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#101
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Thats what I have old G-teck. That vacuum secondary Holly will make it feel like a dog. I’m guessing secondary jetting is off. From what I remember my Buddy with 70 Ram IV Judge, thought it would be faster with that Holly crab. Over the Q’jet it cam with. Long story short I ended up putting a metering block and jetted baby up in the secondaries. His motor was Ram IV 400. He ended up running 12.70’s with it. Stock Ram 1V cam. Yeah with that cam, even if you play with carburetor not going to make much difference.
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#102
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See whats in that Holley secondaries for jets. You should be around 72’s in the primaries and 76-78’s in secondaries. See whats in there for jetting.
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#103
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I’m addressing the carburetor because if you end up going with Crower 60619 cam, jetting will still be a issue. From my memory think I ended up with 72’s in front and 76’s in the back. Either way that 2802 cam is a dog, Great Cam for mom station wagon. LOL
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#104
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Thanks. I know I jetted up in the front, but think I left the rear alone. I'll have to give it a look. |
#105
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Definitely do, see whats in back.
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#106
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Gach,
Really? Check the spec on that cam and a Summit 2802. Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#107
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I did however change the accelerator pump nozzle to a .045 Part number 121-145 It came with a .031 nozzle and that was too small. |
#108
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Sent you a PM. Thanks
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#109
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The G tech meter we had provided pretty high mph numbers, but seemed fairly accurate on 1/4 mile times. Not close to as accurate as a draggy.
The 750 Holley’s I have had worked good out of the box in moderate to mildly built 350 to 400 applications. Double pumpers, vac secondaries, didn’t seem to matter. The 750 Holley’s I have done were lean on big engines. One 750 I worked on came off a dyno, and had 430HP on a 383 SBC, we tried it on a 462 with a 60919, ported 96 heads, RPM intake, and HP maniflolds, against a later 800 cfm qjet. I tuned and tuned, and could not run get the 750 Holley to run with the q jet. The 850 holley’s I have had on the other hand, run at least as good as the qjet on 455+ cubes, right out of the box. If you get into the engine to fix some oil leaks changing cams to something bigger sounds like a great idea. Only worth it though unless the induction can handle the bigger cam. Right now I doubt the induction (carb&intake) would respond much to a cam change with out some tuning. The current cam Crower sells as 60919 with the 112 LSA would works good in grandma’s 455 station wagon. Definitely not to big. |
#110
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The accelerator pump on the carb was changed from the 30cc to the 50cc one. It's the 20-11 kit.
You should not need a 50cc pump on this combo in my opinion.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#111
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Recall anything on shift points ? Could be hanging in gears to long with that first gear ratio and 3.73 it should be zipping through the early gears setting you back hard in your seat with traction
got to keep the engine loaded in its torque range..
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If your not at the table you're on the menu A man who falls for everything stands for nothing. |
#112
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I had found at one point that the valves seemed to be floating a little over 5000 rpm, so I tinkered with the governor on the trans and dialed it in to shift at 5000. While the engine is out, I'm planning to put new springs on, but was probably going to leave the governor alone.
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#113
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yeah i think your going to want to shift it quicker, i dont have a dyno seet with that cam in 462 but i bet 500-600 earlier shift point that ET. will drop
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If your not at the table you're on the menu A man who falls for everything stands for nothing. |
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#114
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Data point for the future... If your floating valves in a big engine and a smallish cam your going places it shouldn't be RPM wise
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If your not at the table you're on the menu A man who falls for everything stands for nothing. |
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#115
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Wow. That's something I never thought about, lowering my shift point to go faster. That would be worth a try and pretty easy to do too. Thanks!
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#116
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700r4 gear ratio 3.06, 1.63, 1, 0.7, and 2.9
Turbo 400 2.48/1.48. 700r4 Not as good as T-400 that explains some things. Not keeping it in the power band.
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#117
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True, but this is a street cruising convertible that sees plenty of highway use. It'll never see a racetrack.
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#118
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If the 3.06 is correct its like having to much gear, then thing fades out. Once you hit third gear.
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#119
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I understand, but definitely changes the way car will feel performance wise.
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#120
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If the valves are floating @ 5000 RPM find out why and fix it!! I am not saying a bigger cam will not make more HP than the Summit 2802, but as shown above the Summit 2802 should make enough HP for you to be running in the 12's. Stan Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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