by 427dart » Tue Jun 30, 2020 10:05 amChebby noobs read up.
Well I started in stages over a period of 3-4 years. When new I did basic things like rejetting the factory 585 Holley and with the dealer installed 3.73 gear in the little 7.5 rear I was running 14.70's with the stock Gatorbacks spinning like crazy.
Next I put a better curve in the distributor, added the Kaufmann hot hyd. roller cam in place of the factory roller. Cam had 212/222 duration with .496 lift something like the old 428 CJ cam. Also swapped on a pair of 1969 351W heads C90E that somebody gave me 10 yrs. before I owned a Ford.
I cleaned those up and added 1.900 intake valves and ground out the exhaust smog hump in the port. Topped it with a Eddy 289 Performer doctored up to look like the smaller factory aluminum intake. On the stock tires again would run easy 14.30's at 102 MPH spinning those greasy Gators with an easy 1500 RPM launch. Installed a pair of 7.5 inch x 26 Hoosier oval track recaps and ran a 14.0 at 103 with easy launches due to that 7.5 rear end.
In 1989 I built my own Tri-Y headers with a single collector exit much like the old Camaro SLP headers back then from a Dougs Header kit since I was still running the factory single convertor mid pipe. Also had a cutout added in front of convertor. With a fresh pair of the M&H G-60-15 street slicks I ran 13.30's at 104 again not beating on it with the 7.5 rear.
Next year I improved the air filter assembly with a NASCAR type cowl setup and moved up to the Ford B 303 cam and got in the 12.90's at 108 with easy launch 2.04 60 foot times...still 7.5 rear end and 3.73 gear and the little 585 factory Holley carb.
In the early 90's I swapped on the new iron GT-40 heads and the Weiand Excellerator small single plane intake along with a new 9 inch Ford rear setup with 4.11 gear and Detroit Locker. By this time I had replaced the stock T-5 trans with the beefier latest upgraded Ford T-5 trans.
With those M&H G-60-15 tires and some T-bird aluminum spare front runners I was in the 12.60's at a bit over 109. I never really beat on the thing with hard launches. More like 3000-3500 launch.
I tried a Holley 750 DP but it was only worth about a .2 MPH so put that factory "tweaked" 585 Holley back on.
Those were some fun times in the early 5.0 Mustang days!
Great read Steveo. Thanks! 😜