General Category > Quadrajet Carb Talk and Tips
off idle stumble/lean mixture
jwilson645:
--- Quote from: Cliff Ruggles on November 09, 2016, 07:10:13 AM ---What is the compression ratio and which XE cam are you using?.....Cliff
--- End quote ---
Compression is 9.56 and I'm currently using the XE256H
Cliff Ruggles:
The XE256 cam is WAY too small for 355cid at 9.56 to 1 compression. A stock replacement cam has 274 degrees seat timing. Small cams close the intake very early, especially on a 110LSA. I'd look at something with more advertised and .050" duration on a 112-114LSA.
The generic 214/224/112 cam from Summit would be a very good choice for what you are doing.....Cliff
jwilson645:
--- Quote from: Cliff Ruggles on November 11, 2016, 03:50:24 AM ---The XE256 cam is WAY too small for 355cid at 9.56 to 1 compression. A stock replacement cam has 274 degrees seat timing. Small cams close the intake very early, especially on a 110LSA. I'd look at something with more advertised and .050" duration on a 112-114LSA.
The generic 214/224/112 cam from Summit would be a very good choice for what you are doing.....Cliff
--- End quote ---
Thanks for the info, Cliff. The .466 lift of that Summit cam isn't too much for stock Vortec heads is it? I've head the stock springs can only hold up to .450 cam lift.
Cliff Ruggles:
The only way to know how much lift a spring can handle is to test it. Most stock SBC springs are fine with .460" lift or a tad more, but in all cases they should be checked with the retainers being used to see if they have enough room.
You also must check retainer to seal clearance.....Cliff
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