have a built motor that I'm having to pull apart and go through. Heads have some mild port work. Everything else is stock. Be running a f1A procharger up to 20 psi. Thinking I should upgrade the valve springs while it's apart. Was wondering your guys thoughts on that. If I do I'm guessing to just run the mmr valve springs??
Head upgrades
- Thread starter Tenntitans
- Start date
Would they be good enough for 20 psi/1000hp setup???
I can't give you a canned answer because the spring's effective rate will decrease with more boost. If I were you, I would look at spring rates when you buy and talk to a respected engine builder.
Boss Spring apply 300 N closed and 700 N opened
GT springs apply 265 N closed and 650 N opened
Big write up about this. I stumbled upon it the other day. Do a search and I'm sure you'll find it. It definitely has biased opinions as usual but very informative on all kinds of springs and when to use them.
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I've looked a little n couldn't find a lot. Probably just upgrade springs n that's it.
Most of what I found was port work which is already done
brian tooley valve springs also have a great rep and price point, not sure on pressure specs though
Is BTR offering a Coyote spring yet? I know they had 2v and 4v springs, but no coyote stuff yet.
Anyways, a good drop in spring that works with stock retainers is the Trick Flow. That's what JPC uses in all of their turbo builds. I personally run PAC springs and retainers in my NA motor.
Anyways, a good drop in spring that works with stock retainers is the Trick Flow. That's what JPC uses in all of their turbo builds. I personally run PAC springs and retainers in my NA motor.
Looks like I'll go with the trick flow ones from jpc. Was going to get the mmr upgrade but I wasn't sure if I really needed the upgraded retainers or nkt
MMR springs are junk. I have a set sitting here in my garage that are worthless. None of them tested anywhere their advertised pressure.
I'll just run the trick flow springs from jpc. Do I need to worry about the retainers or will the stock ones be fine
The stock retainers will be perfectly fine.
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