230 inline 6 to a 400 sbc...give it to me straight

[montefreak]

was just wanting to know exactly what i will need to do to go from a 250 inline to a 400 sbc...i am about to start this project and i know i can rely on you guys on here...please give it to me straight....motor mounts??? i plan on using a 400 turbo tranny..short shaft....will i need to relocate the rear tranny mount???

thanks for all your help!!!!

[NicoSlam]

I'm currently in the process of doing the same on my 69SWB but with a 350. engine mounts and their location can remain the same. The wiring will need to be modified if you were not running and HEI on the 250. Also, on my 250, the alternator was on the drivers side and for the 350, it was on the pass. side. Radiator Hoses will need to be changed along with the radiator and fan shroud. I'm not sure on your T400 as I kept the 3speed so I didn't have to modify from the tranny back.

[ol_skool_chevy]

Originally Posted by NicoSlam

I'm currently in the process of doing the same on my 69SWB but with a 350. engine mounts and their location can remain the same. The wiring will need to be modified if you were not running and HEI on the 250. Also, on my 250, the alternator was on the drivers side and for the 350, it was on the pass. side. Radiator Hoses will need to be changed along with the radiator and fan shroud. I'm not sure on your T400 as I kept the 3speed so I didn't have to modify from the tranny back.

love to hear how well your 3 speed holds up with that 3 speed....I have one Im thinking of using

[Shyguy]

My son is running a 3 speed muncie behind a slightly modified 454 with a posi without a problem. He is not real easy on it either.

[raycow]

Originally Posted by montefreak

was just wanting to know exactly what i will need to do to go from a 250 inline to a 400 sbc...i am about to start this project and i know i can rely on you guys on here...please give it to me straight....motor mounts??? i plan on using a 400 turbo tranny..short shaft....will i need to relocate the rear tranny mount???

You can keep your present front mounts. If your truck is automatic now you will have to move the crossmember back. The frame rails should already have holes at the TH400 location. If you have a manual tranmission you will have to remove the crossmember that is under the bellhousing and install a new one for the transmission.

Ray

[montefreak]

hey ray...thanks for the info...my truck currently has a four speed manual tranny.....

[Jacfourteen]

If you're trading out the tranny too you might as well move the engine to the forward holes and use the small block towers. Like stated above you will need to get rid of the crossmember your bell housing is mounted to now and get a auto tranny crossmember. You will have to run the auto linkage and shifter and you can just seal up the hole where your shifter is now or you could even change to a low hump floor. Exhaust will have to be addressed, when I changed mine I just scrapped the stock pipes and had a shop run all new dual exhaust. also you will need to find a different driveshaft or get yours modified. Hope this helps you out.

[montefreak]

hey guys,

i can use all the help i can get...i wasnt sure of the engins mount location..ive heard many different views on were they should be..i guess i should just dive in and then my questions can be asked as i go....thank you all again for your help...i can always rely on this site for help

[Jacfourteen]

Originally Posted by montefreak

hey guys,

i can use all the help i can get...i wasnt sure of the engins mount location..ive heard many different views on were they should be..i guess i should just dive in and then my questions can be asked as i go....thank you all again for your help...i can always rely on this site for help

If you were keeping the current tranny I would say just use your stock towers, but since you are swapping to the auto get some small block v8 towers and mounts. There are 3 holes in the top of the frame for the motor towers. Right now with the I6 towers the 2 rear holes are being used, with the small block towers the front 2 will be used. You will use the stock small block motor mounts that these trucks used, they have three holes that bolt to the engine, and one hole that bolts to the tower. I will get you a link to the mounts and towers so you can see what I'm talking about.

[Jacfourteen]

Here is what the small block v8 stand looks like, it's the one on the right with the small hole in it (if you are wondering the other one with big hole is for v6).



These are the mounts that you need for the small block. Here is a link for them, they cost $7 per side, http://www.autozone.com/autozone/par...3627_195313_0_



Hope this helps you out.