383lt1ta

iTrader: (2)

I am thinking of going to BBC w/400turbo.

MY 383(not sure what assembly, but has hyperutectic pistons 12.5 :1), ported heads, xfi280 cam, ltcc w/ msd coils and opti, 30lb injectors, long tubes, dual flowmasters, everything else for lt1, and tunercats programs(Ed Wright tunes).

4l60e five pinion planteries, race clutches, carbon kevlar sun shell, Rossler valve body and pro trans brake, and vigilante convertor multi disc rebuilt with carbon kevlar clutch packs 1800 off foot brake 3600 off brake.

Car went 11.29 with 100 shot off the brake.

I'm trying to figure out what direction want to go and sure what I get get out of this stuff. I didn't go into great detail on motor and and trans to keep this semi short, but they have the supporting parts. Thanks for input.

MEAN LT1

iTrader: (2)

If it were me. I would invest in some decent forged pistons keeping the compresseion were it is. I also would get a matched cam to with your heads. Who ported your heads and what do they flow?

Snkebait95

iTrader: (16)

As he said ^... And if you want the true potential out of the 383 you need to go solid roller.

gregrob

iTrader: (8)

What?

96capricemgr

iTrader: (1)

A GOOD hydraulic 383 f-body can be faster NA than your car is on the jug.

joelster

You have a LOT of sorting out to do with your current combo. That car should be well into the 10's. What track did you race at? Maybe you are in high elevation like Denver or something. My stock shortblock car with 9.2-1 compression ran 11.11 n/a on pump gas. There are many others that have been into the 10's with the factory 350 shortblock. That cam is pretty mild for a 383, I ran the XFI468 on my 350. What weight is the car?

Puck

iTrader: (17)

Who did your heads, and how ported are they? What were your 60' times? Trap speed? What is your A/F?

A 383 needs a GOOD cylinder head, but could be running around those times NA. If they are good heads, I would have whoever ported them spec a cam for you. Then look at your 60', to see if better suspension will get you closer to where you should be.

Was your tune mail order? 30#s seem small for a 383, are you sure it gets enough fuel on the top end?

vtec

iTrader: (1)

you can go 9's with hyperutectic pistons and a hydro roller with nitrous.

SS MPSTR

iTrader: (1)

Very true.

quik95lt1

iTrader: (7)

and even faster with more agressive valvetrain

never underestimate a well built small block

96capricemgr

iTrader: (1)

Can I ask what this is?
I also didn't think anyone who knew what they were doing was using Kevlar in these.

quik95lt1

iTrader: (7)

i missed that one lol..........yea thats interesting carbon kevlar sunshell lol

RamAir95TA

iTrader: (2)

Some super awful advice/info in this thread.

There is no reason a typical hydraulic roller 383 can't run 10s N/A. But what do I know?

1badzee

iTrader: (12)

My advice to the OP. Tear it down, get a good piston and call Advanced Induction or Lloyd Elliot. Three cars in this thread are a testament to AI's work.

383lt1ta

iTrader: (2)

Thanks for the advice.

The heads were ported by a local builder and not flowed.

The transmission shell is what I was told, so dont know. They do it to pulling truck convertors is all I know.

My trap speed was only 113, I was in a grudge race and let out early not thinking it was my best pass. My 60' on that pass was 1.53, with 1.46 being my best.

I not have afr gauge yet, but the plugs looked good.

The tunes are Ed wright mail order.

I have not weighed the car, its full weight plus 9", sfc, umi tunnel mount, bmr arb, lca which all weigh more than there stock counter parts. So its up there.

There's one guy around here thats good at tuning but he does want to do it anymore, I have one other place to go, but I'm skeptical. I'm just not good at tuning with lt1 software. I'm on the fence on going more race, removing ac/heat, severe diet. I only drove the car 2100 mile this year. If I kept the lt1 what would be some recommendations, I have to go low 10 to keep up with competition. Thanks again.

vtec

iTrader: (1)

my advice is to leave the engine alone and start working on the car.

gregrob

iTrader: (8)

What vtec said. Along with getting a good topend on there.

Local ported heads are rarely done properly