Busa_rob

iTrader: (1)

I'm looking to build a destroked 6.0 turbo engine.

To save some money I decided to look for a 4.8/5.3 iron block to hog out as people want a few hundred bucks more for a 6.0 block.

While discussing this with a guy that had a few blocks for sale, he said the blocks aren't the same, and hogging out a 5.3 block would make it more prone to the cylinders cracking then starting with a 6.0. I don't think there's much truth to that as I heard this from a guy trying to sell me something. But I figured I would bounce it off a few guys here not trying to make money off of me.

Is there any truth to this?

1sick_eg

What's your reasoning for destroking it? What sort of application are we talking about?

KCS

iTrader: (20)

It's true, the blocks are not the same. You can bore the block to 3.90" and that's about it.

Busa_rob

iTrader: (1)

If you read it says for turbo... Very first sentence.

Dammit! Well for future reference how far over can I go on a 6.0? Not that I'm gonna go any bigger.

KCS

iTrader: (20)

It depends what you want to do and how much wall thickness is needed for your application. A mild street car engine doesn't necessarily need the strength of a 1000whp nitrous engine, so the max bore between the two applications will vary. If it helps at all, the 6.0L in my Trans Am is at 4.065" to make it a 6.2L, but it's just a heads/cam street car.

redtan

iTrader: (5)

By the time you pay for all that machine work to hog out a 5.3 block you've already gotten to 6.0 territory money wise (that all really needs is a hone if that). At that point, you have a great base in the 6.0 to hold the boost while the 5.3 is over .050 thinner all around which will definitely decrease its strength.

Either keep the 5.3 stock bore and boost the crap out of it or get a 6.0 to begin with.

Busa_rob

iTrader: (1)

Ah ok, yeah just a 1000hp turbo motor.

1sick_eg

It still doesn't state what you want the motor to do. Street/strip/road course, power goals, etc.

I've destroked turbo motors before(4cyl), but I'm wondering why you're wanting to. If you're looking to keep things fairly cheap, which is what it sounds like judging by your last post, why not just pick up an lq4/9, build the top end, turbo, and run 9's. You're looking to save a hundred bucks picking up a 5.3, but then you're talking about destroking it.

Busa_rob

iTrader: (1)

I have no problem spending assloads of money where I need to. However I'm not going to spend it just because I have it. If nothing else was different between the blocks except bore size, it wouldn't take genius to figure out which way to go if your going to bore the block anyways. But they aren't, so it doesn't matter. I can get short block 4.8s for $300 vs $800 for a 6.0. Only reason I was asking.

Being a person who claims to have destroked 4cyls, why did you do it? Your answer should be higher revs, broader power and torque bands throughout the rpm range.

1sick_eg

I know why we did it, rod ratio/turbo size/displacement. K24 block, F22 crank. It ran like a scalded dog, and revved to 10k. Don't get me wrong, I'm not trying to discourage you from doing it. I love a high revving motor, but you can hit your power goal without adding that extra 1000rpms or spending the money on a crank.

Busa_rob

iTrader: (1)

4.8- 3.276 crank. With 3.600 rods. 4.000 Pistons. Would be a 5.4.

I'm not cought up with how much power it makes, it's how it makes the power. I've seen one done before, and the results were spectacular.

1sick_eg

Gotchya. Interested to see it. I've read about a few turbo v8's destroked. Keep us updated when you start the build. What's this going in?

Busa_rob

iTrader: (1)

It's going in my foxbody.

1sick_eg

Great looking setup. If you say notchback, I'm going to need an address and the times you won't be home.

Busa_rob

iTrader: (1)

No it's a hatch. Thank you.

1sick_eg

Still looks good. I've always liked the lx 5.0's.

99Brd

My recommendation LQ4 6.0 stronger block, lower compression. Keep stock 317 heads.

Busa_rob

iTrader: (1)

Didn't ask for recommendations, just info on blocks.

I see no reason to run anything else, besides ls3 heads.