Will this be a problem? Pics inside.

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Aug 7, 2006 | 08:59 PM

ShevrolayZ28

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Will this be a problem? Pics inside.

I noticed these divots in the combustion chambers on one of my new heads. There is one divot of varrying degree in size in each chamber, but only on one of the heads. The other head is near perfect in comparison.

Is this going to be OK?

And this casting defect on the same head. (Middle of pic, near the larger round hole.)

Aug 8, 2006 | 09:27 AM

ShevrolayZ28

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Jeez, no one even looked at this thread.

A little input would be much appreciated.

Last edited by ShevrolayZ28; Aug 8, 2006 at 09:35 AM.

Aug 8, 2006 | 09:31 AM

Npak

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take some 800 grit sand paper and sand it down a bit. if i had a zoomed out of the first and second pics could tell ya what kinda problems might come out. zoomed out as in lil more of a picture than was posted.

Aug 8, 2006 | 10:08 AM

ShevrolayZ28

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Thanks for your post!

But that's all I have for now as far as pics go.

Basically there is a dimple, as shown in the first pic, in the same place, in each combustion chamber on one of my heads.

My concern is that this would effect flow/combustion. Heck, this is the first set of aftermarket heads I've taken a close look at.

I had the head on the car and was just going to go with it but I don't know. Can someone that has seen a few of these say whether or not they've seen this type of defect? And if I should send the sucker back?

I sure would like to resume assembly!

Aug 8, 2006 | 10:29 AM

2000TransAmWS6

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Quote:

Originally Posted by ShevrolayZ28

My concern is that this would effect flow/combustion. Heck, this is the first set of aftermarket heads I've taken a close look at.

my concern for you is not about the flow or anything, it would be if that spot on the combustion chamber would become a Hot Spot causing pre-ignition.

Aug 8, 2006 | 10:35 AM

GuitsBoy

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I think thats pretty standard as the CNC track breaks through the differences in castings. While you should be okay, it wouldnt hurt to hit it real quick with a polishing wheel on a dremel or something. Try not to take off any metal, but smooth out the rough texture.

Aug 8, 2006 | 10:36 AM

ArcticZ28

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That's not cool. I'd contact whoever it was that sold you those and ask them what can be done about it.

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Aug 8, 2006 | 10:57 AM

ArcticZ28

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Then sand it down to get it smooth. Either way I wouldn't leave it that way.

Aug 8, 2006 | 12:53 PM

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YsoFast

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Who in the hell made those? I have never seen anything like that. My stage 2.5 AS heads were so clean that my engine builder and all his buddies still talk about them. "Some one takes pride in there work" I didn't tell them about how bad the owner of the company screwed everyone over. lol

Aug 8, 2006 | 01:52 PM

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lunatik

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Quote:

Originally Posted by ArcticZ28

Then sand it down to get it smooth. Either way I wouldn't leave it that way.

Yes +1!, I cant see the texture/size of the rises and pits but do not risk a hot spot. any irregularities like this is a sharp increase in surface area. The more s/a the more energy(heat) can be concentrated (hot spot) and collected in that region. This is a big reason poeple polish the combustion chambers. for a even heat distribution and it possesses the smallest s/a. A sharp spike in s/a can be a sharp increase in temp in that region. At least do it for a peice of mind.

Aug 9, 2006 | 10:33 AM

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ShevrolayZ28

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I spoke with the vendor, the local LS1 guru, the manufacturer, and they all thought I'd be OK and that this sort of thing is not unusual.

So I went ahead and sanded the dimples down and installed it. With just a little massaging two of the dimples are totally gone and two are barely visible.

But it would have been nice if both heads came without the dimples. Oh well, the installation goes on. Pushrods are on order.

Aug 9, 2006 | 10:36 AM

#13

ArcticZ28

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Quote:

Originally Posted by ShevrolayZ28

I spoke with the vendor, the local LS1 guru, the manufacturer, and they all thought I'd be OK and that this sort of thing is not unusual.

Of course they told you you'd be "ok". It won't cause your motor to blow up but it certainly shouldn't be that way. Not to mention they certainly don't want to pay shipping back to them to sand down some small crap they obviously neglected. Now, if they actually disputed the fact that areas like that cause hot spots, I'd highly question them.