250 to 350 swap?

Ok well I have my engine built and going from a 250 w/glide to a 350 w/th350 short shaft. I have the new mounts for the block and got a new trans poly mount. but do I need anything for the frame mount? and will the drivehshaft be ok?

i just did a similar swap. i bought new frame mounts. i put the original tranny back in, so i cant help you there.

drive shaft will be fine, helped a friend swap a 396/th350 into his 73' with a 250/pg.

You need new frame stands thats about it.

When I did my 72 6+glid to sbc + T350 I had no problem reusing the 6 stands and driveshaft.Good luck with the swap.

changing the front spring would be good too.

yup, coil springs for a 6 are not as strong as the ones for a sbc V8.

Regards.

Don't worry about changing the springs unless you need to anyway. The small block doesn't weigh that much more, and some of the 6 cyl spring rates were actually stiffer than some of the V8 springs.I would wait until your swap is done and see what your height/handling and ride quality is.

From memory BBC 675 LBS
SBC 550
I6 450

Well, i once did that swap of 6L to V8 and had to change coil springs, that´s why i put that comment.

just my 2 cents.

Regards.

my car sat high with the stock 6 cylinder springs after putting my small block in. cut 1 1/4 coil out. i also like my car to sit low though. you should put a stick in it