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#1 |
N-V-ME
Join Date: May 2005
Location: SOUTHFIELD,MICHIGAN
Posts: 155
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![]() I Hear Different Storys And Read Different Stuff On These,,,,,but Do They Give More Duration An If So How Much I No It Gives More Lift Whats The Difference From 1.7's An 1.72's How Much More Lift...........
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88' LX MUSTANG: LINCOLN ROTORS , AIR SUSPENSION FRONT AND REAR, SUBFRAMES, ROLL CAGE, 92' BLOCK, MSD 6AL, ACCEL 8.8 WIRES, ACCEL COIL, EDELBROCK F4B INTAKE (PORTED),2 IN. 4 HOLE SPACERS, HOLLEY 600 CARB.,HOLLEY BLUE FUEL PUMP AN REGULATOR, E 303 (.498 IN. 220 DUR.) CAM, (.535 IN. OF LIFT W/ 1.72 SCORPIN ROLLER ROCKERS), PORTED E7'S, FLOWTECH 1 5/8 LONG TUBE HEADERS, 2 1/2 IN. H PIPE, 2 CHAMBER FLOWMASTERS WITH 3 IN.DUMPS, T-5, 3.73 GEARS, 5 LUG AEROSTAR AXELS, 245-45-17 96' COBRA WHEELS |
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#2 |
Guest
Posts: n/a
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![]() Not sure how much additional lift the bigger ratio roller rockers give you exactly...but I think my B-303 cam has something like a .494 lift. The 1.72 rollers I installed brought it up to a .512 lift I believe. As far as I know, the bigger rockers will not increase your duration...just the lift. As for what's the difference between 1.7 & 1.72 rockers...I would say next to nothing. The difference would be very minimal being that they are only .02 inches longer. I guess the 1.72 rockers might give you 1-3 thousandths more lift, lol. The increase in lift #s that I listed may be a little off...but I'm sure someone else will chime in with better specifics.
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#3 |
N-V-ME
Join Date: May 2005
Location: SOUTHFIELD,MICHIGAN
Posts: 155
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![]() A B Cam Has .480 In. Lift W/ 1.6's .510 W/ 1.7's 1.7's Give You .30 In. Lift Extra To Your Cam But What About 1.72's
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88' LX MUSTANG: LINCOLN ROTORS , AIR SUSPENSION FRONT AND REAR, SUBFRAMES, ROLL CAGE, 92' BLOCK, MSD 6AL, ACCEL 8.8 WIRES, ACCEL COIL, EDELBROCK F4B INTAKE (PORTED),2 IN. 4 HOLE SPACERS, HOLLEY 600 CARB.,HOLLEY BLUE FUEL PUMP AN REGULATOR, E 303 (.498 IN. 220 DUR.) CAM, (.535 IN. OF LIFT W/ 1.72 SCORPIN ROLLER ROCKERS), PORTED E7'S, FLOWTECH 1 5/8 LONG TUBE HEADERS, 2 1/2 IN. H PIPE, 2 CHAMBER FLOWMASTERS WITH 3 IN.DUMPS, T-5, 3.73 GEARS, 5 LUG AEROSTAR AXELS, 245-45-17 96' COBRA WHEELS |
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#4 | |
Guest
Posts: n/a
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#5 |
Registered Member
Join Date: May 2005
Location: York, PA
Posts: 46
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![]() to get value life you multiply cam lobe lift by rocker ratio. it does not affect duration at all.
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1990 Notch, 306, T-56 trans, 3:73 gears, zex 100 shot, gt-40,z-303 cam, roush 200 heads, powerdyne on the way |
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#7 |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() The 1.7 lifters give more VALVE duration, not cam duration. The valves open earlier and faster giving more area under the curve for airflow.
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Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/ |
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#8 |
Registered Member
Join Date: May 2005
Location: York, PA
Posts: 46
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![]() it opens the same time it will just have more lift
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1990 Notch, 306, T-56 trans, 3:73 gears, zex 100 shot, gt-40,z-303 cam, roush 200 heads, powerdyne on the way |
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#9 |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() At the cam face it lifts the same - NOT at the valve tip which is where the air enters. This debate occured on Corral too, and Buddy Rawls mocked up both with a dial indictor and degree wheel on an engine that he uses to check his cams and proved that the duration at the valve is longer. I forget how many degrees were added, but if your after every last deatail to make power - this is one that works.
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Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/ |
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#10 | |
cranky old man
Join Date: Sep 2001
Location: Longview Texas
Posts: 683
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Under Construction: 64 Falcon 372 cu in. stroker 1:72 rod ratio 6.250" rods (long rod), Comp Cams XE274 230/236 520/526 @ .050, Scorpion Rollers, Roush 200 irons, 10:1 Keith Blacks, Hedman long tubes, 750 Holley DP, Edelbrock Victor Jr., C4 3500 stall, gears and tires to be anounced. |
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