Well Ive been to the track a couple of times since I did this mod to my intake and 1/2" spacer. Both intake and spacer started like as 4 hole quadrajet stuff. On my particular vehicle combo I really dont see any improvement at all. Mph seems about the same as well as ET,,,,60 ft actually might have gotten slightly worse. Its not a racecar,,,purely street. M21,,3.31 rear,,255/60 15 BFG. Right after I did the mods it felt like throttle response was a tiny bit worse. For the heck of it I ordered a 11/16" thick plastic 4 hole spacer from holley and will try that on my intake. I will probably still do the little notch between the secondarys before I install it. Ill try thetrack one more time before the year is out and see if I can get back that little bit of 60 ft. I think I lost and see if it feels better on the street. If the car had a auto with a little bit of converter the intake mod might of worker better,
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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