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Author Topic:   406 or 377
leftturn73
Dirt Forum Racer

Total posts: 81
posted March 20, 2003 01:35 PM
I asked this question a while back, I thought I would ask again. I now have a 400 block not sure which way to go. Build a 406 or 377. I run UMP and IMCA tracks. Any engine combinations you have found to work good with these would be helpful. I run 1/4 to 1/2 mile dirt tracks. Most of the tracks have very good bite only a couple black slick.

Thanks

rico 08
Dirt Freak

Total posts: 372
posted March 20, 2003 09:22 PM
406 is probably better on a tacky track,377 on dry slick,i actually like a 377 better.IMHO

Pickel
Dirt Forum Champ
Total posts: 564
posted March 20, 2003 10:04 PM UIN: 25419780
my opinion the 377 is more durable. I have seen a lot of 406's come apart. I haven't seen too many 377's come apart.

jnewman44
Dirt Full Roller

Total posts: 72
posted March 20, 2003 10:13 PM
Theres on replacement for displacement. A 406 will be better on torque, a 377 will be better on hp, 406 more trackable power, 377 more peak power.

Slam_Shifter
Dirt Full Roller

Total posts: 53
posted March 20, 2003 10:58 PM
We ran a 406 for awhile and I hated it. Could never get it comfortible and could never get comfortible with it. I would go with the 377.

Slam_Shifter

sixwillwin
Dirt Freak

Total posts: 215
posted March 21, 2003 07:44 AM
406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406 406

RACEINMUD
Dirt Forum Racer

Total posts: 76
posted March 21, 2003 05:52 PM
Is there clearance problems with the 377 like the 383. If i'm correct a 377 is a 400 block with 350 crank w/ spacer. Do you use the 400 cr's or 350 cr's.

rico 08
Dirt Freak

Total posts: 372
posted March 21, 2003 09:07 PM
No clearance problems and you get to use the 350 rods.

jnewman44
Dirt Full Roller

Total posts: 72
posted March 21, 2003 10:28 PM
377 uses 350 rods 400 pistons, 406 uses 400 or 350 rods and 400 pistons(special pistons for the 350 rods) longer rods have better rod to stroke ratio.

dadwhisky78
Dirt Roller

Total posts: 14
posted March 22, 2003 07:49 AM
I agree whole-heartedly with slam shifter. We have been much more satisfied with our 377 than fighting with the 406.

leftturn73
Dirt Forum Racer

Total posts: 81
posted March 23, 2003 05:27 PM
Thanks for all your feed back. I thought of some thing else that may or may not change thoughts of everyone. I had thoughts on running this engine on long tracks. So with that said 377 or 406.

Again thanks for all the feed back its been a great help.

Dustejr73
Dirt Full Roller

Total posts: 65
posted March 31, 2003 09:08 PM
in my opinion if you are going to waste the time on the POS 400 block you might as well have a 406 instead of a 377, you have heating problems with both. if you dont use a 406 i would use a 383 or some other combo with the 350 block. i always run 406s and had to go to a world products block this year...i broke tooo many stock 400 blocks.......very expen$ive.

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