General Category > Quadrajet Carb Talk and Tips
Newly Built 383 Stroker w/Quadrajet
Ethan1:
Believe he has a Howards cam: http://www.competitionproducts.com/Howards-Cams-Hydraulic-Flat-Tappet-Camshaft-Chevrolet-SB-225_235-050-465_470-110-LS/productinfo/112581-10/#.WZyDMSiGPIU
LSA is 110 degrees.
ykf7b0:
It is a custom convertor built by PTC and it's spec'd by Kenny Ford himself. You are correct, it is a Howards cam with 110 LSA.
Cliff Ruggles:
I've heard PTC makes good converters but haven't ever used one here.
We have been selling converters for over 20 years, all built to custom specifications. We used Continental until they went out of business last year, and are now using TSP converters.
Not familiar with that camshaft so can't comment on it. I typically shy away from tight LSA for street engines due to increased overlap, degraded idle quality, stinky exhaust, and increased dynamic compression lower in the rpm range.
Some folks use them with decent success, but we build, dyno, street and track test most of our engines here and the wider we go with LSA the better the results have been. I know this goes against the grain a bit as most cam manufacturers use and recommend tight LSA.
I think is done more for the "bling" factor than anything else, as most folks want to hear some "lope" in the exhaust at idle speed instead of having it sound like a tractor engine......FWIW.....Cliff
ykf7b0:
I went with a 110 LSA when almost all were recommending a 108 so I'm am a bit surprised to get a nod towards a 112 LSA or wider. Overlap with the 110 is 64 degrees.
77cruiser:
Mine is 107 in my 421, doesn't idle too bad.
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