I wonder how high you could build a Vortec 4.8 to rev

"JayZAyEighty thinks C4+3=C7" (jayzayeighty)
11/23/2014 at 20:46 • Filed to: None

The idea of a small displacement LS with good top end power that likes to rev in the C4 makes me happy. I know an aluminum 5.3 would be lighter and torquier, but I'd want more of a screamer that's best at redline.

DISCUSSION (38)

PS9 > JayZAyEighty thinks C4+3=C7
11/23/2014 at 20:51

Revs v. Displacement?

Kinja'd!!!

dogisbadob > JayZAyEighty thinks C4+3=C7
11/23/2014 at 20:52

They should tack on 2 cylinders to the HF V6.

JayZAyEighty thinks C4+3=C7 > PS9
11/23/2014 at 20:53

Haha the way the LS7 combines the two is almost as impressive as its cost of ~50 times what you'd buy a decent 4.8 for at a junk yard!

Jordan and the Slowrunner, Boomer Intensifies > JayZAyEighty thinks C4+3=C7
11/23/2014 at 20:53

I want to say someone has destroked a 5.3 using 4.8 parts for an engine building competition, but I can't find anything.

PS9 > JayZAyEighty thinks C4+3=C7
11/23/2014 at 20:55

Worth it.

#MoneyAintShit
#LiveWhileYouAreAliveBro

JayZAyEighty thinks C4+3=C7 > Jordan and the Slowrunner, Boomer Intensifies
11/23/2014 at 20:55

That sounds familiar actually! I'm going to see if I can dig anything up.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:02

I remember reading a magazine article a couple years ago. They took a junkyard 4.8, put some TFS heads, FAST intake, and a couple other things. Made bit over 500 hp at 7k I think.

GTRZILLAR32-Now saving for Godzilla and a condo > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:02

There is a de-stroker kit for my S54, the redline is apparently like 10,000rpm. I hope you follow through because I'm kinda sick of seeing LS7's in everything.

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/23/2014 at 21:05

ooh, that's basically what I'd consider if/when my L98 starts to falter. Torque is nice to have, but I'd definitely sacrifice some to enjoy a better top end.

V8Demon - Prefers Autos for drag racing. Fite me! > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:08

Google searching turns up this: http://www.superchevy.com/how-to/engines…

JayZAyEighty thinks C4+3=C7 > GTRZILLAR32-Now saving for Godzilla and a condo
11/23/2014 at 21:09

Wow, that sounds incredible. And I don't have the money or a good reason to do a swap now, but my L98 has quite a few miles on it and I wouldn't be averse to a 4.8 + ZF6. I love the 4+3 but a 7-8k RPM would not suit the transmission. I'd probably end up keeping things original, but the 4.8 would be a strong consideration.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:11

Well, to be honest with you, youll give up a decent amount of torque, but the hp difference won't be much. You'll just have to spin the smaller motor higher to achieve similar results.

Here have a look.

http://www.superchevy.com/how-to/engines…

JayZAyEighty thinks C4+3=C7 > V8Demon - Prefers Autos for drag racing. Fite me!
11/23/2014 at 21:14

I actually remember looking through that article a while back but I wasn't really interested in such a build. Thanks!

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/23/2014 at 21:20

Honestly what I'd like most is a rev-happy motor. I'd rather have the ability to really wind out the engine to get every last bit of power than rely on low end grunt as I do now. An L33 with a 4.8 crank would probably be the most fun option.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:29

Another option(more expensive).

LS7 block, 4.125 bore

4.8 crankshaft, 3.268 stroke.

Comes out to 5.7big bore, short stroke.

Top it off with some nice 245-255cc TFSheads, jesel valvetrain, ITB intake setup.

Rev it to the moon.

The engine in the COPO Camaros is similar to this, however with a big ole Whipple on top.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:37

No argument there man. My uncle had a TPI C4 a couple years back. And while the narrow cross section/super long runner lenght intake made stump pulling torque. It was done by 4500rpm. So I can see why you want to watch the tach climb for a change. An aluminum 4.8, with even just a cam, LS6 intake and aluminum flywheel in your C4 would have you taching it up well north of 450 HP easy.

V8Demon - Prefers Autos for drag racing. Fite me! > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:37

No sweat. FWIW a guy I went drag racing with a few times grabbed a 6.0 out of a Caddy Escalade and stabbed it into a stripped out 4th gen F-body and did a camshaft/valvetrain upgrade on it. 10.3's all day long. Can't remember what transmission was in it, but it did have a ratchet style shifter. He was pulling gears HARD and the thing would pull the wheels every time. Left dead arrow straight too.

Kinja'd!!!

crowmolly > V8Demon - Prefers Autos for drag racing. Fite me!
11/23/2014 at 21:38

DAT BGC. Nice.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 21:41

All this GT350 and flat plane crank talk reminded me if this.

Lingenfelter 358 CID LSx Flat Plane Crank Engine:

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/23/2014 at 21:50

Definitely! Merging from a stop is so much fun—with the kind of low end torque you get from the TPI small block it feels like you might be in something with just insane power. And they sound great, even at 3,500 RPM. But with such a great chassis and firm suspension, I feel like there would be wasted potential on the track. What really changed my mind about torque vs revs is actually my mom's NA BMW, which is a joy to take over 6,000 RPMs. I've planned a major build for that car assuming I have a decent job by the time she's ready to sell it (if I'd get a good deal), but for now I'm just trying to keep up with a 30 year old Corvette's expenses. The engine you just described would be the best of the rawness of a pushrod V8 and a the revviness of a small displacement engine that breathes well.

JayZAyEighty thinks C4+3=C7 > V8Demon - Prefers Autos for drag racing. Fite me!
11/23/2014 at 21:51

That sounds insane. I'd love to see that car in action. And the dark green looks fantastic on that WS6...

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/23/2014 at 21:54

That's pure sex. Lingenfelter has really crazy ideas but more than enough money to fund them.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/23/2014 at 22:01

No doubt! Some crazy stuff comes out of that shop. Big $$ too.

jdrgoat - Ponticrack? > JayZAyEighty thinks C4+3=C7
11/23/2014 at 22:13

"Most fun option" would be a 4.065" bore block (6.2L) and top end with a 4.8L crank. The bigger bore and valves can breathe in the higher RPMs better. Much less valve shrouding with a bigger bore. And that way you can still have more torque than a 4.8L would have throughout the whole rev range, also. About 339ci or 5.5L if you don't want to do the math.

jdrgoat - Ponticrack? > JayZAyEighty thinks C4+3=C7
11/23/2014 at 22:17

Wish I could find the youtube link for the video I took this shot from.

Kinja'd!!!

Old-Busted-Hotness > JayZAyEighty thinks C4+3=C7
11/24/2014 at 07:31

Bear in mind that the 4.8 won't take an overbore. The block castings are too thin. Max oversize is .004 (barely a hone). So you better find a super-low-mileage example at the junkyard.

briannutter1 > JayZAyEighty thinks C4+3=C7
11/24/2014 at 10:43

The problem being is the 4.8 is the small bore...shrouding the small 1.890 valves in the heads...so they don't flow. the LS3 is 4.065 bore with 2.16" intake valve with a 3.622 stroke versus the 3.268" stroke in the 4.8. You could fit the short stroke in that block to net a 5.6L...but the issue becomes valvetrain stability past 7200rpm or so with hydraulic roller plus the long runner intake isn't tuned for the high rpm....meaning it never fulfills it's RPM/HP promise unless your running in a form or racing where smaller displacement nets you a weight break or LSR racing with it's multiple class levels. The 388ci (6.4 liter for communists) LS7 4.125 bore with 3.622 "LS1,2,3,6" stroke is semi popular because you can run the even higher flowing ls7 heads. The 5.3 is kind of nice because it can be bored to LS1 bore size...although I'd wonder if ls1's even cost that much money these days.

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/25/2014 at 19:56

His collection is simply unbelievable. He even has the Callaway SledgeHammer which is still the fastest Corvette to this day. I can't say I'll be happy when the record is broken, because it shares so much with my car.

JayZAyEighty thinks C4+3=C7 > jdrgoat - Ponticrack?
11/25/2014 at 19:57

Thanks for the info! At this point, an engine swap would be done purely because it would be as cheap as rebuilding the original motor, but a bigger bore motor with a 4.8 crank would be so awesome.

JayZAyEighty thinks C4+3=C7 > jdrgoat - Ponticrack?
11/25/2014 at 20:00

Could be this one. Too many C6 acceleration videos to be sure haha

https://m.youtube.com/watch?v=rAjJrX…

JayZAyEighty thinks C4+3=C7 > briannutter1
11/25/2014 at 20:02

Thanks for the info! The deciding factor in an engine swap in the near future would be cost, but I think the L98 will probably run for as long as I need it to. Sounds a bit off most of the time, but I don't have the knowledge to diagnose it with.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/25/2014 at 20:19

Yeah, I still cant believe they did that in the 80s. And with a modified TPI motor at that

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/25/2014 at 20:27

It's very impressive for the time. And people at the test track literally abandoned Callaway in tuning at the track once they announced that they were gunning for 250. People trash both the L98 and 4+3, but they got the corvette banned from showroom stock racing against 911s and 328s and the like because they're actually quite potent. Then there's the fact that behind the people whining about overdrive failures after abuse/neglect, the transmission (Super T-10) is based on Nascar modified T-10s and was able to accept freight 850whp for 250MPH runs.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/25/2014 at 20:33

Ive never actually driven a 4+3 Corvette. Hear great things about them though.

Black widow is another favorite from that era. 475 hp.

Kinja'd!!!

JayZAyEighty thinks C4+3=C7 > DoYouEvenShift
11/25/2014 at 20:49

I think they're a ton of fun—long, heavy throws that feel great when you get right—but most people preach about the ZF6's ease of use. I daily drive a 4+3 with a worn clutch, so I don't exactly see their point. The black widow is an awesome one! Callaway managed to squeeze up to 500 NA horses out of the LT5 as well. The ZR2 "big doggie" is another favorite. It's a one-off prototype that used a 454 to deliver LT5 performance with pushrod simplicity and sold for $65,000 at auction in 2009. Seems like steal, especially considering that's what a nice C3 LT1 will easily eclipse.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7
11/25/2014 at 21:10

Ive driven a few ZF LT1s, nice units. However, I prefer my T56, feels more solid and gives you that click when you engage a gear.

Kinja'd!!!

Oh yes! I went there!

jdrgoat - Ponticrack? > JayZAyEighty thinks C4+3=C7
11/25/2014 at 22:21

The one I had was a C5 (not even a Z06, going by the gauges), and it was on a drag strip. It's just hard to find videos where the tach goes to 7500 in an LS1 on YouTube! I wish I had saved the link. As you'd expect, it was a pretty good pass time, too.

JayZAyEighty thinks C4+3=C7 > jdrgoat - Ponticrack?
11/26/2014 at 14:36

Oh yeah, that's a C5 gauge cluster. And that must've been an insane sound! I can't find it anywhere on YouTube with my phone, but it might turn something up to drag and drop the screenshot onto google images to see if a thumbnail comes up.