My car is a 70 skylark with a 462 stock head, unknown isky cam, eldbrock intake , holly 870 cfm carb, full msd ing. TH-400. GM 12 bolt rear w/ 3.73 and 33 splin axles. 90/10 with moroso tricks in the front and 50/50 in the rear all on 28x10 MT ET streets the car has run a best (worst) of i can only hold the car at the line to about 1800-2000 rpms with out creaping thru the lights. 60' ...1.870 330'....5.409 1/8 ...8.421 mph...81.02 1000..11.050 1/4.....13.285 mph....100.64 What is the next step. What intake and carb? also what cam? heads? Tranny / converter? should i run thank you Brandon :TU:
I have no idea. i think its real low because at about 2000 rpms it starts to break the tires lose I am thingking of buying a new tranny and coverter. just need some help to find the best combo
A top quality converter stalling 2500-2800 would be your best bet. Don't skimp. These motors eat $200 converters for lunch (or maybe launch) Be prepared to spend at least $500 for a converter that will take the torque. You will be smiling when you do. Be sure to add an external cooler. I launch at @2000 rpm, squeeze the throttle, and let the converter flash.
if your carb is a vacumm secodary carb, it needs to be adjusted just right. i was having 60 ft in the 1.85-1.91 range ,i found out that i was launching with just 2 barrels after adjusting they dropped right down to 1.73 and lower, i sence have done some more fine tunning and next time out i hope i can see a mid 1.6,60 ft.i have a 4000 s/p that i launch just above idle , it seems to 60 ft the best doing that . i would then pull the heads and do some bowl blending, and have a good three angle valve job done,then put some header on it,your carb and intake are fine till you drop into the 11's , keep the cam if it revs good past 5000 rpm. then you should be in the 12's ,just my 2 cents Kelly
Try the Jeg's brand converter, I run the higher stall version and love it! $400 also, plus as far as I can tell it's made by Hughes. Just make sure you add a tranny cooler if you don't have one already. Kelly E.
Torque convertor. I agree, a 2800 stall convertor is large step in the right direction. MSD unit and start tuning.
Brands: Carb tuning is equal parts witchcraft, knowledge and trial and error! Couple of suggestions. There are several pretty decent books out there on carb tuning. Everything from brand specific to general 'one-size-fits-all' books. I'd say find one specific to your carb. If you want to learn carb tech, get a book and study it. Pull out those things that affect the carb and make kinds of changes you are looking for in your application. Make changes slowly and in small increments. Above ALL! Change one thing at a time! If you make three or four changes all at once and it gets worse, what caused the problem? What if the effect is no noticable difference? Change one thing at a time and if it gets worse, change it back. Keep a written log of the changes you make. That way, you won't do like many of us have done and thinking you replaced your 75 jets with 77 jets, you put in some 79's because it only got a little better. Then it runs way worse. Turns out you actually had put 73's in it and needed to go a bit leaner. Write it down!
