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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

390 engine help

Old May 18, 2025 | 04:13 PM
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jays 72 f250
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390 engine help

Good afternoon friends I am a youngster in need of advice,
I am currently in the process of rebuilding my 390 with a pretty mild build motors bored 30 out and got a mtf-4cam and corresponding springs
now the question is since I am also converting to efi

will the efi be okay for the initial engine breakin ?
 
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Old May 18, 2025 | 04:59 PM
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From: SW GA
Originally Posted by jays 72 f250
Good afternoon friends I am a youngster in need of advice,
I am currently in the process of rebuilding my 390 with a pretty mild build motors bored 30 out and got a mtf-4cam and corresponding springs
now the question is since I am also converting to efi

will the efi be okay for the initial engine breakin ?
are you using a previously tuned setup? If not I would not plan on it as the breaking of tappets requires varying the speed around 2k rpm and the edi may be trying to learn right out of the box. I've not done it but that's my $.02
 
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Old May 18, 2025 | 05:05 PM
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That’s what my concern was because I’ve never used this efi set up and this is my first engine rebuild
 
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Old May 18, 2025 | 06:55 PM
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IMO based on lots of tear filled posts here, pay the money and get a quality roller cam setup.

 
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