I was talking to a buddy of mine the other day about building a 22r street motor, and he seemed to think there were differences between an 84 and 85 block. Are there any major differences? What is the most common overbore that is possible with an 84 block?

 

1975 - 1980 20R Block
Deck Height 11.280"
Stock Bore 88.5mm - 3.484"
Maximum Over Bore 90.0mm - 3.544"

1981 - 1984 22R Block
Deck Height 11.280"
Stock Bore 92.0mm - 3.622"
Maximum Over Bore 93.0mm - 3.662"
Big Bore Forged Piston Kit 94.0mm - 3.701"

1985 - 1995 22R-22RE "Laser Block"
Deck Height 11.090"
Stock Bore 92.0mm - 3.622"
Maximum Over Bore 93.0mm - 3.6662"
Big Bore Forged Piston Kit 94.0mm - 3.701"


All Toyota 20R - 22R - 22RE engines use the same crankshaft and connecting rods. To accommodate the different deck heights, Toyota changed the compression height (piston pin location).


Crankshaft (Forged)
Stroke All 20R - 22R - 22RE 89mm - 3.5039"
Rod Journal 2.0861 to 2.086" (standard)
Main Journal 2.3614 to 2.13622" (standard)

Connecting Rod (Forged)
Center to center length 5.830"

 

The truck that I have has had a motor swap. How could I tell the difference between an 84 and 85 block?

 

http://www.lcengineering.com/technot...5940c601138c39

its at the bottom of this page.

 

LC Engineering tech notes

'85 on up block will have a boss on the exhaust side (drilled out on the turbo's for oil return)


**edit** damn, beat me by one minute

 

That is exactly what i needed to know guys thanks.