Quote:
Originally Posted by OrigOwner77
Car in question is my 80 T/A:
1968 "YA" 400, possibly 30 over. 1969 #62 heads. Motor internals are supposedly stock or very stock-ish (cam, etc). <snip>
For example, the car pulls strong off the line in gear, but then revving in park/neutral produces a slight stumble. Also, when in high gear doing about 40 mph, if I coast and then accelerate again (slowing down, and then resuming speed), the car almost feels like the trans slips. <snip>
The carb is all stock, as shipped by Holley. I've added a quick-change secondary kit to it and I believe I have the medium spring installed. I've not touched jets, squirters/shooters, etc. I'm running the orange pump cam in position 2 at present, as this has helped the throttle response.
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You didnt mention what your idle setting is, but if this "stockish" engine has a lower idle
(600 - 850) shifting the primary orange (#41R466) pump cam from #2 position to #1 to
eliminates the delay in pump action. Position #2 rotates the cam so that all the pump shot is available for more open idle throttle settings. This will delay the shot for lower idles.
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1977 TA 400 9.5:1 CR 351hp 414LbFt, #13 Heads + 1.52 Roller rockers, 1968 Pontiac 400 intake, Holley 4165 650 DP #7054
Howards Hyd .447/.467 IN:288 EX:298 214/224@.050, MSD6A + MSD timing control + H2o/Meth
1-5/8" headers, Magnaflow 200CPI Cats + 2.5" Pypes X, Dynomax STs, TH-700R4 2200 stall, 3.42 Eaton 10-bolt, PS/PB/PW/PL/AC/Cruise
13.84@100.14mph 2.18 60' on P255-60-R15 radials, pump gas, mpg : 21.5 hwy 15.2 city
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