150K miles..Should i replace my stock valve springs?
#1
150K miles..Should i replace my stock valve springs?
My TPI L98 motor runs very strong. No signs of wear and tear really even for 150K miles now. I've replaced the TPI gaskets since a rear manifold oil leak occured and now its all fixed up. The lifter valley is clean..i frequently change the oil. It recieves about 5K miles a year, mainly just summer daily driving. The car just has exhaust mods and 2800stall/3.42 gear and went 13.63 at 97 with the converter never locking up. As far as i know its bone stock original motor and never been rebuilt but who knows...
I was wondering if it would be beneficial to replace my stock valve springs at all? I was hoping to possibly get some 1.6 roller rockers just to squeeze more power out of my setup. While i was at it, i figured lets change the stock springs....they have to be worn since they are weak in stock form and have tons of mileage on them. Might improve efficiency and power??
My buddy has Z28 springs brand new and i was thinkin of gettin them. has valve locks and retainers too. This seems like a great stock replacement spring with alittle more lift range than stock. not that that matters tho since i will not be changin the cam.
I mean the car runs so good now i wonder if i should even worry about it.
I was wondering if it would be beneficial to replace my stock valve springs at all? I was hoping to possibly get some 1.6 roller rockers just to squeeze more power out of my setup. While i was at it, i figured lets change the stock springs....they have to be worn since they are weak in stock form and have tons of mileage on them. Might improve efficiency and power??
My buddy has Z28 springs brand new and i was thinkin of gettin them. has valve locks and retainers too. This seems like a great stock replacement spring with alittle more lift range than stock. not that that matters tho since i will not be changin the cam.
I mean the car runs so good now i wonder if i should even worry about it.
Last edited by Orr89RocZ; 02-15-2007 at 04:49 PM.
#3
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Car: 1987 Trans Am
Engine: 5.0L TPI
Transmission: 700R4
Axle/Gears: Richmond 3.73
does the car smoke at start ups (like a small puff)? If so, I would change your valve seals, then while your in there why not swap the springs. If not.....I wouldnt worry about it. I changed my springs because I installed a bigger cam. I dont hear too many stories about stock springs breaking. But thats my 2 pennies anyway.
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Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
most diffently a good idea. youve got my vote. and its not to hard if you have the right tools and a good day to work on it. the Z28 springs should beable to take those 1.6RRs too.
#7
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Sometimes you'd be surprised how lousy stock springs are, even new. Even at only 5000 RPMs they can make a difference.
If you're in the mood for a project DON'T just replace, ALWAYS UPGRADE! A set of Comp 981 springs (or the afore mentioned "Z-28 springs") would be a significant upgrade over stock and either is a true drop-in replacement for the stock springs- no machining necessary at all. Couple that with some 1.6 rocker arms (why not, since you're in there already!) and you might just find your TPI has noticably more pull everywhere and doesn't drop off in the upper RPMs for a few hundred more RPMs.
Expect no miracles, but I've found stock-cam TPIs respond to better springs and higher ratio rockers quite nicely.
If you're in the mood for a project DON'T just replace, ALWAYS UPGRADE! A set of Comp 981 springs (or the afore mentioned "Z-28 springs") would be a significant upgrade over stock and either is a true drop-in replacement for the stock springs- no machining necessary at all. Couple that with some 1.6 rocker arms (why not, since you're in there already!) and you might just find your TPI has noticably more pull everywhere and doesn't drop off in the upper RPMs for a few hundred more RPMs.
Expect no miracles, but I've found stock-cam TPIs respond to better springs and higher ratio rockers quite nicely.
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#9
Sometimes you'd be surprised how lousy stock springs are, even new. Even at only 5000 RPMs they can make a difference.
If you're in the mood for a project DON'T just replace, ALWAYS UPGRADE! A set of Comp 981 springs (or the afore mentioned "Z-28 springs") would be a significant upgrade over stock and either is a true drop-in replacement for the stock springs- no machining necessary at all. Couple that with some 1.6 rocker arms (why not, since you're in there already!) and you might just find your TPI has noticably more pull everywhere and doesn't drop off in the upper RPMs for a few hundred more RPMs.
Expect no miracles, but I've found stock-cam TPIs respond to better springs and higher ratio rockers quite nicely.
If you're in the mood for a project DON'T just replace, ALWAYS UPGRADE! A set of Comp 981 springs (or the afore mentioned "Z-28 springs") would be a significant upgrade over stock and either is a true drop-in replacement for the stock springs- no machining necessary at all. Couple that with some 1.6 rocker arms (why not, since you're in there already!) and you might just find your TPI has noticably more pull everywhere and doesn't drop off in the upper RPMs for a few hundred more RPMs.
Expect no miracles, but I've found stock-cam TPIs respond to better springs and higher ratio rockers quite nicely.
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