hello all, I received my 455 block back from the machine shop and noticed discoloration on the walls. I spoke with the shop and they said it won’t affect the performance. The piston for that bore is in great condition. I’m just concerned because when I run my fingers across the discoloration it feels uneven. I don’t want to take it back to the same shop but it’s the only one in town. Is this something I can fix with a ball hone. Please see pictures
the ball home might smooth the out some and won't hurt but won't fix it, that just some light staining/micro putting that has etched into the metal. the only way to get rid of it is to bore the cylinder, and depending on how deep it is might not get it all gone. now do I think this is something that going to have a major issue on overall performance.....not really it doesn't look like the block was power honed.....so depending on clearances it might be something that could be done and will do a better job than a ball or deglazing stone........but will require the block to be washed done again
The block was mag’ed, hot tanked, block/ heads surfaced and honed by the machine shop. I wasn’t really thrilled about the end result. I still had to remove gasket material and clean the surface of the block.
I see vertical scrapes on the cylinder walls. I'm thinking from rings. Your guy did pretty much nothing but take your cash. I'm not an expert but I'd bore that thing to the next bore size and have the deck surface cut . Jim
If you want longevity, that is a no go. If you want to run it hard for a little while, go for it. See how long it lasts... Don't count on a warranty
if they cut your heads and deck there would not be any gasket left. here is just I a pic pulled from the net, you can see the cylinder walls have been honed......nice cross hatch pattern at 45*, and you can see on the deck surface the fresh cut marks that swipe across the surface you can see on the one even after honing you can see the stain or discoloration still, but has the crosshatch and doesn't look like yours
Yep. That's why I asked. The vertical scuffing and overall appearance show it was not even honed. You have a good case for a refund (minus the labor to disassemble). Where are you located? Someone should know a decent shop within reasonable driving distance you can take the engine to and have them evaluate and with that information, you can get good recommendation on direction to go from here. I would have no confidence in the shop that did this.
I agree with the previous posts. I don't believe they honed your block. Take it somewhere reputable not to far away and make a claim for a refund. I wouldn't build a new motor with the bores like that. My 2 cents
I also would not even think about putting that into service. Sad to say I believe it's time to check all the work they "Claimed" to have performed. From the photos you posted, .... it looks like they have done a whole lot of nothing. As mentioned, I would find a different shop that has great reviews and have them take a look at the job, and perform what needs to be done. Larry
It looks to me to have ware from the piston skirts. I would say that the bore is not round and is oversized for the pistons, too much clearance.
What bore are we looking at? The wall surface looks like it was ball honed with a fine grit. That looks like it could be pison rock wear. Working on an engine like that now . Ray
I have a very pessimistic opinion on some "machine shops" They're biased "if it aint what we usually do, they wont know the difference" In other words if it isn't a Chevy who cares I paint cars for a living, and I don't care if the car is 20 years old or a new model, I do the best I can, I don't play favorites
don't run that crap! find a shop that will fix those bores. That means new pistons, don't cheap out. If not it's going to cost you more in the long run.
So just because that was the only shop in town you HAD to use it??? So if your sister is the only woman in the house does that mean you HAVE to sleep with her?? Lol just some light funing around with you please don't take offense! I would be driving that block anywhere but that shop. When I'm ready to have the machining done on my engine I'll be driving it 2.5hrs. Each way to have it professionally done instead of the half-assed Chevy guy 15 minutes from me. I hope everything works out for you and you get your money back and your block fixed. Cheers!!
That's what I was wondering. Engine Building 101: Ya gotta measure the bore to determine if it's in spec for diameter, roundness, and taper. If there is too much wear, it should be rebored. It looks like the shop just did a 'glaze breaker' hone. That's not going to do much to remove deeper defects like yours shows.
I drive about 5 hrs each way to have our motors done......I have a shop 10 mins away I use for things like bearing on and off etc........but I wouldn't let them even measure my buick motor anymore. took them a set of heads to refresh, car slowed down .5 in the 1/4. was going to refresh my motor myself, nothing major wrong just 2500 passes on it, got the block back and 2 of the 5 cam bearing were in wrong.
