Hi Vic here from down under Australia.Its been a while since my last post,just need advise on performance gain for the quarter mile.I am running a 1970 ss monte carlo ls5 454.I Have raced the car over afew months and it has run best of 13.07@104mph. the car weighs 4220lbs. engine is 454 ls5 stock, using stock rochester carby #17056280 which is 750 cfm, updated valve springs and crane rockers,weiand action plus duel plane manifold,1/7/8 patriot 4 into 1 headers and 2/1/2 inch exhaust with hooker aerochamber mufflers.fuel system is edelbrock 12psi mech pump with carter prime pump in rear.It has 3.31 posi-track diff with turbo 400 and 2200 stall speed.The tune is 12.9-13.2 air fules dependant on adustable regulator and 42 deg total timming from msd hei, i shift the engine at 5200rpm and cross at 4400-4500rpm.i dont use the air cleaner as it seems to work better cant grab cold air.I have ordered a VARA-RAM cold air intake system i am still waiting to use this.Can some one give me advise for improvement, an has some one used a ram air system and proven on track.Any advise on my combo will be helpfull.Thankyou.

42 degrees advance seems a bit high. Is that figure purely mechanical with vacume disconnected?

Are they 290 heads?

An open carb spacer might give it more topend and allow a higher shift point.

Airclaeners are good for preventing fires.

Lower gearing, more stall and better tyres will make it go faster without getting into the motor.

Are you still using the stock LS5 camshaft?

Yes standard replacement ls5 .510 lift, 218/218. 112 lob sep

Like Munro said..and put the car on a diet if you can.

uncap the headers, 38* total timing, 3.73 rear gears.

uncap the headers, 38* total timing, 3.73 rear gears.
Thanks, i want to retain 3.31 gears for freeway top end 140mph+ try and run in the 12sec with this setup.Use the cold air ram and re tune i will inform on progress.