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454 BBC Block
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DRR Trophy
posted
I have a 3999289 P block that has been bored out .060. I have been told that it's possible to go out to .120, I just want to know if it can be bored out to .090 over?
 
Posts: 9 | Location: Flint, MI | Registered: October 24, 2010Reply With QuoteReport This Post
DRR Pro
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Sonic check the cylider Walls is only way to know how big it can go.
 
Posts: 2003 | Location: at the track | Registered: May 09, 2007Reply With QuoteReport This Post
DRR Pro
Picture of HS professor
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quote:
I have a 3999289 P block that has been bored out .060. I have been told that it's possible to go out to .120, I just want to know if it can be bored out to .090 over?



As Green1 stated, sonic testing is the only way to really know. I have two "289" blocks and both would be stretching the limits at .060" over. My machinist prefers thick cylinder walls over a slightly larger bore, I have a few blocks he doesn't even really like at .030" for a decent effort race engine.

Keep in mind though, I wanna go 600 runs at least and this time around, I'm shooting for 800-1000 runs before a freshen up. Most of the people I know that go big on 454 blocks don't sonic test them and don't get nearly that many runs outa their stuff.
 
Posts: 1050 | Location: Monroe twp nj | Registered: December 05, 2005Reply With QuoteReport This Post
DRR Sportsman
Picture of FootbrakeJim
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I have a 289 block, that the machine shop who sonic tested it, said it would easily be good for +.100" overbore. I went .060 to be safe. Later on, a dropped valve nicked a cylinder pretty good, so I had that bore sleeved. Now I am thinking about going to the +.100 overbore. How thick are the sleeve walls to begin with? (Does a sleeve for a 454-based engine begin with a 4.250" bore, and is then honed or bored to match the target bore size)?


Dan "Jim" Moore
Much too young to feel this damn old!!
 
Posts: 486 | Location: Dallas, TX  | Registered: December 05, 2002Reply With QuoteReport This Post
DRR Sportsman
Picture of TD3550
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While you have it Sonic checked, pay close attention to cooling jacket scaling. Specifically at head bolt area. Have had some on these early blocks pull the threads right out of the deck.
Has to do the Time-Sert deal. Like 4 on one side and 3 on the other.
 
Posts: 397 | Location: Under a Truck | Registered: August 23, 2013Reply With QuoteReport This Post
DRR S/Pro
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If your machinist used a .090" wall sleeve then there should be approximately .060" of sleeve thickness left with a 4.350" bore.

If he used a sleeve based on the stock 4.250" bore the sleeve walls will only be .040" with a 4.350" bore.

.090" is kinda the norm because there isn't much original cylinder wall for support left with a .120" wall sleeve.

But either way, I'd be inclined to NOT use a sleeved stock block with a 4.350" bore.

You can usually buy a .060" over block pretty inexpensively. BUT try to buy it with the understanding it will sonic check OK for a 4.350" bore.

Good luck with your project...



.
Dave


I'm looking for a BBC blower manifold to buy



Living to serve mankind....
 
Posts: 3171 | Location: Planet Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of Ron Gusack
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We used to fill 4" stroke blocks with 6.135 rods to add some stiffness on blocks that checked a little thin. That was in the 80's with earlier, maybe better, blocks. Is filling a block an option for a marginal wall block these days?
 
Posts: 258 | Location: Maryland | Registered: January 23, 2007Reply With QuoteReport This Post
DRR Pro
Picture of Bruce Williams
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Dave there are a couple of blower intakes on racingjunk.
https://www.racingjunk.com/Int...offset=3&from=search


Bruce Lee Cool

Experience is what you get when you don't get what you want.
 
Posts: 1925 | Location: Chandler Arizona | Registered: August 11, 2005Reply With QuoteReport This Post
DRR S/Pro
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quote:
Originally posted by Bruce Williams:
Dave there are a couple of blower intakes on racingjunk.
https://www.racingjunk.com/Int...offset=3&from=search



Yeah I saw that one Bruce...If I don't find one at the Long Beach Race Parts swap meet this Sunday I'll probably buy that one. Not exactly what I'm looking for but I guess BBC blower manifolds are rare now days..... Smile



.
Dave


I'm looking for a BBC blower manifold to buy



Living to serve mankind....
 
Posts: 3171 | Location: Planet Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Pro
Picture of Bruce Williams
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quote:
Originally posted by imakehp:
quote:
Originally posted by Bruce Williams:
Dave there are a couple of blower intakes on racingjunk.
https://www.racingjunk.com/Int...offset=3&from=search



Yeah I saw that one Bruce...If I don't find one at the Long Beach Race Parts swap meet this Sunday I'll probably buy that one. Not exactly what I'm looking for but I guess BBC blower manifolds are rare now days..... Smile

What exactly are you looking for?
There not rare.
Just add to cart Big Grin


Bruce Lee Cool

Experience is what you get when you don't get what you want.
 
Posts: 1925 | Location: Chandler Arizona | Registered: August 11, 2005Reply With QuoteReport This Post



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