Can you build 427 c.i. using an iron 6.0L block?
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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?
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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.
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.
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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.
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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
it sucks that cheap, reliable, and fast cant all go together
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Originally Posted by JDP
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
it sucks that cheap, reliable, and fast cant all go together
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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 ..
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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.
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GM can do this because except for the 4.8 and LS7, all LS engines use the same stroke crank.
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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.
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@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.
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