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I heard from the speed shop today.

SteveSS

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We took the Mopar with the 360/408 stroker motor to a racing shop about 10 days ago. It was falling on its face after about 3500 rpms and making some noise from the top of the engine. The engine came from Blueprint Engines about 7-8 years ago and it doesn't have many miles but it hasn't been treated all that kindly. Burnouts etc.

I think I can say the name of the shop here. It's Steve Mills Racing. Steve was nice enough to listen to it when we dropped it off. I should mention here that engines running above 6000' whole different ball game than lower elevations. Sounded like valve noise from the back passenger's side piston.

He called today and said the valve spring loads were all over the place and not as strong as what we needed. Mine are varying around 600 when he thinks it needs 1000 or above to be safe. If that solves both problems I'm a happy camper but I wanted to run it by you guys.

I don't think he's messed with the fuel/air mixture yet and that may be another problem. When we pulled plugs they were black and one was kind of wet.
 
1000 PSI springs are some serious hardware.
What kind of cam is it?
 
Seriously, 600 is a very stiff spring, I've never run one over 450 and it was on my 340 spinning it 7600 RPM.
 
For comparison my comp 911 springs measured right around 130 seat load, and they are the recommended spring for the cam I run which is under .500" lift...so even with a stockish cam in the neighborhood of .450", 60 does seem weak to me that could very well be the issue. 408 stroker? Sounds like it might have a little more cam than that...
 
If you trust the shop enough to let them do the work, you should trust them enough to select the correct parts to remedy the problem.

I know how much I love having people tell me how to do my job...... that I have 28 years of experience in.
 
:DHey Dave

I didn’t mean to come off as a dick with my comment........ but my point was that most shops don’t love it when the customer comes in with advice they’ve gleaned from the internet, to fix something they brought to the shop to have them perform the repairs on.
 
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If you trust the shop enough to let them do the work, you should trust them enough to select the correct parts to remedy the problem.

I know how much I love having people tell me how to do my job...... that I have 28 years of experience in.
Yeah, this should be all CAPS.
 
Being solid (and right in my opinion) in one's perspective doesn't mean one is being a dick.

Plus, you know the boards - some are thicker skinned than others. We got pretty thick skin here from what I've experienced.
 
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