Mapplin

I built a lq9 with 243 shaved .030 heads and .010 on the deck and .020 pistons the camshaft is a tsp 228/232-600/600 lift its n/a with a 780 pro system carb holley intake and a msd6014 trying to find the timing curve and how much hp it should have im going to test and tune the car at the track and what spark plugs should i run the car is a 1984 z28 with 4.56 gears and a 350 trans 3500 stall

Kawboom

That ignition system comes with a manifold pressure sensor, so you can tune it a bit like an EFI system, so looking online for a similar engines timing curve could be a good start. If you have good piston quench height I would be a little surprised if you needed more than 24 degrees of timing at WOT.

jetech

Hey Mapplin ! Your engine combo is very similar to mine. I have 3.42's and a 4l60e, Yank PA3400 in a '71 Camaro RS. I haven't got it to the track yet. Keep us posted on how the test and tune goes. I'm very interested! Wow 4.56's

Mapplin

Well just got back from the track and the car did well but for some improvement ran 4 passes .ran a 7.24 at 98 mph 7.36at 97 mph 7.51 at 94 mph and the last run I blow the tires off and almost hit the wall but other than that it did very well my 60 foot was 1.6 to 1.8 I do have 295/55/15 Mt drag radials still wasn’t able to adjust the timing on my msd6014 so I put it on ls1HO didn’t have a hotspot for the laptop 😒

jetech

Wow! great job 11 second club the first time out

jetech

Mapplin do you know your engine's static cr ?

Mapplin

Thanks I’m still working on adjusting the timing and maybe get under 7.0and I do believe my static cr is around 4.5 to 4.6

jetech

cr maybe 11.0 or 11.5 ? Mine is almost 11.5

Mapplin

My heads are shaved .030 and the blocks deck is also shaved .010 the machine shop said around 12.1