what does it take to make a 351m a 400?
and how much better/worse is it?
thenka for any help.
351 to 400
Started by
79-4x4
, Dec 29 2005 12:03 PM
6 replies to this topic
#2
Billz4x4z
-
- Members
-
- 107 posts
F-Series Maniac
- Location:Carnesville,GA
- Interests:Trucks,4 Wheelin,Workin on Stuff,campin,the outdoors,NASCAR,meetin new people to go wheelin with,Truck shows family time
Posted 01 January 2006 - 06:43 PM
Just a matter of changing the crank and pistons is all.what does it take to make a 351m a 400?
and how much better/worse is it?
thenka for any help.
You'll gain some extra power.
If ya don't get hung up once in a while your not wheelin hard enough
#3
dezracer
-
- Members
-
- 5 posts
Where's My Hammer!?!
Posted 08 January 2006 - 04:50 PM
what does it take to make a 351m a 400?
and how much better/worse is it?
thenka for any help.
Put a 460 in instead, it will bolt up to your trans and then u could put in some 3.50 gears and have a sleeper
Dale Aastrom, CA
74 F350 Supercab
390
C6
4:10
Project pre-runner
74 F100-2wd
390-Edelbrock heads, 750 Holley, Hooker Supercomp,4:30 Detroit Locker, Currie 31 Spline, 35"Goodyear M/T, Art Carr shifter, MSD ign. and Distributor, King Coilover shocks
74 F350 Supercab
390
C6
4:10
Project pre-runner
74 F100-2wd
390-Edelbrock heads, 750 Holley, Hooker Supercomp,4:30 Detroit Locker, Currie 31 Spline, 35"Goodyear M/T, Art Carr shifter, MSD ign. and Distributor, King Coilover shocks
#6
a1bummer
-
- Members
-
- 8 posts
Where's My Hammer!?!
Posted 15 February 2006 - 08:38 AM
It's a bit more than just changing the crank, rods, and pistons. If I remember right the 351m and 400 both have the same bore which would make the pistons the same. The 400 has a longer stroke and deck height to come up with the added displacement. What your asking for is what's called "stroking" and engine. The crank from a 400 may fit into the 351m without modification. Then you would have to find the right connecting rod and piston configuration to fit you application. One or the other if not both would have to be aftermarket or modified to fit. If you simply changed the crank and rods the pistons would extend past the top of the deck. And a "Sleeper" is a vehicle that looks mild or slow but really blows the doors off the competition.
#7
badass79f150
-
- Members
- 1 posts
F-Series Newbie
Posted 09 March 2006 - 08:34 AM
you are right about 400 having a longer stroke than the351m but it does also have a bigger bore. the bore on a 400 is 0.40 over what the bore on a 351m is. you might also have to swap the heads because the 400 has bigger intake and exhaust valves than the 351m has. it will be some work i suggest that you do what i did. find a old 400 motor that is complete and has low miles and just buy a rebuild it for about $200.00 and gasket kit.It's a bit more than just changing the crank, rods, and pistons. If I remember right the 351m and 400 both have the same bore which would make the pistons the same. The 400 has a longer stroke and deck height to come up with the added displacement. What your asking for is what's called "stroking" and engine. The crank from a 400 may fit into the 351m without modification. Then you would have to find the right connecting rod and piston configuration to fit you application. One or the other if not both would have to be aftermarket or modified to fit. If you simply changed the crank and rods the pistons would extend past the top of the deck. And a "Sleeper" is a vehicle that looks mild or slow but really blows the doors off the competition.
Reply to this topic
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users
