Time for a rebuild....
Time for a rebuild.... Alright guys, recently i spun a bearing. Its now time for the rebuild. I'm pretty much set on a forged 355 build, and down the road, boosting it. In the end im looking to have the compression ratio down to 8.5-9.0 :1, be able to handle up to 15 pounds safely, and eventually lay down at least 500-550hp to start with (eventually more). Like stated, the boost will come at a later time, im just focusing on THE BOTTOME END for now (tranny, rear end, and fi will come later).
I've been looking at advanced induction rotating assemblies, and their fully forged set up seems to be a good deal. Not sure how reputable compstar's products are though. I've also heard good things about eagle. I need to know what kind of piston/rod combination I would need to gain my wanted compression ratio .I'm really interested in getting some feed back from guys like skinnies with single turbo set ups, and really any body who's gone fi and knows what they're talking about.
I'm looking for durability at a reasonable cost. Thing doesn't need to be bullet proof, but able to handle some power and be reliable. Deff looking into splayed main caps (just need suggestions on which ones), clevite bearings (do they have main and cam), also options on timinig chains, head gaskets, bolts/studs (probably arp), and maybe half filling the block. The thing will be shifting by 63-6500 rpms. It will also be driven on a regular basis, with the regular wot hit. Thanks in advance.
I've been looking at advanced induction rotating assemblies, and their fully forged set up seems to be a good deal. Not sure how reputable compstar's products are though. I've also heard good things about eagle. I need to know what kind of piston/rod combination I would need to gain my wanted compression ratio .I'm really interested in getting some feed back from guys like skinnies with single turbo set ups, and really any body who's gone fi and knows what they're talking about.
I'm looking for durability at a reasonable cost. Thing doesn't need to be bullet proof, but able to handle some power and be reliable. Deff looking into splayed main caps (just need suggestions on which ones), clevite bearings (do they have main and cam), also options on timinig chains, head gaskets, bolts/studs (probably arp), and maybe half filling the block. The thing will be shifting by 63-6500 rpms. It will also be driven on a regular basis, with the regular wot hit. Thanks in advance.
The Compstar stuff is better than Eagle, both are forged offshore but the Compstar is machined and balanced by Callies in the US. By the time you figure in rebalancing the Eagle stuff and the probability of a dimensional problem somewhere you will easily be at the cost of the Compstar stuff all said and done.
Look at AI's results page if you go with their topend 15psi will put you way over goal.
I would probably aim for a little higher compression, remember this is an LT1, they love compression. I know you are going FI but still 8.5 is what you would build in a gen 1, I would raise your target compression range about half a point. That way it will be more responsive before the boost come in.
Look at AI's results page if you go with their topend 15psi will put you way over goal.
I would probably aim for a little higher compression, remember this is an LT1, they love compression. I know you are going FI but still 8.5 is what you would build in a gen 1, I would raise your target compression range about half a point. That way it will be more responsive before the boost come in.
Well 15lbs is not necessarily what i will be running, especially not at first, but i want to be able to run that much if i wanted to. Second thing is that AI has 3 different 355 set ups, i'm not sure how strong the stock crank is, but i'm thinking that forged is deff needed for my plans. Now the only thing different I see is the pistons and ring. How much more of a beating would the upgraded pistons and rings stand up to?
Also, with the compression ratio, i figured i should get it as close to 8:1 as possible, although i can see how that would not really be necessary for even 15lbs. But I just want something that is going to be reliable.
Any other suggestions on the rest of the build (splayed mains, gaskets, bearings, etc.)?
Also, with the compression ratio, i figured i should get it as close to 8:1 as possible, although i can see how that would not really be necessary for even 15lbs. But I just want something that is going to be reliable.
Any other suggestions on the rest of the build (splayed mains, gaskets, bearings, etc.)?
You do not need to go that low on compression, NA pump gas LT1s at 11.5+ are normal. 9.5:1 is two full points low and plenty low enough for a boosted setup and this will make it drive well off boost.
I would consider splayed mains though studded would likely work as would the stock crank.
I would consider splayed mains though studded would likely work as would the stock crank.
From the few time I have seen guys try and push it YES I am saying the stock crank would work.
I know ProGram gets some good press on the other forum(look in Advanced Tech at camaroz28.com) for main caps and I know Competition Products has some billet ones nicely priced.
I know ProGram gets some good press on the other forum(look in Advanced Tech at camaroz28.com) for main caps and I know Competition Products has some billet ones nicely priced.
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I guess i should be looking at the budget 355 kit and just get some clevite bearings. Although i dont know if those pistons will drop the compression enough. What about the head gaskets? Felpro?
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Your going to have problems getting a piston with enough dish to yield a compression <9.2/1 with the stock castings.
The combustion chambers are just too small.
So better budget in some heads too!
The combustion chambers are just too small.
So better budget in some heads too!
I will deff be getting some head work done, whether it be ported stock castings or aftermarket heads. But as of right now im just focusing on the bottom end. i.e. crank (not really sure what the limit of the stock one is), pistons, rods, bearings (cam and mains), splayed mains, block fill, studs/bolts, and timing chain if the stock one is not going to be up to the task.
The thing is, i really wanna get her running, and the problem is a spun bearing. So I need to rebuild it, but i wanna do it right the first time. Kinda trying to keep future plans in mind.
Suggestions on these parts, strength and experiences with them, cost, where to get them, what compression they will yield me, and any other info or opinions.
I mean, if you dont think a budget build will be able to handle it then why? When is it necessary to go forged crank? I'm really just trying to learn as much as i can the first time around.... not when i'm rebuilding because i blew the motor again.
All help is greatly appreciated.
The thing is, i really wanna get her running, and the problem is a spun bearing. So I need to rebuild it, but i wanna do it right the first time. Kinda trying to keep future plans in mind.
Suggestions on these parts, strength and experiences with them, cost, where to get them, what compression they will yield me, and any other info or opinions.
I mean, if you dont think a budget build will be able to handle it then why? When is it necessary to go forged crank? I'm really just trying to learn as much as i can the first time around.... not when i'm rebuilding because i blew the motor again.
All help is greatly appreciated.
Well I mean it *may* be fine, but 15#, you are talking like 700+ to the wheels. I would want the peace of mind that it *would* be fine at that type of power level. Maybe that's just me. Not saying it wouldn't work.
Well as said the compstar stuff is good. Go with some quality h-beam rods, good pistons (i.e. not SRP) probably with a -31cc dish, Diamond or JE are good there. Maybe some trickflow heads to help with the compression if the piston doesn't do enough for you. Any 4340 crank works.
Not sure on the calc...
But... You wont get under around a 9.2/1 with the stock heads with a off the shelf piston. Your either talking custom pistons or get aftermarket heads with a bigger combustion chamber. Mise well buy a off the shelf big dish forged piston, good rods, and a set of Trick flows.
I think a compression ratio less than 8.7/1 would be a waste. Grand Nationals have 8.4/1 and people beat them to 30#'s of boost spraying tons of meth.
Well i'm deff. considering keeping it around 9:1. The thing is, with the kit i'm looking at, i can either choose from -26cc or -16cc pistons. I'm trying to find out if I can just go with the -16 and make up for it with the head gasket and eventually some bigger heads.
Also how well do the forged mahle pistons hold up to boost?
Also how well do the forged mahle pistons hold up to boost?
Last edited by projekt70chevelle; Feb 22, 2008 at 02:11 PM.
Soooo.... I've been thinking, with the kind of mileage on my motor it may be a little more "broken-in" past that .30 over used in a 355 set up. I will be finishing up on the motor pull tomorrow and still have to send it in for machining, but just thinking about other options. How well do low compression 383's do with boost compared to 355's?
Like previously stated I am set on an AI compstar rotating assembly, and I realized that the 383 costs the same as the 355. Just can't decide on what i should go with.
But another thing on my mind... 96caprice i am especially interested in your response... go with the budget 355 (keeping the stock crank) and putting that extra grand +or- more towards a set of AI200cc heads to compromise my cc503. Which i can then put the other money that was going to go towards heads into tranny,rear-end or misc parts.
What do you guys think?????
Like previously stated I am set on an AI compstar rotating assembly, and I realized that the 383 costs the same as the 355. Just can't decide on what i should go with.
But another thing on my mind... 96caprice i am especially interested in your response... go with the budget 355 (keeping the stock crank) and putting that extra grand +or- more towards a set of AI200cc heads to compromise my cc503. Which i can then put the other money that was going to go towards heads into tranny,rear-end or misc parts.
What do you guys think?????