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Author Topic:   Dart Little M
Dirt Full Roller

Total posts: 74
posted November 29, 2005 09:10 AM  
Anyone use a Little m block in their mod?? Any advantages or disadvantages?? Getting harder to find any 350 or 400 standard bore blocks around here......

Dirt Forum Champ
Total posts: 1899
posted November 29, 2005 10:22 AM  
I use one, The advantages are I have a motor with a std bore, so if I want to rebuild it I can more than once before I get walls to thin. I also got a 400 bore with 350 mains, which for my crank set up i needed. The block was just about dead on from the factory, mine had to be line honed, decked(to my spec for this motor), and honed by my engine builder for the pistons. the engine guy told me that most all of them dont even need the line hone.
We chose it because I needed the large bore with smaller mains, also the rpm I am turning I felt that the dart would give me a much more stable enviroment for my motor.
I talked to a local place(not my engine guy, he was out of town for a few months with the gaurds) about doing my block work they said I supplied the block and 1600 for a 400 with splayed caps...but still a stock core. so figured just spend the extra and get a better block.

Dis- weighs alot, i dont know how much more than a stock, but some.

Dirt Forum Champ
Total posts: 2014
posted November 29, 2005 10:59 AM  
biggest disadvantage is weight almost 20# heavier than stock blocks i beleive. But by far stronger, especially compared to a 400 block. If you are building anything serious especially big bore stuff and plan to turn some rpms then you should look into an aftermarket block.

Another option is a chevy bowtie racing block. Kind of like the little m except a lot lighter. not much heavier than a stock block but again a lot stronger and more stable.

Dirt Maniac

Total posts: 170
posted November 29, 2005 10:29 PM  
send this thread to imca please lol

Dirt Maniac

Total posts: 180
posted November 30, 2005 09:46 AM  
i have a motown block. i would use one if you are planning on using any variation of the 400 style engine(406, 421, 434, 377?) before i went to the aftermarket block i had a whole stack of broken 400 blocks...they are quite a bit heavier though. my car is 50 lbs heavier with the motown block and iron eagle heads versus the 377 with stock block and sportsman II heads. and it is all over the frontend.

Dirt Newbie

Total posts: 2
posted December 01, 2005 12:54 PM  
We have ran the same Little M for 3 years now and have had absolutely no problems with it. It survived a broken oil pump one night and still have had no problem. Some guys that we race with are scared of the Little M because they have had oiling issues with them. One thing you have to do is read the supplied instructions on how to restrict them and where. And if you can find a machine shop that has experience with them, use them. Don't take it to someone who is not familiar with it because they will only screw it up and you'll be pi$$ed.

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