View Full Version : what's the difference?

10-04-2004, 08:05 AM
Does anyone know the weight difference between a big block chevy iron head and a small block chevy aluminum head? Iím thinking about swapping to save some weight.

10-04-2004, 09:08 AM
B/B iron to S/B al head is at least 200lbs. Heads alone are 75lbs. Then you have the LS1 swap, that is another 150lbs. off the front clip.

Here are exact figures:SMALL BLOCK
all iron small block 520 lbs.
alum heads w/iron small block 480 lbs.
all alum motor 389 lbs.

all iron BB 754 lbs.
alum heads with iron block 660 lbs.
all alum BB 501 lbs.

So, B/B iron head to S/b al head difference is 274lbs. :eek:

10-04-2004, 09:20 AM
What Iím reading is if I swapped to an ls1, Iíd shave off 365 lbs?

Holy Hell!!!

10-04-2004, 10:51 AM
Guess you have a new project. Don't forget when you are fabbing mounts you might as well set the motor back a few inches for some more weight distribution advantages.