brent4a

I have a 1990 Formula with the 305 TPI and 5 speed. I am thinking of upgrading to a 350 , but want to keep the TPI. The 305 has 165,000 miles and runs OK. Is it worth rebuilding or is it worth swapping to a 350, what 350 should i use and how much modifying would i need to do to the computer controled items? Would I be able to keep the 5 speed?

demonchild

many many ppl have donethis swap and wrote about it. tyr the search button. youll be an expert by the time ur done reading.

brent4a

Been looking for hours, no match yet for what i am looking for.

Guest

Everything from your 305 will bolt up to a 350 that has the 87-up heads and one piece rear main seal. Just use your existing sensors and ecm. Unless you make major changes to the 350, the 305 programming and injectors will work fine.

demonchild

there summed up in a couple of words. if ur doing it yourself i would suggest having someone there that knows wtf they are talking about.

brent4a

What about the 5 speed ? Can I use the 305 fltwheel or do I need a flywheel from a 350 ?

Guest

305 and 350 flywheels are the same, the only issue is the rear main seal. Thats based on the year, not the cubic inches. You need a one piece rear main seal 350 if you dont want to replace the flywheel. That'd be 87-up. Some 86's on the 350's had a 2 piece rear main (pickups mostly) so 87 up is a safe bet.

MdFormula350

350 tpi 5 speed would be nice, go for it!

F0xBody50

A member of a local IROC-Z Crew has a 350 TPI, 5-spd setup..

It is.... NICE

-LJ