C5_Pete

iTrader: (8)

Where did you source your block and sleeves?

Did you buy a short block?

460”
480”

what is max cid for a standard height block?

Has anyone here built something big? How much power did you get out of it?

02EBC5Z06

iTrader: (1)

I think you will need a tall deck block for something that large.. You can make a 454 maxing out a set of darton MID sleeves at 4.2" bore and a 4.1 stroke. Not sure what Ryne Cunningham did with his old 480 block to make that.

02EBC5Z06

iTrader: (1)

NVM, his 478 was a tall deck (9.75") RHS block

It was 4.173 bore and 4.375 stroke.

Kingc8r

iTrader: (21)

There are companies that do 468ci out of sleeved 5.3 & LS3 blocks. Beyond that usually have to go tall deck from what I’ve seen.

Utinator

Yeah, I think 468 CID is the max for a stock, sleeved block. That's a 4.185 bore with a 4.250 stroke. That's about the max bore and stroke most sleeves can handle reliably.

Richard Holdener did lots of dyno testing on a 468 block. Check out his Youtube channel if you want an idea of how much power it can make. I know he went over 700hp with one set-up.

rkupon1

iTrader: (3)

Im 450ci, darton sleeved 5.3l block from Mast Motorsports. Made 800+hp on pumpgas, mast 285cc ls7 heads, efi, CCW crank, Hydraulic roller...
4.165"×4.125" iirc, bore n stroke

TrendSetter

I had a hpr 468 I daily drove for about 18 months. Great motor. Short deck. It was a darton sleeves ls7 block.

jayyyw

I have a sleeved LC9 and stayed near stock LS7 cubic inches. I haven't seen the larger CI stuff run much harder than a 427-430ci motor. Also leaves room for plenty of rebuilds. With the larger CI, you need better heads, bigger cam, bigger exhaust, etc... Especially if you're trying to go max effort.

I kind of got screwed with my block, so I won't recommend who I bought it from.

Thinking of selling your turbo stuff or building another car?

Steve - Race Eng

iTrader: (1)

Contact Horsepower Research for a large inch build with stock deck height. Erik Koenig has been building these large inch engines for years. He knows how to build the 468" engines so they last. I've sleeved his blocks for close to twenty years.

C5_Pete

iTrader: (8)

Now that Atco has closed, I’m pondering going back to an NA setup, but I want to run 8.50 index and brackets. I need about 900hp for that goal.

I’m going to run my current turbo combo this fall and likely most of next year until I truly make a decision about my direction.

The brain says BBC is the easy cheap way to go… but my heart says stay with the LS platform.

C5_Pete

iTrader: (8)

Thanks for the reply Steve. I was going to call you and ask, but I didn’t want to bother you for a simple question.

TrendSetter

Do you sell sleeved blocks outright or is a core needed to be sent to you?

NHRATA01

iTrader: (10)

I bought a TSP 454 about 5 years ago, 4.185x4.125, some details in the sig. The challenge with the big cubes of course is moving enough air. I'm running a non ported MSD, 1-7/8 primaries and Fbody style Y exhaust. It peaked at only around 6200 with a fairly large 4.2 cam so probably leaving a lot on the table if I could move enough air to peak a few hundred rpm higher. A high ram would surely help but I'm not looking to hack up my cowl, likewise 2" primaries with a dumped X but don't want the noise. The local guy who tuned it wasn't all that good either, been working with Pat G to fix a few things with the street tune so possible he may find a few more peak ponies if it were to go back on a dyno. But for a street car it's fun as hell with that torque and does what I want so no complaints.

C5_Pete

iTrader: (8)

Thanks again for the feedback, fellas.

This is an all out track only racecar. BBC is cheaper and makes more power…. But a high winding LS setup is really what I’d like.

I have the heads. LS7 style. Working with BTR for the valvetrain. Brian and I have done a lot over the years with my various camshafts.

jayyyw

Mine just made 757whp and 588wtq. Hydraulic roller. Definitely could touch 900hp with the right solid roller in it and a CID carb style intake. 428ci, CID heads, Holley Hi ram.

grinder11

iTrader: (1)

The early Darton sleeved LS1/LS6 could go to a 4.160" bore. The later Dartons could go to 4.200". Personally, I'd stop at 4.185", tops, especially with a small power adder. I like a little insurance in case an overbore is needed. As for stroke, 4.125" is probably tops w/o a tall deck, unless you want to run a high friction rod ratio. My opinion....

Utinator

I'm not sure if there is a difference in the sleeves they use on a 5.3 vs LS7, but Brian Tooley built an LS7 based 454 with a 4.250 stroke. It made right at 700 hp with a cathedral port set-up. I don't see why you couldn't use the same 4.250 crank with a re-sleeved 5.3L

02EBC5Z06

iTrader: (1)

Be better to have the bore larger than the stroke

Che70velle

iTrader: (6)

With a 4.250 stroke, you’ll need the max length sleeve offered by Darton to make it work…ish. It just so happens that I have a fresh RED Darton sleeved block in the shop. Towers are tapped for pipe plugs, fully de-burred and super nice. Rough bored to 4.148 for a 4.155 final hone, but can go out to 4.200 if your ready to party…. in case you guys are looking for a sleeved block. No wait.

ptero

iTrader: (1)

I have a 454 (4.185 x 4.125) built by Erik over 10 years ago, hell probably closer to 15. It’s still going strong. It’s in a late model GTO with the oil sump up front. I was having oil pressure issues after the launch so added a Daily dry sump. Perfect oil pressure since then.

I’ll be racing it this weekend.