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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: 86C20Scottsdale on March 14, 2015, 10:31:36 pm

Title: Motor Swap
Post by: 86C20Scottsdale on March 14, 2015, 10:31:36 pm

I have a 1986 Chevy Scottsdale c20. That currently has a 305 with 215k miles. I'm wanting to do a motor swap. I'm not sure what tranny I currently have. And don't know what motor I should drop in it. I haven't found any 305 in my local junk yards. This truck is my daily driver and I want decent gas mileage. Any ideas?

Title: Re: Motor Swap
Post by: Captkaos on March 15, 2015, 01:16:26 pm

Describe decent gas mileage...

Why not rebuild the current motor?

Title: Re: Motor Swap
Post by: Stewart G Griffin on March 16, 2015, 11:00:55 am

The 6.2 and LS engines can offer better mpg than the 305 but they are not simple "drop in" swaps.

Title: Re: Motor Swap
Post by: 86C20Scottsdale on March 16, 2015, 11:14:53 am

14mpg is decent to me. I was thinking a 307 if I could find one.

Title: Re: Motor Swap
Post by: Captkaos on March 16, 2015, 12:30:05 pm

a 307 is going to be difficult to find.  I would recommend rebuilding the 305.  It should be able to get 14mpg average on a 2wd.  What gearing and trans are in your 3/4T?