MY latest 390 little disaster - 460 Ford Forum
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post #1 of 8 (permalink) Old 01-09-2009, 10:10 PM Thread Starter
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MY latest 390 little disaster

motor started burning ALOT of oil and down on power
#4 cylinder low low compression.
Parked the truck, and now finally I've had a chance to pull it apart since I moved down to AZ


I do believe the block is ruined, it's .040 over already
I could sleeve it rebore and new pistons.
motor overall only has like 30K miles,

On the other hand I have a line on a 67 T-bird with a rebuild 390 I could get for $500. Use the motor, sell the rest. probably break even....

opinions?

thanks and take care!
D
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post #2 of 8 (permalink) Old 01-09-2009, 11:04 PM
RJP
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What are we looking at?....pic is kinda close to tell.
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post #3 of 8 (permalink) Old 01-09-2009, 11:07 PM Thread Starter
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#4 cylinder on my 69 pickup
The line on the cylinder wall is the wrist pin that rubbed through

D
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post #4 of 8 (permalink) Old 01-10-2009, 12:18 AM
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Quote:
Originally Posted by RJP
What are we looking at?....pic is kinda close to tell.
Looks like 2 big score marks in the cylinder wall. Might need to turn your brightness up on your monitor, sometimes I have a hard time seeing pics using different screens.
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post #5 of 8 (permalink) Old 01-10-2009, 01:46 AM
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What is done to it other than .040 over?

71 Torino 477
70 Mustang 482FE
75 F150 410FE
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post #6 of 8 (permalink) Old 01-10-2009, 07:48 AM
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I had the exact same problem happen on my 390. I took it all apart and sleeved the cylinder and when I put it back together I used spirol lox instead of the snap rings
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post #7 of 8 (permalink) Old 01-10-2009, 07:53 AM
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Had that happen on a 360 years ago. The wrist pin wore a groove in the cylinder wall so thin it was porous :shock: . Driving home from work one day all I saw was white smoke out the tailpipe. Motor never made a noise at all.

KenW
' 71 Ranchero GT , 466 , 4:11 Detroit Locker, Merkl Race Shop C6
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post #8 of 8 (permalink) Old 01-10-2009, 10:51 AM Thread Starter
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Yep The engine actually ran fine, smooth, no noises.. But oil smoke a plenty
I'm going to a call a couple machine shops today and see what sleeving will cost.
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