nitrous2fast

iTrader: (2)

He said that he is willing to put 400 sleeves in the LT block.... What do you all think?

He says a qtr fill should be done as well.

great421

iTrader: (1)

4.125 bore + 3.75 stroke = 401 (vs. a 383 with the "regular" 4.03 bore); so an extra 18 cubes, or 51 more than stock - a 14.6% increase

4.125 bore + 3.875 stroke = 414, or 64 more than stock - an 18.3% increase

What are his thoughts on the overall strength of the block - post sleeves and 1/4 fill?

nitrous2fast

iTrader: (2)

I had asked about if a half fill would be necessary for the swap and he said that only a qtr fill would be needed unless lots of rpms were in the future then half fill would be enough.

nitrous2fast

iTrader: (2)

LMAO!! He told me his price...

hrcslam

What was the price?

Valkyn

iTrader: (8)

There have been a few 414ci LT1s throughout the years and none of them have survive very long or made that great of power.

I would say your much better off sticking with a 383 or 396 combo, especially if you dont have a huge budget.

Valkyn

iTrader: (8)

edit - double post somehow

SS RRR

iTrader: (2)

I'm sure it's one of those things "... if you have to ask..." From what I've read from others exploring this it's ridiculously expensive. Not worth it, either.

joelster

I inquired at my local machine shop about sleeving a whole block. I don't remember exactly what the price was but he said it was easy to do. Each sleeve was $100-$125, the install was another $40-$50, then when it's done the block needs to be decked, and all 8 need a bore/hone. Total bill would be roughly $2000.

nitrous2fast

iTrader: (2)

That was pretty close. I get a decent discount, but was still enough that LS is a viable option.

great421

iTrader: (1)

So, $2000 for an extra 18 cubes (401 vs 383 / 414 vs 396) = $111.11 per (extra) cubic inch.

If those extra 18 cubes = 25 HP (reasonable) then the math works out to $80 per HP.

For that same 25 HP increase I might just bump up the CR half a point, or get anti-friction coated piston skirts [less frictional losses], or lighter valvetrain components [to rev higher]; I'm sure the other members can chime in on a more cost-effective solution.

SS RRR

iTrader: (2)

There's a reason why there aren't a bunch of big cube LT1 blocks around. Most of it has to do with the block itself. If big CID is desired it's better to use an LS platform.

BSmiff

Youre still not going far with a power adder regardless of the extra cubes because the pistons is still going to be too short unless you go with a smaller crank or custom shorter rod with both of which throwing off the rod angle and making that same motor with 400 sleeves work harder to produce the same or slightly higher hp.

At that point, youre better off just buying a dart tall deck little M block for $2500 and upgrading. If youre hellbent on the LT1 platform IMO and you plan on hitting it over the head with massive amounts of boost or nitrous; you cant spend your money on cubes you need to spin it higher. I would rather have a 355 that spun 8500 with heads, cam, and valvetrain to support it than have a 396-398 that is at the limits of the block. Not sure if anyones done that 355 idea yet but all the ford guys do it with a lot less deck height and them bitches scream. We have already proven with the fastest LT1 cars that the block can hold the power so why not use it and change the way we think.

joelster

They do make sleeves that can allow a 4.125" bore. A 4.125" bore with a 4.00" stroke is 427 cubes.

Shownomercy

iTrader: (1)

BBC ftw

nitrous2fast

iTrader: (2)

The larger bores also allow better flowing heads...

Puck

iTrader: (17)

The selection of heads you can run once you can get a "big boy" 4.1" bore is astounding...especially if you are willing to spend the money on custom pistons and intake work for a reduced valve angle.

Of course it is terribly inefficient use of money, when a BBS or SBC can do the same or better for a lot less money, but it is technically possible if you rind someone willing and crazy enough to dump that kind of money into a boat anchor LT1.

If I hit the lotto or came into a ton of money I would do it just to **** people off...fully sleeved high compression ~427 LT1 with worked SB2.2 heads and a nasty NA cam. Make ~900 HP on race gas and easily be the most powerful NA LT1 on the planet...with enough money spent that you could have made 500hp more with a turbo big cube SBC setup .

SS RRR

iTrader: (2)

I'd opt to have someone convert a billet block before messing with a stock one, or just say **** it and get a ZR1, Zonda, Murciélago, Koenigsegg, Ariel Atom etc...
Because the LT1 bores are not siamesed this would be next to impossible to do.

Shownomercy

iTrader: (1)

Shut up richard.

Twin turbo BBC with nawwwzzzz

SS RRR

iTrader: (2)

**** it. Sleeve a BBC to get a 5" bore. Then nawwss
That's DICK to you. Get it right.