LBZ: Project "Cracked Piston"

[Wikid]

I have mostly roamed around these forums for the past 3 years but never really posted anything. Since this is a large build I wanted to throw it on here.

So I've had my truck about 3 years, when i bought it the owner already had a lift pump, traction bars, and Snow Perf W/M injection. 3 months in I had the trans built along with a Gorend X converter. Then installed SDP S475 twin kit, 60% over Exergy injectors, and a Mishimoto intercooler. Made about 689 RWH with water/meth injection on stock CP3. Ran that setup up until a month ago when I cracked the #8 piston.

The long block is being done by Custom Auto in Idaho.
Most parts being supplied by Scott at SDP.

The list:
New crank
Carillo Rods
Fingers Pistons Coated 16.5:1
Socal 6480 AF Cam
Socal Billet Flex Plate
ATI Dampner
Main Studs
Socal Valve Spring Kit
Block will be O-ringed and main caps dowel pinned
Injectors will be opened up to 80%
12mm CP3 from Exergy

S475 is going to be upgraded to Billet S480
Valley charger is going to a new GT3794 Billet 68

The Goal is going to be 1000 rwhp.

Right now I am kinda torn of a few items in the build and wanted to see what everyones opinions would be.

Headstuds, 14mm upgrades were recommend but I have also been told that ARP 425 12mm will do just fine at that power level and that 14mm has an increased chance of cracking a head with the larger holes and higher torque used. With the fact that the block will be O-ringed I wouldnt think a head gaskets would be a problem with the 12mm studs.

Manifolds and up pipes. these are stock right now but I will be upgrading the up pipes but i have heard quite a few high HP trucks still running the stock manifolds.

Let me know what you guys think.

 

[WolfLMM]

Basically same build I've entered into. I used 14mm studs, as well as o-ringed block. Everyone will have an opinion on 12mm 625s vs 14mm studs. The reality is there are a LOT of trucks running both with out issues.

 

[Wikid]

when I'm talking 12mm studs Im talking just the standard ARP2000. just trying to decide if upgrading to 625/14mm is necessary at those levels. The truck is going to be a weekend warrior not strictly a race truck.

 

[WolfLMM]

IMO, at 1000rwhp I'd go with 625s or 14mm. I'm just a keyboard warrior though.:hello:

 

[Wikid]

Whats your opinion on manifolds i see yours are upgrades

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[Awenta]

625 and rings will hold a ton of power.

I wouldn't use the regular studs at that power. Only downside to using 14mm is if you need a new head you need to have it machined again.


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[Awenta]

Go to 100 over injectors and at least a lml manifold on the drivers side


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[Wikid]

Remachining a head i can do myself as i own a machine shop. I didnt want to go to 100 overs to try to reduce hazing when driving it. They are already going to be kinda hazy with the fingers pistons.

Hmm didnt think about the lml manifolds are the lml manifolds a direct bolt up? Will they flow better on both sides?

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[PACougar]

Meh, I've been at 1k for a long time on grade c's and ARP 2000. I'm not saying there's anything wrong with going to a stronger stud, but with an O ringed head, I don't see how you could have a problem.

 

[WolfLMM]

Whats your opinion on manifolds i see yours are upgrades

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I'm still waiting on my motor from SoCal.

 

[TROJAN366]

I have Grade C's, ARP 2000s, no O-Rings and haven't had an issue. I wouldn't go any smaller than 100 overs.

 

[nmband13]

I'm on grade c's fingers 16.5:1 6480AF arp2000 studs. roughly 950rwhp and no issues all summer of racing. s369/s480. Doesnt haze for me. oh and 100% LLY injectors

 

[Wikid]

Hmm. Ill look into making them 100s as its the same price. Wasnt under the impression i would need to go that big for that power level. But it would reduce the pulse width

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[TROJAN366]

Hmm. Ill look into making them 100s as its the same price. Wasnt under the impression i would need to go that big for that power level. But it would reduce the pulse width

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I am running 16:1 fingers pistons with a 6480af cam and 100s and have no issue with the truck running dirty. There is plenty of fuel on tap with tunes 3, 4 and 5 but tunes 1 and 2 are spotless.

I should aslo note that I am running arp 2000s because I already had them and figured I would try it. If I was doing it again I would probably go 625s just for peace of mind.

 

[rgullett83]

I am running 16:1 fingers pistons with a 6480af cam and 100s and have no issue with the truck running dirty. There is plenty of fuel on tap with tunes 3, 4 and 5 but tunes 1 and 2 are spotless.

I should aslo note that I am running arp 2000s because I already had them and figured I would try it. If I was doing it again I would probably go 625s just for peace of mind.

Who's tuning if you don't mind? Sounds like we have the same build. Mine doesn't haze at idle, but is pretty Smokey until on boost

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[TROJAN366]

Who's tuning if you don't mind? Sounds like we have the same build. Mine doesn't haze at idle, but is pretty Smokey until on boost

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Mark tunes the truck for me. It will definitely leave a cloud if you flat foot it on the bigger tunes but tunes 1 and 2 are basically smokeless. 3 will leave smoke but only if you are hard on the throttle before the chargers light. Tune 4 and 5 are spotless once the chargers are fully spooled.

 

[S Phinney]

Project "Cracked Piston"

I've been over 1000hp on ARP 2000 studs. No o ring either. No problems. I do use 625s on that motor now and the block is o ringed as well. I planned to turn it up a little more. The insurance of those is cheaper than pulling it apart because of a lifted head. 100 overs is about your best option on a daily driver.


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[rgullett83]

Mark tunes the truck for me. It will definitely leave a cloud if you flat foot it on the bigger tunes but tunes 1 and 2 are basically smokeless. 3 will leave smoke but only if you are hard on the throttle before the chargers light. Tune 4 and 5 are spotless once the chargers are fully spooled.

I should have said similar motor build. Same pistons and cam. I also have stock heads ported by wagler, 100% exergy's, dual stock pumps, with an S369 as a single. I can drive it and keep it clean, but it requires a lot effort. My big tune is 701 HP.

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[Wikid]

I went ahead and had exergy take them out to 100 over. They will be working on them monday so that should be quick. Scott is going to get me an lml manifold to go with his up pipes. I have some other little parts i need to get ordered for running my fuel lines direct into the cp3 along with modifying my lift pump to take the 2 micron CAT filter

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[WolfLMM]

I agree with Shane, do the 625s and o ring, it's cheaper than having to pull apart from a lifted head. That is why I went the route I did. Also depends on how you drive it..... I'm hard on my stuff, arp2000s would not hold the heads down for long on my truck.