Big Block and Small Block chevy, How much do they weigh? - Chevelle Tech
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Old Nov 3rd, 05, 7:20 PM
1970-Cloned 1970-Cloned is offline
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Ben
 
Join Date: Oct 2003
Location: Omaha NE
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Default Big Block and Small Block chevy, How much do they weigh?

I have a 1970 Chevelle Malibu Cloned SS. It had a 400 small block with cast iron heads and aluminum intake, since then I have put in a 454 all cast iron with aluminum intake. I want to know the weight difference of a Fully Cast Iron Big Block vs. Small Block. I have tried to find info on the internet but I have not found much of anything. I put big block springs in the front and ever since it feels like I have a big boat ancor in the front of my car. I love the power but I find it is way too easy to bottom out. I am considering Aluminum Heads for the big block and would like to have the small block weight with the big block. Please only respond with weight if you know for sure. Here is what I found for cast iron BB and SB engines

Big Block 685lbs
Small Block 575lbs

How much do Big Block Aluminum Heads Weigh Loaded?

Any Help would be appreciated. Thanks
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Ben Matheny
Omaha, NE
1970 Chevelle
Stock 2006 LS2 w/ Comp XR265HR Cam
TKO500, Hydraulic Clutch
12 Bolt 3.08 w/ Eaton Posi, Superior Axles
Frame off Restoration in Progress Now.
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  #2  
Old Nov 3rd, 05, 10:42 PM
Chevy 70 SS vert Chevy 70 SS vert is offline
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Chas
 
Join Date: Apr 2004
Location: Overland Park, KS (Kansas City)
Posts: 1,139
Default Re: Big Block and Small Block chevy, How much do they weigh?

Get some of the custom made springs for your car. I got my springs custom made for my 70 clone from www.coilsprings.com. No issues with bottoming out and I went from a small block to a 454 (all IRON), no aluminum anything. First set of springs I got, from the generic parts houses, were so stiff I couldn't compress the front end. They had to go.

My new custom springs are also cut for a 1" drop in the front so if they were going to bottom out I would think they would really bottom out.

I also put new bushings in everything up front as well.
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  #3  
Old Nov 4th, 05, 4:34 PM
zookpr zookpr is offline
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Location: North Coast, Ohio, USA
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Default Re: Big Block and Small Block chevy, How much do they weigh?

You could expect to lose about 100+/- lbs!
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Old Nov 5th, 05, 2:46 AM
novaderrik novaderrik is offline
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Derrick
 
Join Date: Feb 2002
Location: Howard Lake, MN, USA
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Default Re: Big Block and Small Block chevy, How much do they weigh?

so, a big block with aluminum heads weighs as much as an iron headed small block?
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  #5  
Old Nov 6th, 05, 7:49 PM
Rain Man Rain Man is offline
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Join Date: May 2002
Location: Sacramento, CA
Posts: 139
Cool Re: Big Block and Small Block chevy, How much do they weigh?

I can tell you this. A 396 bare block weighs about 220 lbs and a 427 bare block will weigh about 10 lbs less. At least that's what I found when I weighed
three pre-1970 blocks.
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