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#498260 Tue Jan 27 2009 04:58 PM
Joined: Jan 2009
Posts: 20
New Guy
Hello all, I have a 1955 1st series chevy 3100 with a 4 Speed and I found a L6 6 Cyl. 250 chevy engine, Casting number #3877178. this engine fits GM cars and Trucks 1962-1978. My questions is would my bell housing off my 55 fit?, and would I have to change the front mounting arrangement? Anybody make a swap like this? Thanks in advance for you help.


" Hard Times Don't Last , Strong People Do."
Joined: Apr 2005
Posts: 2,020
Your bellhousing will not fit, in fact hardly anything from the 235 will interchange with the 250. You need the 55-67 V-8 truck bellhousing (also 63-67 6 cyl). The 250 engine has center mounts, pick up a tubular crossmember mount (same as V-8) from any of the aftermarket suppliers.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
rfs56trk #498277 Tue Jan 27 2009 05:26 PM
Joined: Jul 2006
Posts: 79
Wrench Fetcher
What Fred said.
I made this swap recently. The clutch is different, the bellhousing is different. The motor mounts are different. I bought a tubular crossmember from Classic Parts for the engine mount.
I'm assuming you are changing the driveshaft, transmission and rear axle too. But I THINK the original transmission will mate to the 250 bellhousing. I changed tranny and rear axle, so I'm not sure about that.
One other thing. I wanted my bellhousing and transmission to mount in the exsisting holes on the original crossmember. I had to cut my firewall to get the 250 engine back far enough. the back of the head was hitting the firewall. Some of the other guys who have made this swap tell me they didn't have to modify the firewall. Click here for a photo.


God fearing, Gun toting, Constitution loving extremist.
BlueDawg #498484 Wed Jan 28 2009 02:44 AM
Joined: Jan 2009
Posts: 20
New Guy
Thanks guys, I am sticking to the ole 235. The reason to change was that to previous owner or before him had a ton of Bars leak in the block,I don't know the reason and the guy I bought it off of won't call me back. I check the heater core and radiator , no leaks there. All I can think was maybe a head gasket blown. Compression is good 120- 125. I hope I can get it all out by flushing and having the radiator re-rodded and pressure check,


" Hard Times Don't Last , Strong People Do."
Joined: Feb 2003
Posts: 1,368
If something is wrong with the motor find a 261.

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