car5car

Is engine in new Corvettes 383? 6.2L is 383, right?
Does it have same bore size and longer stroke?
Manufacturing cost of 383 should be the same as 350, just different crank and pistons?

Pwnage1337

Isn't it just the ZR1 that is 6.2L? Supercharged though

BADDUCK

They stole it from Dodge

redrose

Gm's new stuff used in production vehicles is all small bore/long stroke for emissions...they do the 'hot rod' stuff cause they make more profit on a crate motor than they do on a cobalt, and hard-core gearheads want the ol' big bore/short stroke for power...s.s., not the same

JackDidley

I built my first 383 stroker in the 80s. Not an original idea then. Stroker smallblocks have been around a long time.

aboatguy

Seems like LS3 is not a stroker it has same stroke as LS2 with a bigger bore....

LS3 specs
6.2 Liters
Bore 103.25 mm diameter = 4.06"?
Stroke 92.0mm = 3.62" ?

pologreen1

tpi 421 vette

The LS3 6.2L in 2008 and up Corvette's is a 376 ci engine. The LS family of engines has nothing in common with our engines.

88BlackZ-51

isn't that the truth.

NXS

steal the 383 stroker? they were making it easy on us when they built the 400 sbc...

as they made new shorter rods.. that were the PERFECT length, 5.585" to use the 400 crank and rods in a 350 block with 350 pistons... just everybody wants the "long rod" and buys aftermarket "stroker" pistons....

3.48 = 350 stroke
5.7 = 350 rod
3.75 = 400 stroke
5.565 = 400 rod
1.56 = 350 piston pin height
so

3.48 / 2 = 1.74 + 5.7 = 7.44 + 1.56 = 9.00
3.75 / 2 = 1.875 + 5.565 = 7.44 + 1.56 = 9.00

man, those chevy engineers were smart and thinking ahead !

syco_cop

Can you please explain what your math is referring to, I'm sure it makes sense to most on the forum, but some of us drink Admiral Nelsons (cheaper Capt. Morgans, but last I knew Adm. was higher then Capt.???, bong hits also don't help.) Is this refering to rod/stroke ratio? I just don't get 1.74 vs. 1.875 variables. Thanks for your patients.

cv67

Keep smokin' & check back tomorrow when your ship is dry docked

Joe C

and now i'm hearing about a high-revving 5.5L (330-something cu.in.) for the new or next generation corvette. has something to do with GT2 racing...

90qzrblu

The numbers in question are just half the stroke of the crank.

cv67

Guys have been turning down cranks and doing strokers of almost every brand for decades nothing new. Back then there werent all the aftermarket co.s there are now they had to get creative.

Beach Bum

Here are some common configurations of Corvette motors:

Gen 1 sbc

4.00" bore x 3.00 stroke = 302 chevrolet motor.... most think of a 302 as a Ford only motor, but GM had one - short stroke, equal high winder if they wanted too......

4.00" bore x 3.25" stroke = 327 cubic inches

4.00" bore x 3.48" stroke = good ole 350 motor prevelant for a longtime - In reality, the common 350 ci motor is in fact a stroker motor... when compared to its predecessors.

4.03" bore x 3.75" stroke = common .030" overbore during rebuild with addition of 3.75" stroker crank equals well known 383

4.125" bore x 3.75" stroke = 400 cubic inch GM engine common back in the 70's

4.155" bore x 3.75" stroke = 406 cubic inch motor common to hotrodders after .030 bore after rebuild.

4.155 bore x 4.00 stroke = 434 cubic inch motor..... common aftermarket build typically using aftermarket block

Many variations of the above giving everything from a 415 ci to 440 ci and even beyond nowadays..... some use 3.875" stroke for 420-422 and of course different bores.... with 4.185" typically the absolute maximum and only using an aftermarket block for that much bore.

LSx series motors:

LS1 = 3.90" bore x 3.62 stroke = 346 ci (small bore, but a mini-stroke crank when compared to gen1 motors)

LS2 = 4.00 bore x 3.62 stroke = 364 ci (back to conventional 4.00 bore that GM likes, but with the mini-stroker crank)

LS3 = 4.06 bore x 3.62 stroke = 376 ci (like a 60 overbore of a gen1 with the mini-stroker crank.... this is a damn good motor.... valves are unshrouded well even for aftermarket big valve cylinder heads and the additional stroke is a noticable difference)

LS7 = 4.125" bore x 4.00 stroke = 427 ci (This is common to a lot of gen 1 aftermarket builds that use the same standard bore of the aftermarket block with the 4" stroke..... this is a "great" motor to start out with in my opinion)

((As a note, I believe the ZR-1 638 HP motor is an LS3 based motor but with a Supercharger added))

GM has been experimenting with bore and stroke combinations since the beginning of time..... as seen by motors such as 283, gm 302, 305, 307, 327, 350 & 400.

Give the hotrodder credit for actually making a lot of the unique combinations we see happen..... if they start doing it, and they did..... somebody recognizes it and manufacturers an off the shelf aftermarket solution as we have seen through the years.

I think hotrodding has been accelerated dramatically 100% due to the Internet.... the sharing of information and knowledge has fastforwarded the quest for more power by 10x fold......the improvements of what the aftermarket companies put out nowadays reflect this..... cylinder heads, valvetrain, cam lobes have all made huge steps forward just in the last 10 years...... what was fast yesterday, is pokey slow today.