Yellow03Z06

I just picked up an LS2 block for my build. My next step is gathering a few more parts before I drop everything off at RPM Motors.

I originally planned to keep the stock crank and use my LS6 heads and intake but I don't want to regret not going to a 402.

Current mods are ECS Novi 2000, 8 rib, ECS blower cam, 1 3/4 headers, meth, ACT twin clutch, built rear and trans. I will need a fuel system too.

I know it will make plenty of power either way and that the 243 heads and 1 3/4 headers aren't optimal but should I go with a 4" crank or stay stock stroke? The car is a weekend toy that I occasionally drag and some 1/2 mile racing. I'd like to take it to Mojave Mile sometime too.

Opinions appreciated!

MVP'S ZO6

402.

Arun@Dasilvamotorsports

FWIW, I'm going from a 402 to a 365, and I am confident that I will be faster as well.

p1bz

Hands down, the shorter stroke, no comparison.

longrodlx

364

breecher_7

Last 364 I did went north of 900 whp with ease. It does lack the grunt of a 4.0" stroke though.

joshtownsend

i'll keep that in mind if i enter a tractor pulling contest with the vette...

Yellow03Z06

Lol!

Pmed Charlie today and he recommends the
Stock stroke so I'm going with that.

winters97gt

402.

4DRUSH

Stock crank, use saved stroker crank money for heads.

MVP'S ZO6

If I were a betting man I'd say that there a few other major reasons that your going to be faster than you were before. decrease in stroke being the least effective of your faster times that you should run.

ajrothm

The reason I decided to go 402 was, although most people say the stock crank is good for 1000hp, I was factoring in the strain on the crank from the blower at full load, not to mention mine is an f1r which is known to be very hard to turn...that's likely another 50-60hp worth of strain on the crank and I just wasn't going to take that chance on a $10k motor.. My luck is the one part I don't change is the one that will fail...so for $900 I decided to go to a forged crank for piece of mind...

And since it costs exactly the same to buy a forged 3.62 or 4.0" crank, it seemed to me to have NO down side to going to the 4.0" crank..

Now if I was gonna spin it to 7500 or something I would go stock stroke for sure but.. I just don't see a down side to more cubes if staying at 7k rpms or less..

Plus I figured if I ever pulled the blower off, it would still run decent NA...

Quickshift_C5

Any particular reason people are recommending stock stroke compared to the 402?

mchicia1

Def 364. No need to spend the extra $1300 on a crank plus more $ for the machine work if going boost.

sabastian458

From what I found it seems that some say that the piston can rock slightly with a 402/408 setup combined with boost. I could not get 100% certainty with that though.

I decided to go with the stock 365ci over a 402ci, 8.8:1-9.1:1 compression and lots of boost. I figure it will be fast enough.

breecher_7

On the street you will notice a big difference. 364ci @ 19psi with a YSI still felt super lazy... If we would have went -.200" on the pulley perhaps it would have woken up a bit more. But it felt almost slow even at 900+whp.

The 364 is most likely a better motor for a track car, but for the street, the 402 would be more fun.

Thats my opinion atleast.

undertaker

if it were me, with a centrifugal I'd rather have a shorter stroke motor thats higher at higher rpms.

at least in a light weight vette

not to mention the cost savings that can get put elsewhere sticking with a stock crank

slow ride

I'd be curious to the gains of doing a solid roller setup at these levels to get all the rpm/powerband you can out of it. At that point you wouldn't want the plastic long runner intakes, etc so it could really bring up the powerband.

joshtownsend

What was the cam..lsa ect??

95vettski

Or a flip drive!