180ls1

iTrader: (4)

that is not my arguement and i agree with your statements about the 370 and the 383 in this case. maybe we just cant understand each other.

z28mccrory

iTrader: (7)

So what is your argument. You keep saying "if properly setup, etc the 383 would make more power"... but there is no head/cam combination that exists that would make more power on the 383 than it would on the 370 (assuming the bores we are talking about)

Im not trying to be a dick... and the only reason im even still posting is because im browsing the site and keep seeing this thread pop up, lol.... but i honestly think that you aren't 100% seeing what me... and the guys from TSP, SDPC... etc... are saying. Perhaps we dont see what you are actually trying to say either... but with the argument at hand... the 383 would never win. Thats why i think you have to not understand what is being said.

ChiTownHustler

iTrader: (3)

Wow built another engine today while you guys argued over nothing. BTW is was a stock stroke LS2 based block. 4.005" x 3.622" and I am sure it will run train on just about any 383 out there with similar head and cam combos

z28mccrory

iTrader: (7)

Nuff said

99 Black Bird T/A

iTrader: (4)

4.030 - 3.905 = .125

.125 is exactly 1/8"

z28mccrory

iTrader: (7)

Yeah my bad... just got so wrapped up in the other argument that i wasn't thinking. Just had 4" vs 3.9" in my head.

180ls1

iTrader: (4)

i was never said you had to limit the bore size to 3.905 in the 383 because that is not an optimal setup for a 383. i know that the op would be using that bore but i was just trying to clear up what blancoss was getting at.

gallardo259

Very interesting thread.

So a 370 can make more power than a 383 because of maximum valve size due to bore...all thru the rpm range? more hp and torque? why build a 383 then? my plan was to build a 383, but now maybe not. for a weekend street car, which would be better?

brad8266

iTrader: (23)

Um, you do have to limit the bore to 3.905, you cant bore an LS1 block at all. All you can do is hone it out to 3.905, no bigger, and that would give you a 347 CI motor with a stock stroke so the displacement increase just 1 CI over stock.. All you can do with an LS1 is stroke it out. No offense but you really need to get your facts straight man, but I guess you can learn something from this thread.

180ls1

iTrader: (4)

correct, that is why you wold run a different block like an lq4 or ls2 or something of that nature.

brad8266

iTrader: (23)

You are all over the map 180.

gator's 99TA

iTrader: (2)

i see people are arguing so they can "get the last word in"

lol at this bullshit. lots of internet racers and builders and and hey, thats cool. enjoy the ride as they say.

guys with 200 bucks in bolts are arguing with real life engine builders. gotta love the intraweb!

180ls1

iTrader: (4)

the problem is that people dont read what i have said and assume i am saying something that i never did say.

bigfatls6

iTrader: (34)

I will have to agree with every one else on here. I would definetly go with the bigger bore 370 than the smaller bore 383. But if you wanted to spend the money on building a big bore 383 with a 4.030 bore even better but not probable. If you wee going to do that just go ahead and build a 408. I would definetly choose the 4.030 bore 370 though just for the fact I would have a lot better selction of heads to use even if I were using a stock casting when building the short block.

BigBronco

iTrader: (2)

This argument seriously did not happen did it? LOL

SynergyV8

iTrader: (1)

Less than 24 hours since I started this thread. 96 replies now. Holy hell. All over a simple misunderstanding.

Anyone have an answer to the post back on #49 .

david vericker

iTrader: (1)

I totally agree that the 370 CI motor based off of the LS2 block will support heads that will out flow (CFM) the 383 LS6 block.However,this is not a perfect world when it comes to the build of every 370 CI combo (set up).When push comes to shove there are numerous 383 combos (builds) that will be very competitive with the majority of 370 CI motors on the street/strip.

ChiTownHustler

iTrader: (3)

Not sure what you mean by optimized. First I would suggest ARP rod bolt for the factory rods. Then I would suggest a set of Mahle Motorsports pistons. They have sizes for stock rods in 4.000, 4.005, 4.010 & 4.030" with a stock 3.622" stroke crankshaft. I have a custom grind camshaft I like using just like everyone else. Depending on your budget an AFR 205, TFS 215, or a ported stock CNC casting which their a tons of good options out there. If you have any questions let me know

wht01ws6ta

iTrader: (45)

Well I must say this is a very informative thread...and a very entertaining one too! LMAO at TXZ28LS1 on the previous page asking about all the numbers and such with that much time on the board and that many posts and his mods in sig:

2002 Z/28- advanced auto parts lid, autozone longtube headers/ory, napa auto "X" cam, oreilly ported & polished heads, tornado fuel saver TB, target true duals, costco 9" cowlhood, tinted with black tape, level 6 tranny built by sam's club, AAFES drag welds, AAFES drag radials, walmart rollback roller rockers,..

That sh*t had me rolling once I noticed it!

/hijack

novaflash2002

iTrader: (51)

IMHO i have seen many more 370's rip the **** out of 383's. depending on the heads a l92 head would not fit the 383 but would fit the 370. also the engines would perform at different rpm. the 370 would make more top end power compared to the 383. the 383 would make more lower end tq. ask your builder at hke. the 370 has less rotating mass, because yes it does have a bigger piston, but thats aluminum. so it has less steel rotating on the crank which makes it lighter.