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Old 07-12-18, 10:05PM   #1
sport65
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Default Anyone know if a 326 can be sleeved to a 4.120" bore, and ballpark what that costs?

Dying to put a .030" over 389 in my Lemans with 400 pistons/heads. Prices for A body 64 389 or 65-66 389 block seem rather much to me and most of them have been left outside.

I've got 2 known good 326 blocks. For the prices I've seen for a 389 that I don't know if good plus the costs to machine said block, I'm thinking might be better price-wise to sleeve a 326 that I have.

Don't know that much about sleeving just what I read so I don't know if I'd need dry sleeves o wet sleeves. Don't know if it's possible to do sleeves that big on a 326 or if anyone has even attempted it.

Can anyone "ball park" approximately what 8 sleeves would cost? (If plausible)

Please don't ask why LOL. Yes, I'm crazy.
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Old 07-13-18, 12:09AM   #2
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I have some 400 blocks
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Old 07-13-18, 01:24AM   #3
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Not even worth your time. Well over 1000 $, a lot more than that. Buy my std bore 400 block with splayed billet caps, 4.25 stroke rotating assembly. 1300$ for the block same for rotating assembly, Ross, billet 4340 rods,Eagle, balanced.New
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Old 07-13-18, 07:10PM   #4
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Quote:
Originally Posted by sport65 View Post
Dying to put a .030" over 389 in my Lemans with 400 pistons/heads. Prices for A body 64 389 or 65-66 389 block seem rather much to me and most of them have been left outside.

I've got 2 known good 326 blocks. For the prices I've seen for a 389 that I don't know if good plus the costs to machine said block, I'm thinking might be better price-wise to sleeve a 326 that I have.

Don't know that much about sleeving just what I read so I don't know if I'd need dry sleeves o wet sleeves. Don't know if it's possible to do sleeves that big on a 326 or if anyone has even attempted it.

Can anyone "ball park" approximately what 8 sleeves would cost? (If plausible)

Please don't ask why LOL. Yes, I'm crazy.
I have a 65 std bore 389 block for sale !
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Old 07-18-18, 02:42PM   #5
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326 castings were "thin wall" for economy car weight savings.
not meant for the big cubic inch loading.
Even if you had one of the early 326 blocks its not advisable.
The early 326s were actually oversized 334 c.i. until when in 1964 GM corporate " NO small V8 over 330" in an A body car" rules forced Pontiac to re-size the bores to yield a true 326" displacement.

We all know how long that rule lasted.

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Old 07-18-18, 06:56PM   #6
thomas flaherty
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To get 4.120 you need to bore a 389 close to .060 over. Now seeing others trying to sell you a 389 block. I will throw this out there but shipping would be a killer. I have a 66 389 block fully machined to 4.120 brass plugs dura bond cam bearing painted Pontiac blue etc with speed pro 400 std piston with speed pro race rings arp main studs.
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Old 07-18-18, 08:04PM   #7
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Quote:
Originally Posted by thomas flaherty View Post
To get 4.120 you need to bore a 389 close to .060 over. Now seeing others trying to sell you a 389 block. I will throw this out there but shipping would be a killer. I have a 66 389 block fully machined to 4.120 brass plugs dura bond cam bearing painted Pontiac blue etc with speed pro 400 std piston with speed pro race rings arp main studs.
Have you had it sonic checked ?
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Old 07-18-18, 10:03PM   #8
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Shipping cost would depend if its Glendale AZ, Glendale CA or Glendale China.
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Old 07-20-18, 01:54PM   #9
thomas flaherty
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Troy (dragncar) got your PM thank you I don't remember if it was checked for cylinder wall thickness I cant find the paper work and it was machined 7 years ago and sit in my cellar I'm not actively trying to sell it but just threw it out there
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Old 08-01-18, 02:08AM   #10
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Why did you say that?
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Old 08-16-18, 01:20PM   #11
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A 400 is about 3/8" larger bore. To put a 4.120" sleeve in you would have to bore the block to about 4.312". A 326 has a 3.72" bore. You would have to bore it .592" over it's standard bore. No way will the cylinders be that thick. You would end up boring right through the cylinder walls, and have nothing but open water jacket around the sleeve. Plus it would cost over $1000. Better off finding a 400 block and paying shipping.
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