Windfall $ = Aluminum SBC block? - Chevelle Tech
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post #1 of 68 (permalink) Old Jul 21st, 19, 5:18 AM Thread Starter
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Richard
 
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Windfall $ = Aluminum SBC block?

Got some unexpected money today.
Not a fortune but enough to finish my El Camino, IF I don't get carried away with big ticket items.
I've been wanting an aluminum block to save weight from the very beginning but the cost has stopped me.
Now wondering what the CURRENT assessment of these is?

https://www.billmitchellproducts.com...ere-more-info/

BMP aluminum block, saves $500 with the ductile main caps instead of billet.
I'm only building a 327/333 and not drag racing so if the alloy, hardness, and machining are decent this might work for me?

I know there are several Pro engine builders here.
Not trusting the BMP hype and not rich enough for a new Donavan.

At these gas prices I want it 100+ octane, leaded, and my windshield washed!
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post #2 of 68 (permalink) Old Jul 21st, 19, 9:16 AM
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Re: Windfall $ = Aluminum SBC block?

How about an aluminum LS engine?
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Tighten it till it strips and back it off a quarter turn.
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post #3 of 68 (permalink) Old Jul 21st, 19, 9:27 AM
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Allen
 
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Re: Windfall $ = Aluminum SBC block?

Quote:
Originally Posted by Alwhite00 View Post
How about an aluminum LS engine?

Great idea considering your build, unless you already have a very good set of SBC heads and maybe other good SBC parts.
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post #4 of 68 (permalink) Old Jul 21st, 19, 9:53 AM
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Re: Windfall $ = Aluminum SBC block?

i would say go with a 5.3LS engine;
and sell off your sbc; or hold it for another project...

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post #5 of 68 (permalink) Old Jul 21st, 19, 9:56 AM
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I too have always wanted an aluminum SBC. Is seems the weight saved is offset in lower HP as aluminum blocks must be set up looser to allow for thermal and structural movement. I believe article focused on Dart al blocks.

Bill Jenkins tried factory BBC’s w/o success and went back to ci.
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post #6 of 68 (permalink) Old Jul 21st, 19, 12:46 PM Thread Starter
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Richard
 
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Re: Windfall $ = Aluminum SBC block?

Ahhh, the point of this build is to be a bit Old School, so LS is out of the question.
I already have Eagle crank and rods, $1K custom forged pistons, rebuilt Brownfield heads, new cam & lifters, 4x44 IDF Webers, aluminum flywheel, etc.
So it's going to be a 333" SBC even if I have to use the iron block I already have.
Alloy block might be a bit crazy for a street car but I'm only going to get to do this sort of build once.
NOT drag racing, more like a road-racer.
Want to lower weight for better handling and acceleration with the tiny little engine.

At these gas prices I want it 100+ octane, leaded, and my windshield washed!
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post #7 of 68 (permalink) Old Jul 21st, 19, 1:02 PM
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Re: Windfall $ = Aluminum SBC block?

Do it. There is not much wrong with bmp block. Your not losing much power as this is not a totally best hp type build. The weight savings and the cool factor will make up for the 20hp you should be down if that. FYI big block bowtie blocks used ductile caps and been successfully used over 1000 horsepower. So save the the money there.

RH
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post #8 of 68 (permalink) Old Jul 21st, 19, 7:12 PM
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Re: Windfall $ = Aluminum SBC block?

5k $ for 80 lbs savings.
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post #9 of 68 (permalink) Old Jul 21st, 19, 8:22 PM
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Re: Windfall $ = Aluminum SBC block?

I bought a set of these several years ago https://www.billmitchellproducts.com...appet-lifters/ to use on a project I was working on, and (before I learned the merits of not using straight out of the box) I took them all apart and they were as clean as if I had already been there with solvent and a brush. The valves passed the solvent leakage test, before I took them apart, and there was no casting flash anywhere. Now as I said this was several years ago, so times may have changed, and QC, may be a thing of the past....but at the time I was impressed with the over all quality. Just using my experience as an example....someone else may have a "Horror Story".

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post #10 of 68 (permalink) Old Jul 21st, 19, 8:58 PM
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Re: Windfall $ = Aluminum SBC block?

For this type of build the BMP block should be OK - IF EVERYTHING is checked.

FWIW Brodix has their aluminum blocks on sale through the end of July.

Jason Gore
AKA DragRacer
Naturally Aspriated 450 SBC - 915 HP / 714 lb-ft
3370 lbs
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post #11 of 68 (permalink) Old Jul 21st, 19, 10:13 PM
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Quote:
Originally Posted by artmalibu View Post
5k $ for 80 lbs savings.
Another problem
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post #12 of 68 (permalink) Old Jul 21st, 19, 10:37 PM
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Re: Windfall $ = Aluminum SBC block?

Most builders agree that you'll make less power with an aluminum block due to it not being as strong or dimensionally stable as iron.
Invest the windfall in the market, you'll almost certainly have a better return on the investment.
Or waste it on hookers and booze, it's your call
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post #13 of 68 (permalink) Old Jul 22nd, 19, 12:42 AM Thread Starter
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Richard
 
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Re: Windfall $ = Aluminum SBC block?

Switched to forged pistons from hypers, so the iron block has to be checked for proper clearance later this week.
Not sure it can be adjusted so may have to find another block.
That would be the THIRD iron block.
If I do not get an alloy block I can probably hire some part time help with the bodywork.
The desire for an aluminum block may not be totally rational, but neither is putting this much time and money into a fifty year old mass produced half car - half truck.
We want what we want, no reason required.
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At these gas prices I want it 100+ octane, leaded, and my windshield washed!
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post #14 of 68 (permalink) Old Jul 22nd, 19, 12:57 AM
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Re: Windfall $ = Aluminum SBC block?

Quote:
Originally Posted by Richard/SIA View Post
Switched to forged pistons from hypers, so the iron block has to be checked for proper clearance later this week.
Not sure it can be adjusted so may have to find another block.
That would be the THIRD iron block.
If I do not get an alloy block I can probably hire some part time help with the bodywork.
The desire for an aluminum block may not be totally rational, but neither is putting this much time and money into a fifty year old mass produced half car - half truck.
We want what we want, no reason required.
The clearance difference is built into the piston not the block..........

Mike (Wolfplace)
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post #15 of 68 (permalink) Old Jul 22nd, 19, 7:25 AM
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Re: Windfall $ = Aluminum SBC block?

Quote:
Originally Posted by Wolfplace View Post
The clearance difference is built into the piston not the block..........

You beat me to it This is one big misconception that I run into all the time.

Bill Koustenis
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Waldorf Md


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