260 how far to bore
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260 how far to bore
I have a 260 that is .040 over I think it will clean up by just honing. If not can this motor be bored to .060 over ? Also the heads have 289 cast on the top of them is this an ok setup. And lastly will any small block bellhousing fit this block as long as it's a 5 bolt. I would like to put an np435 behind it Thanks for any help Rick
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Silvolite shows .060 pistons.
http://www.beckracing.com/slvpg46.htm
That don't mean your block will take it.
You can have it checked before you bore it. If a hone job will work, you'll be better off anyway. Thin wall motors with even thinner walls become overheated motors much easier.
Perhaps another 260 owner will pipe up.
I remember an engine book I had showed a guy "o-ringing" a 260 block, putting the big valve 289 heads and a blower on it. (published in the mid '60s) It said the 260 was the better choice for a blower motor as the 289 didn't have room for the o-rings.
Your 289 marked heads are fine---it runs good, right?
Yes, you have to find a 5 bolt bell with the tranny pattern you want. Good luck on that one. Measure it out or take it with you when tranny shopping.
Here is a site with your input shaft and tranny mount specs. Looks like it should fit a stick bell that would take a T10 or toploader.
http://www.novak-adapt.com/knowledge/np435.htm
The 351 suggestion isn't a bad one.....if you have room for it.
http://www.beckracing.com/slvpg46.htm
That don't mean your block will take it.
You can have it checked before you bore it. If a hone job will work, you'll be better off anyway. Thin wall motors with even thinner walls become overheated motors much easier.
Perhaps another 260 owner will pipe up.
I remember an engine book I had showed a guy "o-ringing" a 260 block, putting the big valve 289 heads and a blower on it. (published in the mid '60s) It said the 260 was the better choice for a blower motor as the 289 didn't have room for the o-rings.
Your 289 marked heads are fine---it runs good, right?
Yes, you have to find a 5 bolt bell with the tranny pattern you want. Good luck on that one. Measure it out or take it with you when tranny shopping.
Here is a site with your input shaft and tranny mount specs. Looks like it should fit a stick bell that would take a T10 or toploader.
http://www.novak-adapt.com/knowledge/np435.htm
The 351 suggestion isn't a bad one.....if you have room for it.
Last edited by 85e150; Jan 3, 2005 at 10:50 PM.
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From: Destin/Ft. Walton Beach,
Bored out an engine 29 cubic inches? Ummmmm....... I don't think so. That's a little less then 4 cubic inches per cylinder. With a .060" overbore on a 302, you gain about 8 cubes. Total. All 8 cylinders together.
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From: shepherd
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From: Destin/Ft. Walton Beach,
A 306 is a 302 overbored .030', correct? This I know. You are gaining 4 cubic inches. If you double the amount of overbore, would you not double the cubic inches gained? 4+4=8 Correct? Somehow, you gained 9 cubes.
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260 = 3.80 bore
289 = 4.00
Overbore .200?
Maybe those 260s were thickwall castings.
To figure your bore CI increase, use the cylinder volume formula:
Pi x bore radius squared x stroke x number of cylinders
3.14 x 4 x 2.87 x 8 = 288.377
.030 over:
3.14 x 4.060225 x 2.87 x 8 = 292.719
Take Pi out a few more places and it helps.
289 = 4.00
Overbore .200?
Maybe those 260s were thickwall castings.
To figure your bore CI increase, use the cylinder volume formula:
Pi x bore radius squared x stroke x number of cylinders
3.14 x 4 x 2.87 x 8 = 288.377
.030 over:
3.14 x 4.060225 x 2.87 x 8 = 292.719
Take Pi out a few more places and it helps.
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some engines can take a big bore some cant.i bored a 272 .165 over and have seen them .205 over.does anyone know the space between the cylinders on a 26o and289.i done this back in 72 on a 65 fairlane that had a 289.we needed a block and couldnt get one.we decided to chance a 260.we kept track of it for a couple of years.no problem.
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Well, based on what the original post said, this here may be a job for:
Sonic Test Man.
That way, he can see how much wall he has and if he can't clean it up with a hone, whether to bore or put it back together as an oilburner....
Sonic Test Man.
That way, he can see how much wall he has and if he can't clean it up with a hone, whether to bore or put it back together as an oilburner....
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