Big Block Stew
11-12-2001, 03:26 AM
#1
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Big Block Stew
I have a steel 454 crank out of a truck motor that self destructed and spun a main. I think the damage to the saddle may be too much to fix. So, I have this 454 crank. Now I also have a 402 block out of a 70 pickup. Would it be possible or even desireable to put this crank in the 402 block? 383 small blocks seem to work really well, how about a smaller displacement BB stroker? what might he displacement be? I have already had the crank welded and re-ground so it's good to go. Might this be a fun motor for a swap into my 75? When I do the math I come up with about 420 CI.
[Modified by BubbaJJ, 1:49 AM 11/12/2001]
[Modified by BubbaJJ, 1:49 AM 11/12/2001]
11-12-2001, 11:47 PM
#3
Le Mans Master
Re: Big Block Stew (BubbaJJ)
Seems reasonable to me.
My math comes out to about 427 inches - kinda cool...
I guess you might have to worry about the rod clearance,
although I think by 70 all the blocks are OK for 454 cranks???
My math comes out to about 427 inches - kinda cool...
I guess you might have to worry about the rod clearance,
although I think by 70 all the blocks are OK for 454 cranks???
11-13-2001, 06:25 AM
#4
Le Mans Master
Re: Big Block Stew (BubbaJJ)
All Big blocks except 454's are interally balanced. 454's are internally and externally balanced in that they have special flywheels and harmonic balancers to complete the balance of the engine. You would also need to need to use pistons with the correct wrist pin location it handle the longer stroke.
[Modified by silvervetteman, 4:27 AM 11/13/2001]
[Modified by silvervetteman, 4:27 AM 11/13/2001]
11-13-2001, 12:04 PM
#5
Le Mans Master
Re: Big Block Stew (silvervetteman)
Here are some stats on the 402 block-
Mark IV
Deck Height = 9.800 (standard, short deck)
2 & 4 bolt versions were sold
Cam location is "stock"
Bore range = 4.125 to 4.186
The bore range also varies with cylinder wall thickness, and this varied with casting number.
Sonic testing is used to determine over-bore potential when in doubt.
The 396, 402, 427 stroke is 3.76... the 454 is 4.00 (other block numbers are 4.250 and 4.600)
Don't know if the 454 crank/rods will hit anything in the 402 block.
Dip Stick position and clutch linkage mounting boss may also be an issue
Here's another interesting tidbit-
396 and 402 cranks had a 7/16 #3 counterweight, the 427 had a 7/8 #3 counterweight.
Motorbooks International has a book entitled "Chevrolet Big Block V-8 Interchange Manual".
They describe interchanging parts among the different big blocks. It's a good reference.
Great reading for a gearhead.
Mark IV
Deck Height = 9.800 (standard, short deck)
2 & 4 bolt versions were sold
Cam location is "stock"
Bore range = 4.125 to 4.186
The bore range also varies with cylinder wall thickness, and this varied with casting number.
Sonic testing is used to determine over-bore potential when in doubt.
The 396, 402, 427 stroke is 3.76... the 454 is 4.00 (other block numbers are 4.250 and 4.600)
Don't know if the 454 crank/rods will hit anything in the 402 block.
Dip Stick position and clutch linkage mounting boss may also be an issue
Here's another interesting tidbit-
396 and 402 cranks had a 7/16 #3 counterweight, the 427 had a 7/8 #3 counterweight.
Motorbooks International has a book entitled "Chevrolet Big Block V-8 Interchange Manual".
They describe interchanging parts among the different big blocks. It's a good reference.
Great reading for a gearhead.