Anybody have any idea if piston from a 351C will work with a 400M. I know the bores are the same as well as the compression heights. What I want to know is if the piston skirts are going to come down and smack into the crank-counter weights??

 

Don't know about the skirts, but the wrist pins are a different size.
You'd have to bush the rods to install the smaller pins.
I'd go with the TMI pistons, its what I did.

 

TMeyer, Inc. - Machine Shop Prices

Every piston you might need for a 400...

 

yep i have.
i use 351c forge piston in my 400 with boss 302/351 heads back in the mid 80's. you have to bush the small end of the 400 to fit the 351C and then us the 351C fullfloating style pistons. works great ! i would spin mine up to 6500 rpm with out a problem.

 

You would also have to machine the lock groove onto the piston & get locks. Probably be cheeper and less trouble to just get Tims pistons.

 

well the pistons come that way already when you order the 351C WITH full floating WRIST PINS??????

 

He never said in his post that the pistons in question were for floationg pins. Standard 351 pistons were press fit.

 

Why is this a disscussion? if you wanna complicate your life go ahead and use some 351c pistons, but cmon being there almost any usuable 400 piston available from TIM? even for performance and compression.......

 

One choice for a forged piston... and 2 choices for "hyper" pistons.. Im looking into building another 400 and stuffing it in some other brand truck.. Bushing the rods would be nice because then there are alot more choices for forged pistons, and floating pistons are oh so very nice when it comes time to replace them!!!

Just make sure to check the compression height.. would suck to throw a 351c piston in there that sits lower in the hole!

 

what are you doing with this engine?

 

Me? ............?

 

well i was just wondering if he needed forged or not. if hes not turning 6000 rpm(4000 fps piston), his 400 will be fine with hyper pistons. he probably isnt super charged but he may be running nitrous. as long as you are capable with a timing light/carb adjustment and arent racing or on no2, hypers will be fine.

 

Hmm hypers could be good for 7k rpm.... along with the stock rods. Nice power can come up in a 400 at 5k or 6k along with a very wide rpm range due to the 4" stroke, so why the need to go above it or in this case use forged? I agree with bradley, hyper will be good for him...