Engine rebuilders advise needed!
Thread Starter
Pro
Joined: Apr 2006
Posts: 733
Likes: 1
From: Coquitlam British Columbia
Engine rebuilders advise needed!
I have purchased a 383 CNC'd bare block to rebuild off of an Ebay seller and this is what I was sent notice the rusting and pitting on the deck edges that remain and run very close to if not in the outer gasket area of the resurfaced deck.I have not built a zillion blocks but the ones that I have the deck surface has always cleaned up nicely after the deck resurface so have not been in this situation before.I also noticed that there is some very minor light marring or scratches in the cylinder walls that are over the finished hone in each cylinder of one bank of the block .My question at this point is am I taking any risk using this block our should I insist that they replace it? 
Drivers Side:
48:
49:
50:
51:
52:
Passenger Side:
25:
26:
27:
28:
Drivers Side:
48:
49:
50:
51:
52:
Passenger Side:
25:
26:
27:
28:
Drifting
Joined: Jul 2002
Posts: 1,995
Likes: 110
From: Garland Texas
I'm not seing much of a problem here. The larger areas on the outer edge of the deck are where the head gasket is notched for the liteweight heads. No problem there. The scratches in the cylinder are where the hone was slid out and drug on the sides. Not really a problem but rather sloppy work by the machinist. Use some steel wool to clean off any rust spots if you desire. Do Not Use scotchbrite!
Mike
Mike
Racer
Joined: Dec 2005
Posts: 368
Likes: 4
From: . New Zealand
Don't see any problem there with the decks, I'm assuming the block won't be used for racing, but it should be checked for deck height - should be ok if it's CNC but how much clearance do you need?
I don't mean to be picky, but I would never, ever lift a block with a lug attached like that. Always use the end bolt tappings.
I don't mean to be picky, but I would never, ever lift a block with a lug attached like that. Always use the end bolt tappings.
Instructor
Joined: Jan 2005
Posts: 152
Likes: 0
I would recommend that you take the block to a good engine builder. Let him tighten the main bolts and put on a set of torque plates and check the dimensions and roundness / ovality of the cylinders. This will tell you if something should be done to your block.
Also remember that there are different build in tolerances for cast / forged / makers of pistons so based on the outcome of the measurements have the builder and / or the forum advise you what to use.
And finally make sure that the block and specially the cylinders have been cleaned up thoroughly after the honing. Otherwise you will wear out your piston rings very fast.
Best regards, DK.
Also remember that there are different build in tolerances for cast / forged / makers of pistons so based on the outcome of the measurements have the builder and / or the forum advise you what to use.
And finally make sure that the block and specially the cylinders have been cleaned up thoroughly after the honing. Otherwise you will wear out your piston rings very fast.
Best regards, DK.
