General Category > Quadrajet Carb Talk and Tips
wanna help me pic a cam?
Cliff Ruggles:
A completely stock 350/300hp engine did it with a 194/204 camshaft on a 112 LSA.
That is actually an EXCELLENT cam for a 350 SBC engine build with right around 9 to 1 compression headed for a pick-up truck. Even better topped with a set of 1.6 ratio rocker arms.
I used one in a 406 with 993 heads on it quite a few years ago in a K5 Blazer. Best running SBC engine I've ever had in a heavy 4 x 4 application......
Greasy Harley:
--- Quote from: Cliff Ruggles on August 29, 2021, 05:06:15 PM ---A completely stock 350/300hp engine did it with a 194/204 camshaft on a 112 LSA.
That is actually an EXCELLENT cam for a 350 SBC engine build with right around 9 to 1 compression headed for a pick-up truck. Even better topped with a set of 1.6 ratio rocker arms.
I used one in a 406 with 993 heads on it quite a few years ago in a K5 Blazer. Best running SBC engine I've ever had in a heavy 4 x 4 application......
--- End quote ---
Does it make a difference that my truck is 2wd? I was looking at cams with slightly longer intake durations @.050, 204-206ish. Am I gonna hate life if I go with a slightly longer duration? The chart I was looking at https://www.crankshaftcoalition.com/wiki/Cam_and_compression_ratio_compatibility points me towards the intake at .050 in the 204-208 range for 9.25:1.
I'm defiantly not an expert and have only a basic understanding of how and why lift/duration/LSA matter. That's why I ask questions.
What kind of lift should I be looking at?
old cars:
--- Quote from: Greasy Harley on August 29, 2021, 07:35:43 PM ---Does it make a difference that my truck is 2wd? I was looking at cams with slightly longer intake durations @.050, 204-206ish. Am I gonna hate life if I go with a slightly longer duration? The chart I was looking at https://www.crankshaftcoalition.com/wiki/Cam_and_compression_ratio_compatibility points me towards the intake at .050 in the 204-208 range for 9.25:1.
I'm defiantly not an expert and have only a basic understanding of how and why lift/duration/LSA matter. That's why I ask questions.
What kind of lift should I be looking at?
Then your right on track. 204-206ish would be considered a True Street cam. look here https://www.competitionproducts.com/Elgin-Chev-SB-Hydraulic-Flat-Tappet-Kits/products/2119/
--- End quote ---
Cliff Ruggles:
The link to compression ratio vs cam duration is OK but has one MAJOR flaw in it. You have to take CID into consideration as well.
The requirements for a 350 build at 9 to 1 compression are different from a 454 build at 9 to 1.
A 204/214 cam in the big 454 would be pretty tiny and lower power range than the little 350 engine.
Nice to see some single pattern offerings in the other link from Elgin. With the early SBC heads single pattern camshafts work fine. We used to use the Crane Blazer 288H cam in 350 truck builds back in the old days. It was a home-run if you were smart enough to use the .020" thick factory head gaskets to keep the quench tight and better flowing heads.
I learned about 882 heads the hard way as I obtained a set for the 350 that was powering my 1970 GM 3/4 ton truck. Like an idiot I traded my 441's for them when they valve guides got worn enough the County was trying to hire me to kill mosquitos in the summer months!
I installed those heads with no other changes and turned my strong running 350 into a complete TURD! I yanked them off so fast and got my 441's back and had them rebuilt, re-installed and power was restored.
My first good lesson in head castings and after that deal I really started looking at port flow, combustion chambers, etc and not just the size of the valves. Way back then about all anyone knew was "2.02's", "1.94's" or "double hump" when identifying cylinder heads for SBC engine builds........
Mudsport96:
I would look at one of these if i was doing a truck build. I left the first one in there since it would work with tpi i would think it would be ok for a carb build.
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