97 back on the road after valve spring replacement
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10 Second Club
Joined: Apr 2002
Posts: 315
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From: VA
97 back on the road after valve spring replacement Some of you may remember my broken valve spring of late October:
https://ls1tech.com/forums/showthrea...08#post2009008
Finally got some free time and replaced them starting with #6 in the pictures below. Also did valve seals as I put on PP's spring seats.
Thanks to the good old LISLE valve spring compressor/cyl. Air pressure line they are done without issue!
Seems to run fine, after a heat cycle we took it out for a spin, runs stronger than ever.
A few things I noticed different between the Pioneer & PP Gold springs:
Pioneer spring uses 3/16 dia. outer wire and near 1/8" inner and both seat & retainer are a slight interference fit on the spring
PP Gold uses 5/32 dia. outer wire and right at 1/8" inner, is 3/16 taller and has a looser fit for both the seat and retainer
I like that loser fit better as I noticed some galling on the Pioneer spring seats & retainers.
Funny thing .both double springs weigh exactly 3 Ό oz each!
Time will tell but all should be well.
https://ls1tech.com/forums/showthrea...08#post2009008
Finally got some free time and replaced them starting with #6 in the pictures below. Also did valve seals as I put on PP's spring seats.
Thanks to the good old LISLE valve spring compressor/cyl. Air pressure line they are done without issue!
Seems to run fine, after a heat cycle we took it out for a spin, runs stronger than ever.
A few things I noticed different between the Pioneer & PP Gold springs:
Pioneer spring uses 3/16 dia. outer wire and near 1/8" inner and both seat & retainer are a slight interference fit on the spring
PP Gold uses 5/32 dia. outer wire and right at 1/8" inner, is 3/16 taller and has a looser fit for both the seat and retainer
I like that loser fit better as I noticed some galling on the Pioneer spring seats & retainers.
Funny thing .both double springs weigh exactly 3 Ό oz each!
Time will tell but all should be well.
Thread Starter
10 Second Club
Joined: Apr 2002
Posts: 315
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From: VA
Originally Posted by NOSjohn
Non-stock spring...odd. I haven't read the other post but I imagine you have some mods done to reach 10's. What cam and what was the issue related to the spring breaking?
Cam is .581 with 230s......I suspect a bad spring from day one, all the other plugs read great. This one was always black
No doubt, I like hearing about these things. There is always the exception to the rule. I also like the idea of tuning with plugs. So many people rely on their "electrical" means of tuning, i.e. - laptop, diablo, scan, etc....what ever happened to just looking at plugs? 
I still look at mine every once in a while, just to get an idea. I know from experience, sometimes "devices" aren't so accurate or lose their accuracy. It's good to have a back up method. 
I still look at mine every once in a while, just to get an idea. I know from experience, sometimes "devices" aren't so accurate or lose their accuracy. It's good to have a back up method. Thread Starter
10 Second Club
Joined: Apr 2002
Posts: 315
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From: VA
Originally Posted by NOSjohn
No doubt, I like hearing about these things. There is always the exception to the rule. I also like the idea of tuning with plugs. So many people rely on their "electrical" means of tuning, i.e. - laptop, diablo, scan, etc....what ever happened to just looking at plugs? I still look at mine every once in a while, just to get an idea. I know from experience, sometimes "devices" aren't so accurate or lose their accuracy. It's good to have a back up method.
I still look at mine every once in a while, just to get an idea. I know from experience, sometimes "devices" aren't so accurate or lose their accuracy. It's good to have a back up method. Thread Starter
10 Second Club
Joined: Apr 2002
Posts: 315
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From: VA
Originally Posted by allthrottle&nobottle
I suspect a bad spring from day one
