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1G Used valve springs

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AWD-Tony

Proven Member
6,801
3,735
Sep 11, 2017
Cincinnati, Ohio
What’s up fellas!! I’m starting a t belt service, removing head to clean and lap valves, stage 1 porting I & E.

Question 1
I’ll check for block and head for straightness. If they are, can I get away with not having the head decked?

Question 2
What are your thoughts on used value spring? Found these and my setup is below but I plan on bigger injectors, cams and kiggly hla next. I’ll post my current tune when I get a chance.
Stock bottom and top
16g
Injduty high 80-90%

Thanks
Tony
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I would say they are fine. I am not up to date on their spring pressure. I think our stockers are 36#. Evo will be an upgrade as long as you aren't going with real big cams later on. Try to research their spring pressure or ask Austin at STM.
 
Evo springs are more of a lateral move than an upgrade. A good stock dsm spring should be about 66lbs on the seat, the evo ones are less(somewhere in the high 50's iirc), but they make up for it (sorta) with less mass. The less mass helps you run bigger cams with less spring. We don't have a problem with that. We need seat pressure to hold the valves shut and prevent boost/exhaust pressure from blowing them open. Evo retainers also reduce seal to retainer clearance by a lot.

If you need budget springs pick up a new set of bc1100's or some other single spring like the ones from manley or Crower. Your spring choice should also be coordinated with future cam choices. for some OG 272's like HKS, Crower, Web, FP2, a cheap single is fine, even good stock springs are fine if you keep boost and rpm reasonable. Some of the more modern 272 kelford, gsc, bc ect need good springs though.

I'm sure some guys will come in here spounting off about "buy once" and all that nonsense. Don't buy $400 springs because 5yrs from now you might do kelfords or whatever. None of this shit lasts forever.
 
You can use the stock retainers, and the stock cotters (locks) as long as you use Dsm springs, if you use Evo springs they need their own retainers from an Evo.
 
You can use the stock retainers, and the stock cotters (locks) as long as you use Dsm springs, if you use Evo springs they need their own retainers from an Evo.

Got it. Thanks Matt!
 
I have a few sets of those evo springs and a set of bcs as well.. I keep buying built heads with springs already installed :banghead: to mimic what moto and bastard have said.. if you use evo springs you will need the retainers and locks to go with them.
 
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