how to make a 360 to a 390
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- 1982 flareside
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how to make a 360 to a 390
My friend bought an 68' Mercury Cougar with a 289 auto. He is trading me the 289 with automatic with 120,000 miles on the engine. For an 360 with like 350,000 miles on the engine. He want to make it a 390 for more period correct engine. So how to make a 360 in to a 390.
Jeremy
1971 Ford F250 camper special 360 T18(old model) 4 speed 4.11 gears 2wd with 1969 doghouse soon to be daily driver FRANKENFORD
1982 Ford F150 flareside 300 T18(new model) 4 speed 4.11 gears 4wd Daily driver
Some people say my truck is ugly and all i say is "Beauty is in the eyes of the beholder.
1971 Ford F250 camper special 360 T18(old model) 4 speed 4.11 gears 2wd with 1969 doghouse soon to be daily driver FRANKENFORD
1982 Ford F150 flareside 300 T18(new model) 4 speed 4.11 gears 4wd Daily driver
Some people say my truck is ugly and all i say is "Beauty is in the eyes of the beholder.
- sideoilerfe
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Re: how to make a 360 to a 390
It's the same period. They are the same engine except the crank, rods and pistons. He needs a 390 rotating assembly.1982 flareside wrote:... For an 360 with like 350,000 miles on the engine. He want to make it a 390 for more period correct engine...
Side oiler FE, see if you can catch me!!!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
- 1982 flareside
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Re: how to make a 360 to a 390
Sorry for confusing you i mean for a cougar they came with 390s.
Jeremy
1971 Ford F250 camper special 360 T18(old model) 4 speed 4.11 gears 2wd with 1969 doghouse soon to be daily driver FRANKENFORD
1982 Ford F150 flareside 300 T18(new model) 4 speed 4.11 gears 4wd Daily driver
Some people say my truck is ugly and all i say is "Beauty is in the eyes of the beholder.
1971 Ford F250 camper special 360 T18(old model) 4 speed 4.11 gears 2wd with 1969 doghouse soon to be daily driver FRANKENFORD
1982 Ford F150 flareside 300 T18(new model) 4 speed 4.11 gears 4wd Daily driver
Some people say my truck is ugly and all i say is "Beauty is in the eyes of the beholder.
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Re: how to make a 360 to a 390
crank rods and pistons. plus bearigns and rings plus a whole gasket kit. redo the heads and get the cam you want.
- crewdcab
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Re: how to make a 360 to a 390
pistons are acutally the same, as the 360 and 390 have the same bore. He only needs crank(2U) and rods.
68 F-100 68 F-100 4x4 shortbed 69 F-100 shortbed
70 F-100 70 F-250 Crew 71 F-250 4x4
72 F-250 4x4 72 F-250 Camper Special Explorer
75 F-250 4x4 77 F-250 4x4 77 F-250 4x4 Crew
70 F-100 70 F-250 Crew 71 F-250 4x4
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- sideoilerfe
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Re: how to make a 360 to a 390
No, pistons are different. The 352/360 rods are longer so the 360 pistons have different pin height. The factory 360 pistons also had a full skirt.crewdcab wrote:pistons are acutally the same, as the 360 and 390 have the same bore. He only needs crank(2U) and rods.
Side oiler FE, see if you can catch me!!!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
- crewdcab
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Re: how to make a 360 to a 390
explain to me why 360 pistons will say 390 on the skirt then
68 F-100 68 F-100 4x4 shortbed 69 F-100 shortbed
70 F-100 70 F-250 Crew 71 F-250 4x4
72 F-250 4x4 72 F-250 Camper Special Explorer
75 F-250 4x4 77 F-250 4x4 77 F-250 4x4 Crew
70 F-100 70 F-250 Crew 71 F-250 4x4
72 F-250 4x4 72 F-250 Camper Special Explorer
75 F-250 4x4 77 F-250 4x4 77 F-250 4x4 Crew
- crewdcab
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Re: how to make a 360 to a 390
I just did some piston research from my interchange manual. I stand corrected. Pistons are different.
68 F-100 68 F-100 4x4 shortbed 69 F-100 shortbed
70 F-100 70 F-250 Crew 71 F-250 4x4
72 F-250 4x4 72 F-250 Camper Special Explorer
75 F-250 4x4 77 F-250 4x4 77 F-250 4x4 Crew
70 F-100 70 F-250 Crew 71 F-250 4x4
72 F-250 4x4 72 F-250 Camper Special Explorer
75 F-250 4x4 77 F-250 4x4 77 F-250 4x4 Crew
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Re: how to make a 360 to a 390
Ive heard on a engine post a coulple weeks ago that stock 360 (short skirt)pistons are the same as 390 car pistons,and the post went on to say that if you put 390 crank and rods in a 360 that you would have about 9.6 compression,with 72 cc heads. I dont know if this is true or not but i would like to know myself as im also making a 360 into a 390.
A 360 has 6.540"long rods and a 3.50 stroke, a 390 has 6.488" short rods and a 3.78 stroke,the 360 rods are .052 longer but the 390 has a .28" longer stroke,the difference being .228",I dont know what the pin hight differene is or if there is a differance but i know every time ive pulled the head off a 360 the piston dosent come to the top of the bore at TDC but a 390 will. i think im going to e-mail keith black and ask about the pin height. then we can answer this age old question of do you have to change pistons from a 360 to a 390
Opps it took me to long to post this 



- sideoilerfe
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Re: how to make a 360 to a 390

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Side oiler FE, see if you can catch me!!!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
1970 F250 4x4 390/4spd
1968 F250 4X2 360/C6/No Rust!
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Re: how to make a 360 to a 390
thank you for posting that,you should post that on 1971ford (ryan) engine post because someone has told him that 360 pistons will work in his 390 build. "building my 360/390 for towing" i belive is the tread.