1973 Chevy 427 tall deck block with steel crank. bored .100 over cnc blueprinted, bronze lifter bushings, 10.200 deck height, 4.350 bore, .250 wall thickness. i was building this as a 565ci blown stroker and ran out of money, my loss is your gain. over $1000.00 in machine work. Great project motor for street rod or muscle car. this is only the block connecting rods and 2 steel 427 cranks. Thanks, Ken

Are you trying to sell this? If so, drop it down in the Swap Meet Section - you'll probably get better results.

I'm looking to buy a 427 an found this ad. they also have these heads for $500 more.

1970 Chevy 427 Big Block Heads casting #3986133. 106cc chambers 2.065 In valve 1.720 Ex valve. Hardened ex seats, Valves de-schrouded, Viton positive valve seals,performance valve springs, 3 angle valve job plus bowl work.

Does it sound like I should look into it? Thanks, Ken

1973 Chevy 427 tall deck block with steel crank. bored .100 over cnc blueprinted, bronze lifter bushings, 10.200 deck height, 4.350 bore, .250 wall thickness. i was building this as a 565ci blown stroker and ran out of money, my loss is your gain. over $1000.00 in machine work. Great project motor for street rod or muscle car. this is only the block connecting rods and 2 steel 427 cranks. Thanks, Ken
you forgot to say how much $$$ he is asking for those parts

It does not sound real good to me because unless this is a dart block or something you will never get a 4.750" stroke crank to work. Some one does not know what they are talking about.
With the motor at 100 over good chance the walls are thinner than .250.

Thanks sami He wants $1000 for the block and parts and $500 for the heads
I was thinking it was .010 oversize. (duh)

I didn't think the tall deck blocks would fit anyway. Am I wrong?

Why all that work on a set of heads and you don't even update to bigger valves??? 2.19/1.88's are the norm anymore. I'd pass.

^^ I didn't even notice that^^^
Sounds like someone is full of it.

You ain't gonna get 565 out of a production block unless it happens to be a very thick walled 502 block. 505 is about it with a stroker crank. He ain't got .250 thick cylinder walls on any production block at that bore. My CNC Bowtie will have .260 on the thinnest thrust side at 4.600 bore.
Sounds like a serious line of BS. I'd pass, find you a standard deck block, get a cheap stroker crank and some 781 heads with big valves and you'll shred tires at will.

I have sleeved a .100 over 454 block (4.350 bore) and even boring to fit the 3/32 thick sleeve, it did not break through the cylinder wall. Boring a cylinder out to over 4.5" and not breaking through means that the stock 4.250 bore is relatively thick, and the truck castings are likely even thicker.
So don't discount very thick cylinders on a production block.

You can easily install 4.375 stroke in a production 454 block.

They may be very thick, but if they ain't siamesed, they ain't goin' 4.500. You might find one that on a perfectly aligned CNC machine could get one to 4.500 all the way down, but you'll be able to see light thru the cylinder walls - they can't mathematically be more than about .025 thick.
No doubt most production blocks will swallow a 4.375 stroke crank, though.

Thanks for all the schoolin y'all. I'm glad I asked and have this place to ask at:bowtie:

They may be very thick, but if they ain't siamesed, they ain't goin' 4.500. You might find one that on a perfectly aligned CNC machine could get one to 4.500 all the way down, but you'll be able to see light thru the cylinder walls - they can't mathematically be more than about .025 thick.
No doubt most production blocks will swallow a 4.375 stroke crank, though.

Cut was to ~4.530" IIRC to fit the sleeve, so there was more than .025 left over 4.5"... Didn't break through at all.

Even if one were to get a 4.500 bore and put in a 4.375 stroke crank in it would only be 557cid not 565cid like the seller is claiming.
IMHO if you were able to bore a stock block out that much it would be very weak.