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Are the K frames Different from Eng to Eng?
Listing of k frames for 1970-71 with the applications.
Generally, V-8 k frames are the same with some differences (skid plates for the HP engines) Motor mounts are different w small block and big block engines
Here's the 19701 K-Frame numbers:
10 #2962010 Crossmember (K-Frame) 225 Engine
12 #2962012 Crossmember (K-Frame) 318, 340 & 383 Engines
14 #2962014 Crossmember (K-Frame) 426 Hemi w/ Skid
52 #3583052 Crossmember (K-Frame) 318, 340, 340 T/A & AAR, & 383 Engines
70 #3583070 Crossmember (K-Frame) 198 & 225 Engines
74 #3583074 Crossmember (K-Frame) 318, 340, 383 & (440 w/ Skid) Engines
76 #3583076 Crossmember (K-Frame) 426 Hemi w/ Skid
77 #3466477 Crossmember (K-Frame) 318, 383 & 440 (440 w/ Skid) Engines
My engine was a 318 Can I use it for a 440?
Essentially all V8 engines will bolt to the same K frame except the Hemi , as mentioned there were skid plates added to some for oil pan protection , this skid plate can be added to any K frame
As Chryco cited; You don't need any special type of "conversion" mounts, the V-8 K-member will accept any V-8 using the correct stock mounts and brackets for the particular engine.
The main difference between the 318 K-member and the 440 K-member is the 440 usually had a skid plate to protect the bottom of the pan...the skid plates are available for welding onto the 318 K-member. If you are using the factory 7 qt oil pan, add the skid plate.
Thanks for the info May more questions to ask in the future
Years ago I changed out my tired 318 for a better 440 . It fit perfect even the trans mount was the same . However I did have to shorten the driveshaft 3” I think .
Agree with that. The K-member in my 73 cuda accepted a 440 with no issues.