Iv got a serious question. I'm having my 383stroker fixed because the machine shop that the shop used boarded it out more than they thought to clean up the bores which caused my engine to use an excess of oil because there was to much space between the rings and the walls of the block. They are fixing it on there pockets. My question is I'm planning on boosting it to the tune of 600-700+ wrhp, so the pistons are going to be custom made to fit. Will the extra material removed making the walls thinner be an issue at that power level?

 

Not near enough information to say... What block? What was the original bore? What's the bore now? What's the piston diameter and/or wall clearance?

 

The block is a stock ls1 I had the made to the 383 stroker. The final bore according to the shop will be 3.910. As for the pistons I'm having custom ones made. I guess the biggest question I have is, Is the 3.910 bore ok for a 600 rwhp setup?

 

Anyone???

 

you need to tell us if you had it bored .030 over to get the 383 or if you are using a different crankshaft.

I am glad you mentioned this is a serious post. Ill take the rest of them as not so serious since they didnt mention it.

from the info you give, it makes no sense. if there was too much space between the walls of the piston and the cylinder then improper sized pistons were used.

custom made to fit pistons? more like they are going to match the piston size to the bore size.

with 500 plus horsepower, there is little that is reliable. unless you buy a ferrari.

 

Sorry I keep forgetting Information this is all getting my nerves that its taking this long for the shop to get it right... I used a 4inch crank from callies to get to the 383 ci. From what the shop told me the pistons they used were wrong from the start but im going to guess they never thought about this since they send the engines off to be build. The owner is talking to diamond to get the pistons. I told him the power goal I wanted so I think he is getting either a 9.5:1 or 9.7:1 compression piston made so itll fit. my goal was to have close to 800+hp but ill take 600+ for now. This is all the shop has told me as far as the bore goes. I just wanna make sure that final 3.910 bore size will be ok for 600-650 wheel hp.

 

Your max bore on an LS1 is 3.905. Read here https://ls1tech.com/forums/generatio...ls1-block.html

How are you planning on making 800+ hp? forced induction I presume? If so, I would take it to a reputable shop who knows the ins and outs of building a forced induction engine. Just about any machine shop can assemble a stock long block, but if you start throwing anything other than OEM parts at them, they just wing it, on your dime.

If it were me, I would cut my losses, find another LS1 block and have another shop build it. If they have punched your cylinders out to 3.910, it is going to need to be resleeved.

 

I'd agree that its time to cut your losses with this shop and look into a new block altogether. If they couldn't get the piston-wall clearance right, how confident can you be that they got the bearing clearances right?

I'd go with a 5.3L iron block, punch it out to 3.905" and go from there. you may still be able to use the old pistons if they're not in bad shape. If not, and you have to buy new pistons anyways, maybe a 6.0L block would be better.

 

IV got all of the parts I needed for my turbo kit. I need a clutch before i get to the 800 mark, so I was planning on only doing 600 to the tire.

 

Which would be the cheapest rout. Get the 6.0l or get the 5.3 and punch it out to 3.905? And if I do the 5.3 iron can I use the crank and rods i have?

 

It really depends on what shape the pistons are in. The 5.3L blocks are a lot cheaper than 6.0L blocks, but the 5.3L would have to be bored, then honed while the 6.0L would just need a hone, so thats a wash.

If you have to buy pistons, go with the larger bore block and gain the extra 25 cubic inches.

 

As of this morning the shop owner is talking to diamond to get pistons made to fit that bore. I don't care if I have to do work to the block if I have to get another one, I just need to know the cheapest route for the money, even though having a 408 iron would be kick ***, I need the care back

 

With a 3.910 bore, 9.7:1 compression, turbocharged, and the word 'cheap' being thrown around, that LS1 is not going to like you very much.

 

i would run it myself and not worry about it if an extra .005 makes the difference in the block holding or busting it was a junk block to begin with at .005 more bore that is just .0025 per side of the cylinder and that is about the thickness of a hair or a sheet of paper

 

Thats what a few shops I have talked to have said, at the power level I want to make ill be fine.. Im just going to leave it at 600-650 and be happy with it

 

Best of luck to ya!