427 with 4.280 pistons?

[gt350hr]

    The big problem "I" see on the rocker failure issue is the pushrod is too short. As the ball on the adjuster gets further out of the rocker body itself , the "leverage" at "rock over" becomes more severe and ANY rocker will be over stressed in THAT area. I have seen stock cast iron , Dove and Harland Sharp broken in the same location. "If " prefect contact pattern requires the adjuster to be that for out , you need a rocker  with more material / more "blend radius material" to remove / relocate the stress point seen in the failures.
   Randy

[gt350hr]

     I am sorry two of you found out the hard way what I have been saying for decades. Sleeving ALL 8 cylinders back to standard is a BAD deal. You can NOT restore virginity!  IF you spend another $2,000 in furnace brazing the sleeves to the block ( and ALL of the remachining required AFTER the furnace brazing) you have a chance because the block becomes "one piece" again.

[jayb]

You know, I don't know what reputable machine shop would ever recommend sleeving all 8 cylinders, or for that matter sleeving two adjacent cylinders.  Anybody in the business ought to know better.  The exception would be sleeving a 427 block down to 390 size; I have heard of that being done with a stock eliminator engine, so that you are not boring the original 427 bore out very much for the sleeve, and therefore the deck integrity remains. 

As far as supercharging an FE, I ran 17 pounds of boost in my 489" FE in 2007 and 2008, made over 1000 HP on the dyno, took it on Drag Week, ran 9s at the track, etc. etc., without problems.  BUT, that engine had a Shelby block.  I don't think I'd trust any stock FE block at that power level unless it was filled.

[GerryP]

...BUT, that engine had a Shelby block.  I don't think I'd trust any stock FE block at that power level unless it was filled.

I might not be remembering this correctly, but isn't the Shelby block architecture that of fastening the heads not at the deck, but in the crank bulkhead/webbing?  If that's the case, then there isn't much chance cylinder pressure could cause the deck to lift since the deck only positions the sleeves.  I'm not sure even a fully-filled FE block with eight sleeves would be strong enough to stay together.  As Randy pointed out, furnace brazing is the only solution, but that's kind of an absurd solution if this isn't a concours restoration.

[NIsaacs]

My son bought this block....

http://fepower.net/simplemachinesforum/index.php?PHPSESSID=60oa9bu31o5t4u8t89qppqb807&topic=5564.msg79342#msg79342

[wayne]

I think super stock guys used to sleeve 427s down to 428 until nhra said no i seen some in Carl Holbrooks shop.

[MeanGene]

Yep, that's how I learned about it many years ago, IIRC Crazy Nate did it too