[L79racer]

What is the weight difference between an Iron LQ4 and an aluminum LS3 block?

 

[daniel6718]

80 pounds or so would be my guess, think all aluminum blocks and iron are about the same

 

[Gary Anderson]

Scoggins-Dickey catalog ppg181

LS Block reference Block only-

LS1/LS6 - Aluminum - 110#

LQ9/6.0L - Cast Iron - 170#

LS2 - Aluminum - 110#

LS3/L92 - Aluminum - 110#

LS7 - Aluminum - 110#

C5R - Aluminum - 120#

LSX - Cast Iron - 225#

LSX Tall Deck Cast Iron - 250#

Your Pal, Gary

 

[L79racer]

Thanks. Only 60lbs difference. I will assume the iron block is much stronger.

 

[fastluv]

My bro works at a machine shop and weighed my bare 2001 lq4 vs his 98 model std deck 4 bolt 454 bbc. The ls was 200 and his bbc was like 220. A 4 bolt 350 is 160 btw.

 

[qwiknotch]

my car picked up 90 lbs with my lq4 over my ls2 block with no changes except the block

 

[tkimrey]

An lq4 block is listed as 88 lbs. heavier in a book I have.

 

[stage20]

i have weighed both an ls1 camaro block and a lq4 iron block and there was a 98 pound difference.