strokin93z

iTrader: (1)

Just wondering? i think i may go with a bigger displacement.

aggiez28

iTrader: (19)

I have seen people go 60 0ver. I would just go with the standard 30 though. better selection of off the shelf parts and itleaves you room for the future.

CRAZZ28

iTrader: (13)

396 is as big as i would go. You can go bigger but it starts getting hit and miss as far as reliability.

strokin93z

iTrader: (1)

hmm, 396 is a 4.030 with a 3.875 stroke. what length rods would be best? would you be able to daily drive a 396??

aggiez28

iTrader: (19)

all depends on how you set it up.

strokin93z

iTrader: (1)

hmm, looking around i cant seem to find a 3.875 crank. any directions?

aggiez28

iTrader: (19)

check out the list of site sponsers. lots of people make them

strokin93z

iTrader: (1)

alright, thanks a lot.

96capricemgr

iTrader: (1)

Boreing to get displacement would be a big mistake. Strength of the wall goes down FAST with very little gain in displacement.

It also is NOT displacement that makes power, it is airflow which is the job of the heads and cam, displacement will affect powerband and peak power rpm but not so much peak power number.

Someone on a racing forum I frequent put it well when he said "build the biggest engine your heads will support". I know that goes against everything newbs "know" about there being "no replacement for displacement" but it is true that cubes only work if there are heads to feed them.

slick1851

Displacement wise, ive scene a 402 on a few websites or somthing like that but never really see alot of LT1 people running somthing that big

Puck

iTrader: (17)

Biggest benefit of the big cube engines is the torque. Peak hp will not raise much, since power is made in the heads and cam. Most only go up to 396, but people have done over 400 - TPiS had a 409 package for some time. The benefit for the the extra price paid is debatable over a 383.

Block needs to go through thorough testing before going that big either way.

B4CZR2

If you want big cubes then you need to look to an LSx, since they can support well north of 500ci now!

burnzilla

iTrader: (3)

You could DD a 396 LT1.

How drivable it will be is determined more by the heads/cam setup, gearing, tuning and drivetrain then the power itself.

strokin93z

iTrader: (1)

i wasn't going to displacement only! i was looking for more torque, also i hope the heads im looking to invest in will flow enough. But we'll see... It's hard to decide between 383 or 396, for the price is it worth it?

GIZMO

iTrader: (8)

The bigger bore will probably perform better if you are running bigger than stock valves (regardless of stroke).

dhdenney

iTrader: (53)

Use a 5.85" rod for 396. You can do 6" but the piston ends up being a little small.

FASTFATBOY

iTrader: (23)

The rod ratio is kinda crappy on a 396, it is hard on the thrust side. Most 396 combo's have the oil ring in the wrist pin.

You can build enough power with a 383 to put you in the ditch on the street and it's life span is a good bit longer than a 396+ cube engine.

I would say a .040 overbore is max safely.


David

The Evil Genius

I wouldn't go more than 40 over.

GIZMO

iTrader: (8)

Please substantiate that statement. Have you had a bad experience with a larger than .040 bore with an LT1?

transam5.7lt1

iTrader: (18)

As you bore the engine you get closer to water pasages, engine reliability might be lost due to overheating.....