FRANZ

Is the 383 a very good way to go????
A little cheaper than the 427.
How mutch more power would it make just from
the displacement alone?

Sounds like a really long stroke for such a small bore.

Thanks.

ls1wannabe

iTrader: (2)

its certainly not a bad way to go from what i have seen most 383 are tq monsters so not a bad street or strip car but why stop at 383 when you can go with a 402

ls1wannabe

iTrader: (2)

and for the power question i would say it depends on the supporting mods so with what you have i would say it would be rather easy to push 435 to 460 rwhp

FRANZ

Say a good set of ported heads and a decent cam.

TAQuickness

iTrader: (28)

I love my 383. If it had anymore jiggawatts, it would be difficult to drive on the street

SAM98WS6

with AFRs (good heads) 500rwhp is attainable...but as cheap as LS2 strokers are that might be a little better way to go and get ~550rwhp... honestly 383 LS1s are obsolete...unfortunately. When I did mine a 427 was almost $3k more...out of my price range.

check out www.rapidmotorsports.com and some of the other sponsor prices...

JakeFusion

iTrader: (7)

383 is still cheaper than a 402, because you can use your existing block with the 383 vs buying an LS2 block. Of course, you could sell off your LS1 block, but you won't make up enough of the cost delta to buy the LS2 outright.

As far as performance goes, I've only seen two 402/408s break 550rwhp. Most of the respectable ones are in the 520-540 rwhp area with 460-480 torque, which is still quite good. However, if you run the same components, cam and heads on the 383 you'll be at 500-520 with similar torque. The bore on a 402 is simply not big enough to give a huge advantage, and the displacement difference is not that great. If a head/cam setup makes 500rwhp in a 346, it will do the same in a 383 and a 402, just with more torque in the strokers and a lower peak HP RPM.

The only real advantage is that an LS2/LQ9 blocked stroker can use a bigger cam to make more power without sacrificing drivability and thus pushing the peak HP RPM up to make more power on the top end.

I'm still a fan of the short stroke, huge bore 393s and such. With the right setup they will make as much torque as the 383/402 and more HP, higher in the RPM range. The bore on that is 4.125 which is a big enough increase to take advantage of some of the new monster heads out there.

mikeyZ06

Go with the LS2/402 !!! I bought mine complete 90mm tb and LSX down to oil pan for $13k, installation and tuning took one week and $2300, sold my old LS6 motor from my 01 Z06 385hp on eBay for $3800 in two days, net cost $14,500. That's about $1,000 cheaper than a very reputable builder in here wanted to turn my LS6 into a 383 for. Instead I got 20 more cubes, more power, and was without my car for one week instead of four to six. No brainer for me.

TWINK

iTrader: (10)

Go Big Franz

ATLHwyRacer

iTrader: (5)

I hope this isnt 2 far off topic, but Ive always wondered whats the differance between a Solid roller and Hydrolic setup? The main differance I've seen is guys with these 383, 402..etc have these HUGE cams (well huge like 255/255 260++ cams) where the 346ci ive seen biggest of 240's. So My question, what does it take to switch to a solid roller setup and is it worth it on a 383?

lsevenl

iTrader: (5)

I was looking into this as well. I'm running an F13 with TEA stg 2.5 heads. I'm thinking of going with a different shortblock eventually either for spray or turbo. I saw a few threads not long ago about MTIs 422 setup or going to the 427. I plan to maintain some driveability and probably won't use much larger than a 240/240 cam. Can anyone speculate what kind of #s i'd be looking at if I went with a 427 and used the same heads I have now? Currently I make 443/397 with the F13 and TEA heads.

LSUxBlake

iTrader: (3)

If you go with a 427, you can run a bigger cam than 240/240 and have great streetability. In fact, that 240/240 will probably idle in a 427 very similarly to a F13 in a 346. As far as power, you could be well into the 535-550rwhp range with a streetable cam with 427. The biggest difference would be your torque though

lsevenl

iTrader: (5)

That's pretty much the goal: ~550rwhp N/A. Now I just gotta pay off some bills first

01KY

Hey how much do you want for you stock/ported heads and LS6 Cam ?

Super Slow SS

iTrader: (9)

MikeyZ06 WTF mate? 13G for the ls2 think you proly could have found a better deal ... and whats with the big bores? I see that most people are reccomending the 402/408 i've never seen eather of the 2 make more power or be as reliable on the street as the 383, given "no replcement for dispacement" but if your gunna go that big the only thing worth the money is a 427. My local engine builder and I have had neumorous talks about power for money motors with generally the same conclusion ... worked stock heads moderate cam 383 Get 550-600 WHP @ 10.8 - 11.1 comp. still save plenty of room for shot. he's built 2 so far with 20-30K miles on them mine will be the third in a few mo. for 5500-6000K (not including headers, intake, TB, and tune)

LSUxBlake

iTrader: (3)

You should do a search.

1) I haven't ever seen a 383 (hyd roller) make 550-600rwhp naturally aspirated. "worked stock heads moderate cam 10.8-11.1 compression" = no way it'll make 550rwhp, plain and simple.
2) There are PLENTY 402's and 408's on this board making a ton of power, more than 383's, and a few well into the 550rwhp range, with Vince dynoing mid 560's. And I don't understand your statement about why a big bore LS2 or iron 408 wouldn't be as reliable on the street as a 383.....

David Gordon

iTrader: (1)

Use your block and build a all stroke 395 like mine. Mine is streetable and made 489 rwhp and 470 rwtq with a small cam. I have heard of guys going with a 250ish cam and getting more power. I have a 240/244 cam, I have heard of guys running these in a 346. I have 5k miles with alot of 1/4 passes and NO problems.

SS1875

iTrader: (34)

I like my LPE 383 alot, I will be posting some new numbers in my sinature soon. I had my 90mm intake port matched to my heads and also had the ports on my heads hand blended. I should see another 7-10 cfm and 500 or better RWHP.