well i know the saying, theres nor replacement for dsiplacement....

i found a good running low mileage 400 small block, its from the 70's, bone stock...

150 bux...now my 86 d100 is original 318 with a 727...

my question will it be worth it? or rebuilt the old 318

 

Will it be worth it? That is a very subjective question and the answer is in the eye of the beholder. What are you trying to gain by changing the engine and what final use do you have for the truck?

 

well i just want a mild motor in it..nothing fast...i just figured build the 318 a little..vs buyin the parts to swap to a bb

 

I've often heard that the 400 was kinda the black sheep of big blocks. More of a dog than a runner... with that said, 400 cubes are 400 cubes, but then again, it may not be worth the hassle. Keep in mind you'll need a big block tranny behind it too.

 

Plus, I don't know about you, but if your truck is your daily driver like mine is to me, I couldn't afford to feed a big block. The 318 is thirsty enough.

 

Swapping in a big block can be expensive. You can save a lot of time and money by getting a motor that is in good running condition and the matching transmission in like condition. With that being said, and money is no problem, here is a previous thread with some links that may be helpful.

https://dodgeforum.com/forum/1st-gen...-383-swap.html

 

fast five oh: Is this a 400 small block or a 400 big block? You have talked about both in this thread.

 

its a 400 bb

i think after reading all the replies ill just maybe pull my 318 an hope its not to far gone, an just do a bottom end rebuild