View Full Version : dimension difference between big and small block chevy
fsdragster
06-21-2009, 06:36 AM
besides the weight of the big block is the overall width or length different between them. car had a small block with front plate and looking to go bigblock. thanks
Tod74
06-21-2009, 07:43 AM
They are a lot wider. It is the cylinder heads more so than the block.
Drtmod5
06-21-2009, 07:57 AM
They are also @ 3-4" longer in front of motor mounts. I switched mine a couple seasons ago & everything bolts up the same except the front is now closer to the radiator.
fsdragster
06-21-2009, 08:47 AM
so the clearance to the firewall is the same its the front that changes. my car came with a small block plate. do i alter that or just buy a new one
hammertime
06-21-2009, 08:59 AM
so the clearance to the firewall is the same its the front that changes. my car came with a small block plate. do i alter that or just buy a new one
you'll have to buy new
desoto30
06-21-2009, 11:12 AM
^^ & move it forward 2"
hammertime
06-21-2009, 11:14 AM
^^ & move it forward 2"
x2 they are 2 " longer
desoto30
06-21-2009, 11:17 AM
Just thinking, sometimes you are able to cut out the front plate to accomodate the BB. sometimes not depends how the first is made.
fsdragster
06-21-2009, 02:58 PM
THANKS FOR ALL THE EXPERT ADVISE. HAPPY FATHERS DAY TO ALL. FRANK