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#1359 06/23/2004 12:49 AM | Joined: Feb 2004 Posts: 110 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2004 Posts: 110 | My 65 C10 has a transmission problem (jumps out of second under accereration). So, I have to get up to about 25mph and shift to third (three on a tree) and it pulls very will at low speed in high gear. Also I have a 4:11 differential which helps. I will fix it one day, but out of curiousity I wondered what size 6 banger I have and I checked it with butlers list that I print-ed up a while back (mortec only covers v8s) and I can't find my block casting 3921968 on their list. 3921970 is a 292, but I don't think that the closeness of the numbers has any meaning. Anyone have any input? I would appreciate any info.
Truck Tinker | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Look at the front motor mounts. If it's a 250, they will be directly across from each other. The mounts on the 292 are offset, with the passenger side being toward the rear of the truck. The harmonic balancer (crankshaft pulley) is much larger on the 292,also, but you'd need the two engines side by side to do a comparison. Mounts are the simplest way to identify the 292 quickly.
Jerry
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| | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The 292 is also taller than a 230/250 by a couple inches.
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#1362 06/23/2004 11:03 PM | Joined: Feb 2004 Posts: 110 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2004 Posts: 110 | Appreciate the info fellows. I measured from the center of the mount to the back of the bell housing and it was the same distance on both sides so, it must be the 250. It has GM66 under the casting number and LMC truck parts catalog gives a 250 in its list of engines for 1966 and I also know that the engine came out of a 1966 longbed. With the pulling power it has, if it was a 292 I probably wouldn't need anything but third gear. (just kidding,) but I bet a 292 does have a lot of power for an inline 6. Again, thanks for the info.
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