | 05:02 PM
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Not till you hit the 4k spring......I am thinking about do this mod now too after the BHAF and 4" dp mods and maybe a stage III or IV turbo.

My bank account now looks too small.

Jon
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Old Apr 21, 2007 | 09:12 PM
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Valves can float as slow as 3400rpm; valve springs are not a bad idea.

DP
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Old Apr 21, 2007 | 11:01 PM
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From: Port Crane (Binghamton) NY
The good ol 366 spring strikes again!! It is absolutly amazing, the difference is so much different. It does feel like a whole new engine!

hehe, I too have been having thoughts like "wow, if the 366 spring is this much of a difference, I wonder what the 4K RPM GSK is like??"
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Old Apr 21, 2007 | 11:09 PM
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From: New Holland, PA
A 4k GSK is very tetchy - at least in a 2nd gen.

I have not driven a 1st gen with a stiffer spring than the 366. Mine is about as twitchy as I'd want, much of this is due to swapping the ball stud for the return spring in the throttle lever.
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Old Apr 22, 2007 | 12:22 AM
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Question I Am Trying To Picture It

Originally Posted by wannadiesel
Mine is about as twitchy as I'd want, much of this is due to swapping the ball stud for the return spring in the throttle lever.
Please elaborate, maybe even some pictures, PLEASE.

Thanks.
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Old Apr 22, 2007 | 12:41 AM
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From: Tijeras, New Mexico, 7,000ft up
Originally Posted by dieselJon
Not till you hit the 4k spring......I am thinking about do this mod now too after the BHAF and 4" dp mods and maybe a stage III or IV turbo.
I can tell you that a Stage IV turbo makes the 3,200 spring sing! When I first got my truck it would only go 89mph, and that was at total defuel. Now it don't know the top speed, bit I still have 35psi at 110!!!! (uh, allegedly ).
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Old Apr 22, 2007 | 06:21 AM
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From: New Holland, PA
Originally Posted by BearKiller
Please elaborate, maybe even some pictures, PLEASE.

Thanks.
Stock setup:



Fun setup:

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Old Apr 22, 2007 | 07:23 AM
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hows your guys fuel millage once you put the 3600 on? did it change up or down?
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Old Apr 22, 2007 | 08:54 AM
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From: New Holland, PA
The 3200 RPM spring had no effect on my mileage once the "new toy" phenomenon wore off.
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