domestic disturbance

iTrader: (35)

Im about to start dialing my car in, jw how hard you guys are turning your 383 lt1
i can post mods if needed.....

96capricemgr

iTrader: (1)

How high guys spin motors will depend largely on the heads and cam/valvetrain.

Share a little info about your setup and we can get you in the ballpark of where to start shifting it.

Tapout911

iTrader: (9)

Yea and remember your stuck at 7k-7200 on a stock PCM anyway.

domestic disturbance

iTrader: (35)

im running lt4 le3 heads, with cc306 cam that had to be grinded on to clear the rods, not really exactly sure what springs, its been so long ago that i started the build, lt4 port matched intake, forged shortblock *scat parts* all is studded.... thats the basics, also computer rev limiter is at 7250, i am gona adjust it with msd digi 6!

vtec

iTrader: (1)

a forged 383 shortblock should be good for 8k+ at this power level. the more important factor at that point would be the valvetrain/heads/cam/intake. but since the LT1 pcm will never get there, i wouldnt worry about it.

domestic disturbance

iTrader: (35)

so you would u would turn it 7200 safely?

vtec

iTrader: (1)

heck yea, ive had my stock shortblock on the 7k limiter quite a few times. and my stock shortblock LS1 car has seen 7200 several times.

fex77k

iTrader: (2)

I've only ran mine up to 6500, but I know it can do more.

z28racerlt1

I don't know if the cam shaft needs to be spun that high. I ran a cam slightly larger than a 306 and shifted it at 6800. It ran 10.68 @ 126. I would start lower and raise it as the car needs it. If the car doesn't improve with ET then there is no need to spin it higher. Your just wearing those valve springs down faster.

ken

vtec

iTrader: (1)

oh yea, cam is too small. lol

domestic disturbance

iTrader: (35)

okie doke, ill def let you guys know, i guess ill start around 6600-6700

Wicked94Z

iTrader: (26)

the 112 lsa and big split on the cc306 will let you carry the rpms pretty far past peak, but the same factors dont make much midrange either. i think 6600 is a good starting point for you, how much compression are you running?

robsquikz28

iTrader: (246)

6800 tops.

domestic disturbance

iTrader: (35)

thanks again guys the motor is around 12 and half to 1 compression, but thats would my machine shop said, but my tuner said it didnt feel like that much...

Wicked94Z

iTrader: (26)

that much compression, and those heads... i'd run a different cam, but that's just me.

domestic disturbance

iTrader: (35)

anybody have any recomendations on what cam they would run, Kinda learing on swapping cams bc it was coming verry close to the rods, Is there a cam you all suggest go with that i wouldnt have to pull motor and check clearance????

Wicked94Z

iTrader: (26)

transmission type/stall, rear gear, car weight?

domestic disturbance

iTrader: (35)

rossler th350 reverse manuel vb, transbrake, gear rear for 94 vert, car is still stock weight...... maybey a few pounds leighter.....
BTW thanks for the help!

Wicked94Z

iTrader: (26)

put a real gear in that thing like a 4.11 and you could run something around 238/246 on a 108+3 which would run great with a 4000 stall. Take weight out of the car and you could run about 6 degrees bigger all around. Im a fan of bigger cams though...

domestic disturbance

iTrader: (35)

im kind of thinking that 4.11's will kill me with th350 though...