Yesterday, 02:20 PM | #1 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,743
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Which CAM?
77 truck short block (stock dish pistons )
64cc iron heads with 2.02/1.6 valves and 184cc intake runners Edelbrock 2101 intake Stock Qjet (77 k10 auto) Hooker super comps 1.875 primary tubes Transmission is BW super T-10 Rear gear is a 3.08 but will go to 3.55 /3:73 in future Tire size is 265/60r15 Weigh is # 3500 Driving will be street not a race car, no towing. Would like some recommendations in both flat tap and roller. Would also consider solid lift cams. Somethibg like a COMP 268h? Thanks for any input!
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1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
Yesterday, 02:45 PM | #2 |
Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,455
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Re: Which CAM?
I ran both the HE and XE 268 cams. Don't really remember the HE, it was over 25 years ago. But XE sounded wicked in my TBI406, pulled like a freight train. But can't go wrong with either.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
Yesterday, 03:55 PM | #3 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,697
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Re: Which CAM?
Two items in your combination need serious consideration when selecting a cam.. Those dish pistons = low compression.. Most performance cams need a minimum of 9.0 + compression. Longer duration moves the power band up the RPM range. That 3.08 rearend ratio and low compression just hinders any moves in that direction..
Carburetor, intake manifold, camshaft profile, if automatic transmission the torque converter stall speed, rearend ratio AND distributor curve -- all play an important part in the "package"... |
Yesterday, 06:01 PM | #4 | |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,743
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Re: Which CAM?
Quote:
Those are good points. With my 64CC heads and a .015 or .018 head gasket should my compression be 9.0 or closer to 8.5? My current short block would be no good for a cam making power above 6,000 rpm. Feel free to offer opinions and recommendations i am reading and learning as much as i can. I think the manual transmission and planned reqr gear change really helps what i am tryibg to do.
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1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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Yesterday, 10:18 PM | #5 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,697
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Re: Which CAM?
The actual final compression ratio not only depends on the combustion chamber volume, but also the volume of the dished area of the piston.. Long duration camshafts require higher compression ratios..
As for the lifter recommendation.. Solid lifters are not very friendly on the street. There's nothing wrong with quality hydraulic lifters. Because of the modern oil formulas, flat tappet lifters are at risk. |
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