C1 Block

[Michael S.]

I am gathering parts for my '59 restoration. I need a motor and have found several correct 283 blocks, however every one has at least one cylinder sleeved. My engine builder said he is indifferent regarding sleeved blocks. The block would be a CU, 270hp dual four barrel, manual.

Anyone have a view ? I just do not know if this is a good or bad thing.

Thanks

[Ed Jennings]

Re: C1 Block

LS1, LS2, and LS6 blocks are all sleeved. Properly done, it's not a bad thing.

[Robert Willis]

Re: C1 Block

The sleeve is probably better metal than the original cast iron. I would run a block with 8 sleeves and think nothing of it. You can't see them when the engine is assembled.

Bob

http://members.kos.net/willisb/

[Jack H.]

Re: C1 Block

I agree with the others... IF the sleeve job is properly done (step bored), today's sleeves will actually outlast the block's native steel. Now, if you're going to sleeve all eight holes, then you want to shop around for machinests with experience. The local good guy shops do these jobs two holes at a time on opposing banks so they obviate the remote possibility of the block straining in the machining process resulting in alignment drift from the crank...

[Michael S.]

Re: C1 Block

Thanks Jack, and everyone else by the way.

The final silly question- should I sleeve all 8 holes or only the ones necessary ? I assume only as necessary.

Thanks

[Jack H.]

Re: C1 Block

That's your call (sleeve all eight holes or address only those in need today)... Figure a good sleeve job goes for something like $125/hole (some charge less others charge more) and you can rack up a healthy machine shop bill pretty quickly....

On the other hand EVENTUALLY the day will come with a given block when 'someone' will be faced with that decision. So, do it now or do it later is one consideration. Cost is obviously another. One issue that not obvious is performance.

Taking the engine back to nominal bore results in more thermal mass, a cooler running power plant, and if properly sleeved, the machinest can 'print' an engine dead nuts on in terms of crank-to-piston geometry tolerance (another balance consideration). BUT, if you do decide to sleeve all eight holes, expect the piston suppliers to FREAK when you go shop for a set of eight pistons all at factory nominal! This is a parts request they SELDOM get....