from 400 4bolt 511 casting block

block
3951511....400...70-73...4...Some replacement blocks had 2-bolt main caps

crank
3951529....400.......cast....large journal....3.75" stroke

heads
3973493....71-72...400..........76cc chamber 



from 2 bolt complete motor

block
330817.....400...72-80...2

(note, this block uses 2 freeze plugs per side)


crank (same)
3951529....400.......cast....large journal....3.75" stroke



heads
333882.....74-80...350/400......76cc chambers

(note: the GM "882" heads were recently evaluated in a magazine writeup and were 
"the best flowing of the early iron heads".) I think I will use them on the new 
motor for budgetary reasons.

More info:
GM 882 iron casting
Port: 151 cc
Chamber: 76cc
Valve sizes: 1.94 / 1.50
I flow at 0.400: 194 cfm
E flow at 0.400:  159 cfm
E/I: 73%

Compare w/ World products SR torquer:
Port: 170 cc
I flow at 0.400: 205 cfm
E flow at 0.400:  145 cfm

Compare to GM L98 Iron: 
Port:163 cc
I flow at 0.400: 186 cfm
E flow at 0.400:  140 cfm

Compare to GM LT1
Port: 170 cc
I flow at 0.400: 213 cfm
E flow at 0.400:  142 cf