engine -tranny swap
Thread Starter
Instructor
Joined: Aug 2007
Posts: 144
Likes: 0
From: new kent virginia
engine -tranny swap
i have a 86 w/ iron heads, with 144,000 on it a friend has a 85 engine -tranny he wants to sell me. any drastic changes between the 85 -86.
do i need the ecm also . any thing else i need to change. thanks for the input
do i need the ecm also . any thing else i need to change. thanks for the input
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
changes
If your engine needs the heads rebuilt, buy a set of later corvette alum. heads, or a set of hi-perf. heads, and keep going. Remember, the overdrive is .6:1. so at 100,000 miles, the engine only really has 60,000 miles. If it was in a truck, you would just change the heads. Change your heads, change the cam, change the lifters, change the timing gears, keep going to 240,000 miles. Then bore it to .060 over
cons
1. the dipstick on on the left hand side,
2. two piece rear main crank seal
3. '86 pan and pan reinforcement strips won't fit
4. original flexplate won't fit
5. block may not have higher nickel or tin content
6. no provisions to drill and tap the roller cam retainer and spyder
7. must use aftermarket roller lifters
Pros
1. 85 came with forged pistons
2. if you get the trans with it, the flexplate is no big deal
3. if you go to roller cam, you need a cam button
4. block is drilled for fuel pump push rod
5. physically, other than the dipstick, externally the same
6. use a regular 85 corvette oil pan or any other pan non corvette
cons
1. the dipstick on on the left hand side,
2. two piece rear main crank seal
3. '86 pan and pan reinforcement strips won't fit
4. original flexplate won't fit
5. block may not have higher nickel or tin content
6. no provisions to drill and tap the roller cam retainer and spyder
7. must use aftermarket roller lifters
Pros
1. 85 came with forged pistons
2. if you get the trans with it, the flexplate is no big deal
3. if you go to roller cam, you need a cam button
4. block is drilled for fuel pump push rod
5. physically, other than the dipstick, externally the same
6. use a regular 85 corvette oil pan or any other pan non corvette
Last edited by coupeguy2001; Dec 30, 2007 at 08:46 PM.
