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Original Message
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| If it's a 1966-later engine... |
| By Dave Shoe - 06/26/2003 10:57:45 PM; IP 216.243.176.34 |
...you can look at the crank flange.
Actually, I'm nost sure exactly what year the change was, but crankflanges look the same for all cast FE cranks up until about 1965 or 1966. At this time the 428 showed up, causing a change in the design of the cast flange which the 390 crank inherited.
The change was the half-circle cutout of about an inch diameter and 1/2" deep (near the 1/4" square notch found on all cast FE crank flanges) so that the flange would not interfere with the drill bit which hollowed out the rear crank throw.
Short stroke FEs required the flange be cut in order to let the drill bit pass, but longer stroke FEs did not need to modify the flange. Early 390/406/427 cast cranks did get the half-circle cut into the flange, but later 390/427 cranks did not. 428 cranks never got the half circle cut into the flange.
Note that all 332/352/360 cranks got the half-circle cut.
Another way is to look for the aluminum ID tag on the intake manifold, often times at the coil mounting hole.
Also, if it's a mid-70s FE, 4 barrels were all 390s (from F150 to F450 trucks) and 2 barrels were either 360s from any pickup, or 390s from F100 pickups. Use the crank flange to be certain, but the 4-barrel is an easy inspection if it's present.
This info does not refeence the FT engine line of F500-F800 series trucks.
You can see the half-circle cutout if the crank is roughly near TDC and the inspection cover of the bellhousing is removed. At this position the square notch on the flange is straight down and the half-moon is a little closer to the drivers side.
JMO,
Shoe. |
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