427Nova

Can the 6.0L iron block be bored and stroked to produce 427 cubic inches? If not, what is the most cost effective block/bore/stroke combination to produce a 427?

Gannet

A 4.060 bore and 4.125 crank produces a long-stroke 427. A 4.080 (L92) bore and 4.100 stroke gets a 429. Whether these are the most cost-effective ways to go is another question. You're either going to spend money on a C5R or sleeved block or on a over-4" stroker crank and custom pistons.

Texas Speed lists a 4.100 Eagle crank at the same price as a 4.000, $900. Combine that with a 4.060 LQ9 block and you get 424.6. Close enough? The disadavantage is that I believe you'll need to spring for custom pistons, so that's a few hundred extra.

The 4.00" stroke appears to be very popular with LSx engines, the larger strokes much less so. I suspect there are good reasons for this having to do with block deck height, compression distance, etc.

Texas Speed does a 418 4.080x4 L92 shortblock for $4755. Katech has their value 4.125x4 sleeved 427s for a bit under $7k. I doubt it can be done much, if any, cheaper than either of these packages. You might call TSP and ask about a L92 block with the Eagle 4.1 crank and custom pistons for 429cid. I'm going to guess at around $5200. If you do, please post results; I'm interested myself.

Beast96Z

iTrader: (21)

Actually, the long strokes are becoming much more popular these days. I wouldn't run longer than a 4.125" on a stock sleeve/iron bore legnth, but it can be done. Personally, I would do a 4.060" x 4.100" if I were working with a iron block. This will keep the cost at bay. Pistons won't be but $100 to $200 more than the average shelf piston. I'd say the iron 425 could be done for less than $4500.

JDP

iTrader: (21)

i would love to go bigger cubes, but resleeving a block costs an arm and a leg. i want to go bigger but there seems to be no cheap way of doing it, the 408 from TSP seems to be the best for the money.

it sucks that cheap, reliable, and fast cant all go together

Beast96Z

iTrader: (21)

You could easily tell them to swap in the Eagle 4.100 crank instead of the 4". Price is the same. Pistons may be a touch more, but nothing unrealistic.

CM1Magnus

To answer your question.. no a 427 is 7.0 liter’s
there is no such thing as a 6 liter block because the liters consist of bore and stroke, so the block can be any liter with in that range, a few over or under .. but only a few like 6.3 or 5.8 liters ..

01CamaroSSTx

iTrader: (3)

It's called a poor mans LS7 but certainly not something recommended. First off your over boring the 6.0 block and the cylinder walls will become too thin. If the block was sonic tested and you could take it .060 over and with a 4.10 crank you'd have a 425. It's best to not go over .030 on the bore and build a more reliable engine though.

99 Black Bird T/A

iTrader: (4)

Actually up to a 7.2 liter engine can be built. Check out Can-block-be-saved-4-250-stroke-lq9-build thread explores what possible.

G Atsma

Generically speaking, LS blocks are regarded by their ORIGINAL displacement because the displacement is cast into the end of the block (4.8/5.3, 6.0, etc.). Any 4.00" bore block is a 6.0 block, and 3.78" bore is a 4.8/5.3 block due to 2 different stroke cranks used to get the 2 displacements.
GM can do this because except for the 4.8 and LS7, all LS engines use the same stroke crank.

CattleAc

iTrader: (7)

Holy "back from the dead thread" Batman...!!!

02*C5

iTrader: (1)

👆🏼This right here. Reliability is key, why spend thousand of dollars on a build that will ultimately fail sooner rather then later, and you'll have to start over again from scratch . Build a solid 408 for boost or nitrous and you'll be running with the big boys. Or buy a ready build 427 and go from there. I'm thinking of doing a 12:1 408 set up to hold a 300 shot and throw a 200 shot down it's throat. Over build for reliability, nothing wrong with that.

Old Buzzard

Profound statement to say the least.....

G Atsma

Plus he had the ignorance to think the poster he was replying to was still around to read his profundity... LOL

grinder11

iTrader: (1)

The LQ9 is commonly referred to as a 6.0L block, because that WAS the factory displacement they were available in. Of course they can be built in many sizes. But what your saying only confuses things. Its like saying the LS1 5.7L block isn't a 5.7L block, which it is commonly known as. I seem to be missing your point on all this. Why promote confusion over commonly used terminology, in use for over 20 years now?? To add insult to injury, you've brought back a 16 year old thread!!!!!

grinder11

iTrader: (1)

Yup, the guy has probably built, then wore out, whatever engine he ended up with, since 2006!! Plus, he hasn't posted anything since 2018.......

LilJayV10

iTrader: (39)

That has to be one of the most ignorant things I have ever heard....ever....

99 Black Bird T/A

iTrader: (4)

@CM1Magnus seems to have breathed life back into into this 14 year old thread with his single post...and hopefully learned some in the process.

02*C5

iTrader: (1)

Funny 🤣