Too much open spring pressure?
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Too much open spring pressure? Have a set of comp cam 26926TS-KIT summit has them listed at 505LBS open pressure while I read on an old forum thread that they are more close to 465LBS but was wondering if stock 317 valves and rocker arms would suffice or should I look into getting some comp cam magnum pro or ultra golds
Have a set of comp cam 26926TS-KIT summit has them listed at 505LBS open pressure while I read on an old forum thread that they are more close to 465LBS but was wondering if stock 317 valves and rocker arms would suffice or should I look into getting some comp cam magnum pro or ultra golds
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The valves will be fine, those springs were meant as a drop in ls3/l92 so it's not that radical. I would just do a trunnion upgrade and should be fine. I've seen stock rockers handle well over 559+ open pressure. They are 505lbs rate, not total open pressure. The 465lbs open at max lift sounds right given a . 600-.630 lift cam.
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Joined: Jul 2007
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From: Wilmington, De
I'd look at using the Summit SUM-174005 beehive spring if you are keeping the factory rocker ratio.
The BTR SP001 valve spring will also work for both the stock 1.7 ratio and the 1.8 ratios, should you choose that path.
- Installed Height (in.):1.800 in.
- Seat Pressure at Installed Height (lbs.):140 lbs.
- Open Height (in.)(application):1.170 in.
- Open Pressure (lbs.):350 lbs.
- Coil Bind Height (in.):1.100 in.
The BTR SP001 valve spring will also work for both the stock 1.7 ratio and the 1.8 ratios, should you choose that path.
- 155 lbs @ 1.780” Installed pressure / height
- 380 lbs @ 1.180” Open pressure / height
- 400 lbs @ 1.130” Open pressure / height
- Coil bind @ 1.070”
Thread Starter
Teching In
Joined: May 2025
Posts: 20
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I'd look at using the Summit SUM-174005 beehive spring if you are keeping the factory rocker ratio.
The BTR SP001 valve spring will also work for both the stock 1.7 ratio and the 1.8 ratios, should you choose that path.
- Installed Height (in.):1.800 in.
- Seat Pressure at Installed Height (lbs.):140 lbs.
- Open Height (in.)(application):1.170 in.
- Open Pressure (lbs.):350 lbs.
- Coil Bind Height (in.):1.100 in.
The BTR SP001 valve spring will also work for both the stock 1.7 ratio and the 1.8 ratios, should you choose that path.
- 155 lbs @ 1.780” Installed pressure / height
- 380 lbs @ 1.180” Open pressure / height
- 400 lbs @ 1.130” Open pressure / height
- Coil bind @ 1.070”
Thread Starter
Teching In
Joined: May 2025
Posts: 20
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