Convert 360 to 390
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Convert 360 to 390
I was wondering what it would take to convert a 360 engine to a 390. From what i understand, they are almost the exact same engine except for the 390 has a crankshaft with a longer throw. So i am assuming that all i would have to do is swap out the crank and maybe install a deeper oil pan and possibly a different oil pump. Is this correct????? Any information would be helpful. Thanks.
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Everything on the heads has been rebuilt but they are still stock as well as the head gaskets.
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Post Fiend
Joined: Jan 2003
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From: Iowa
Do you have a casting number off the heads? It should be between the center two spark plugs. That will allow me to determine what the stock cc's are.
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Joined: Feb 2004
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From: Denton, Texas
Originally Posted by rusty70f100
Do you have a casting number off the heads? It should be between the center two spark plugs. That will allow me to determine what the stock cc's are.
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From: Denton, Texas
Originally Posted by rusty70f100
The different sizes are 67-70cc on the D2 and later heads, and 70-74cc on earlier heads. It does make a difference somewhat.
I ask because I just got my engine back from the shop. It's a 360 from a '71. I had it bored .030 over and 390 crank and rods installed.
I'm a little concerned because the shop put 360 pistons in it, thinking I would want the extra compression. It basically has zero deck clearance. Now I'm sure I'll have to run premium gas, and wondering if that will be enough.
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
Originally Posted by pollock
It will definitely make a difference in the ratio.
I ask because I just got my engine back from the shop. It's a 360 from a '71. I had it bored .030 over and 390 crank and rods installed.
I'm a little concerned because the shop put 360 pistons in it, thinking I would want the extra compression. It basically has zero deck clearance. Now I'm sure I'll have to run premium gas, and wondering if that will be enough.
I ask because I just got my engine back from the shop. It's a 360 from a '71. I had it bored .030 over and 390 crank and rods installed.
I'm a little concerned because the shop put 360 pistons in it, thinking I would want the extra compression. It basically has zero deck clearance. Now I'm sure I'll have to run premium gas, and wondering if that will be enough.
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From: Denton, Texas
Originally Posted by baddad457
With the right cam, it will run on even 87 octane with 10.25 to 1 compression, my 68 Merc's 390 does.