Story of a swinger 340
- Thread starter Dart Frog
- Start date
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When picking my camshaft I kept my six pack in mind. I have never ran a solid before but wanted to give it a try because if I'm tuning three carburetors I might as well be setting lash too LOL. My camshaft choice was a Mopar circle track cam once again. New Old stock p4529970. This cam comes in at 284 advertised duration, 525 lift and 241 @ 50 . I feel this cam has about 232 of effective duration after lash on a 106 centerline and right around 500 lift after lash.
This cam became surprisingly in need of a lot of valve spring to control float. 90 lb on the seat and two 260 ish on the nose were only good for about 4000 RPMs where severe valve float began. I really couldn't believe it and thought I was possibly having a fuel problem or ignition problems and dinked around with it for too long trying determine the problem.
I even shimmed the springs up and noticed a slight improvement. So I remove the springs one more time.
I even shimmed the springs up and noticed a slight improvement. So I remove the springs one more time.
Thanks Garrett I'm glad someone's reading this post LOL.
I’m sure the light springs were great for breaking the cam in, though. For anyone wishing to look further into the spring specs, here’s the tfs link. They’re one of PAC’s “hot rod” springs.
Trick Flow Specialties TFS-16315-16 Trick Flow® by PAC Racing Dual Valve Springs | Trick Flow Specialties
But that’s definitely a great small block performance cam!
Trick Flow Specialties TFS-16315-16 Trick Flow® by PAC Racing Dual Valve Springs | Trick Flow Specialties
But that’s definitely a great small block performance cam!
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