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#2382583 - 10/05/17 04:27 PM Re: Aftermarket RB Block [Re: JERICOGTX]
Cab_Burge Offline
Too Many Posts

Registered: 08/23/03
Posts: 29719
Loc: Bend,OR USA
I know a well known 10.5 heads up racer that did that with a aluminum block and had issues with ring seal and crankcase pressure on the data logger. He switch to a cast iron block and went faster work
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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2382592 - 10/05/17 04:48 PM Re: Aftermarket RB Block [Re: 10sec440]
pittsburghracer Offline
Slowride

Registered: 02/02/05
Posts: 11964
Loc: PA.
I have to laugh out loud when I hear about bad ring seal on aluminum blocks
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1970 Duster
Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23


Untitled by John Cadamore, on Flickr





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#2382995 - 10/06/17 01:19 PM Re: Aftermarket RB Block [Re: pittsburghracer]
Cab_Burge Offline
Too Many Posts

Registered: 08/23/03
Posts: 29719
Loc: Bend,OR USA
Laugh all you want, I have heard the same results from many heads up west coast racer, power adders included work shruggy
80 to 130 HP loss(700 + and above HP) on engine combination with all the exact same parts being transferred from a iron block to a aluminum block with or without fill shruggy
Bottom line now is we have no good source of both types of RB or B block today, aluminum or iron whiney


Edited by Cab_Burge (10/06/17 01:19 PM)
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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2383283 - 10/07/17 12:53 AM Re: Aftermarket RB Block [Re: 10sec440]
camastomcat Offline
top fuel

Registered: 04/12/05
Posts: 1980
Loc: Salt Lake City
I have 6 rebuilds on my 572 aluminum World block, it leaks 0-2% and did after 142 passes with Predator heads. I also have a 604 Predator on a steel block, with 2 carbs and more camshaft. It won't keep up with the 572 with one because of weight. Not much more I can say. You won't make up for 150 pounds of weight, bottom line.

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#2385665 - 10/11/17 01:34 PM Re: Aftermarket RB Block [Re: 10sec440]
Al_Alguire Offline


Registered: 01/20/03
Posts: 16303
Loc: Rockville MD & Las Vegas
Well we run an aluminum block in the heads up car and will take the weight saving ANY day over the minimal HP cost from any minor ring seal issue. We used both and there is a VERY VERY VERY tiny amount of difference in power. More than offset by the lower weight of the block. In fact a new Dart ALUMINUM block was just ordered for it a couple weeks ago as it will be going to a much shorter deck height for next year. Also ordered was another block for a S/G racer for the same reason, the weight. Everything will be transferred from the old 582, rotating assy etc and headed to the dyno. I don't expect to see more than a 5hp difference.
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#2385680 - 10/11/17 01:54 PM Re: Aftermarket RB Block [Re: 10sec440]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 10394
Loc: So. Burlington, Vt.
When it comes to a BB Mopar....... I'll take the 150lb weights saving from an aluminum block every time.
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68 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60' PRH is a Comp Cams W/D......competitive pricing on entire line. Custom cams available. ** dealer for Indy Cylinder Heads **

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#2386092 - 10/12/17 12:48 AM Re: Aftermarket RB Block [Re: Al_Alguire]
HOTMOPR Offline
mopar

Registered: 05/25/11
Posts: 504
Loc: Rochester, Wa
Originally Posted By Al_Alguire
In fact a new Dart ALUMINUM block was just ordered for it a couple weeks ago as it will be going to a much shorter deck height for next year.


I assume this is not a mopar block?
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63 Savoy 440 727 street car
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#2386276 - 10/12/17 12:06 PM Re: Aftermarket RB Block [Re: 10sec440]
Al_Alguire Offline


Registered: 01/20/03
Posts: 16303
Loc: Rockville MD & Las Vegas
Yes a Chevy deal..FWIW I have four engines all with aluminum blocks and wont go back to iron...
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"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"

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#2386322 - 10/12/17 01:07 PM Re: Aftermarket RB Block [Re: 10sec440]
dvw Online   content
master

Registered: 03/16/06
Posts: 6584
Loc: MI, usa
My car has a very nice late Mega Block, 4.505" with bushed lifter bores. I'd love to have a nice aluminum block.
Doug

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#2386341 - 10/12/17 01:51 PM Re: Aftermarket RB Block [Re: Al_Alguire]
JACK1440 Offline
enthusiast

Registered: 09/27/09
Posts: 395
Loc: MD
Hey Al, I haven't spoken to you. Finally got down the track once. Popped a rod cap off and beat up two bores as well as trashed a crank. Well... after investigation we found a oil system problem in my new aluminum block (sound familiar?) Turned out there is a feature off location which connected the intake and exit of the oil pump. Once it got rpm on it she starved for oil. Still working it out with the block manuf so I'll keep names out of it for now.

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#2386745 - 10/13/17 09:15 AM Re: Aftermarket RB Block [Re: dvw]
SILVER67 Offline
super stock

Registered: 02/04/06
Posts: 730
Loc: Liverpool, NY
Originally Posted By dvw
My car has a very nice late Mega Block, 4.505" with bushed lifter bores. I'd love to have a nice aluminum block.
Doug


Have the aluminum 4.5 bore version of your iron World block in the basement.
Thing can't even weigh 150.
Mike
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Competition Wedge Engines Brewerton, NY

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#2386782 - 10/13/17 10:07 AM Re: Aftermarket RB Block [Re: 10sec440]
dvw Online   content
master

Registered: 03/16/06
Posts: 6584
Loc: MI, usa
Mine isn't a World, It's a late Mopar Mega Block. 270lbs
Doug

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#2386816 - 10/13/17 10:38 AM Re: Aftermarket RB Block [Re: 10sec440]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10183
Loc: Marion, South Carolina [><]
I have a World cast iron hemi block in the shop and holy crap is that thing a tank!

My KB hemi block is about 140 lbs if I remember right. I'll take the aluminum block all day every day over cast iron.
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CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 446" w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'01 Ram 2500 QCSB 4x4 Cummins...toy hauler
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#2386822 - 10/13/17 10:49 AM Re: Aftermarket RB Block [Re: an8sec70cuda]
DoubleD Offline
top fuel

Registered: 01/22/03
Posts: 1783
Loc: NE Ohio
World cast iron hemi block is 325+ pounds its a hefty thing

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