Switiching TPI in for LG4

Reply Subscribe

Thread Tools

Search this Thread

06-13-2013, 10:41 AM

85Irocbuild

Junior Member

Thread Starter

Join Date: Dec 2012

Location: Iowa

Posts: 87

Likes: 0

Received 0 Likes on 0 Posts

Car: 1988 Gray Iroc

Engine: 305 TPI

Switiching TPI in for LG4

Hi all,

I am going to buy a 1987 Iroc that has the 5 speed transmission and the 4 barrel LG4. At the moment, I have a donor 1985 Iroc that has the 305 TPI. Would there be any problems switching in my 1985 305 TPI and ditching the LG4? Would the TPI engine hook up fine to the 5 speed? I have heard that the 1985 TPI engines are a little different from the other year TPI engines, so I don't know if it would work in a 1987 Iroc 5 speed.

Reply Like

06-13-2013, 10:47 AM

Tuned Performance

Sponsor

iTrader: (92)

Join Date: Dec 2004

Location: Mile High Country !!!

Posts: 15,481

Likes: 7

Received 676 Likes on 597 Posts

Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: Switiching TPI in for LG4

The 85 intake would need the center holes elongated to work on the 87. The 87 is a one piece rear main seal engine so you would need a new flywheel. the 85 ecm is to the greatest.