Sleeveing a block

[SSDiv6]

Originally Posted by Alan Warman

I am having problems with my 307 Olds. The problems are #1 keep loosing ring seal. Number 2 the block is flexing and killing bearings. After the Baton Rough race,I noticed the oil pressure was starting to run at a lower pressure at idle. So I cut the filter apart and found bearing material. So out comes the motor and here is what I found. The center three main bearing bad, and the center three cam bearing spun. The main and cam bearing at each end of the block were good except were trash went though them. Rod bearings good except for trash. The 307 block has what they call windowed mains on the center three mains. The block was hard blocked and has about 75 passes on it. My question is can I use a 350 block and sleeve it down to a 307. Also I run solid motor mounts, they bolt to the center of the block. Could they be trying to pull it apart. Thanks for any info

Yes, you can sleeve a Olds 350 block to an Olds 307. Use the 1969 to1971 high nickel block. Also, you will need to use the early style Olds head gaskets on the early block too. After sleeving, use Embecco Epoxy instead of Hardblok.

[Tom keedle]

Originally Posted by SSDiv6

Yes, you can sleeve a Olds 350 block to an Olds 307. Use the 1969 to1971 high nickel block. Also, you will need to use the early style Olds head gaskets on the early block too. After sleeving, use Embecco Epoxy instead of Hardblok.

fwiw, i've heard that 76ish caddy sevilles had the "good" block, too.
what about the 350 olds diesel blocks?
they legal?

[BlueOval Ralph]

On another subjet a little known fact on Small bolcks Ford the vertical intake manifold bolts do more to pull bores out of round that the head bolts. Saw a study from Ford Engine Eng. back in the lat 60's when I was working there. Also when you lose # 2 & 4 main bearings it is usually due to crank bending.

Originally Posted by tomslik

fwiw, i've heard that 76ish caddy sevilles had the "good" block, too.
what about the 350 olds diesel blocks?
they legal?

[JRyan]

Alan,

Our blue SS/NA has a sleeved 350 block, NO FILL, and mounts on the side with welded stock mounts. We have over 300 passes on it, with the same bearings. We found a lifter going away, so we're going to freshen it again, but there is zero bearing material in the oil. It's not as fast as the purple car, but it's not nearly as trick either and it'll run 11.00's in good air, so it's no pooch. The point is, if your chassis is stiff enough, you won't have block problems.

I might add, the blue car has no bars forward of the firewall either, and we have never lost a bearing in that car in 13 years except for one mental lapse on my part -- got interrupted and forgot to put all the oil in. Whoops! But that block is still being used.

Jerry

[art leong]

Can you sleeve all the bores in stock?

[Alan Roehrich]

Yes. Some of the older small bore stuff is impossible to find.

[randy wilson]

If you pick the right sleeves and rings, it will actually pick up measurable H.P.

[FED 387]

we have used Darton sleeves with success in many applications---Comp 387

[Todd Bailey]

Had my engine builder tell me many years ago that if I brought him an engine run on rubber mounts and an engine run with steel mounts, he could tell which was which from looking at the mains. Rubber mounts and tie it down!!