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Old 06-11-2007, 21:48   #1 (permalink)
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Engine I.D. problems..... 390 or 428!?

ok so, my car is a 66 t-bird and the block has (c7me-a) on it, the intake has (C6ae 9425-G). The rebuilt engine has a plate welded to it saying the bore is .30 over mains .30 over and rods are .20 over (i think thats the order) The heads have D2TEAA with a 203 and 27 by the D2TEAA. I REALLY just want to know how to find if it is a 390 or a 428! I cant seem to find it anywhere. the block I.D. typed in google says its a 428... BUT ford supposedly used the same parts as the 428 on the 390. can anyone help me!? PLEASE!!!!! i have the whole top end off except the heads. Any easy ways to find it out?
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Old 06-12-2007, 16:36   #2 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

I'm afraid there is no easy way to tell a 390 from a 428 but there are a few things you can check and do. But first the C7ME-A casting number is generic and was used on many different bore FE and FT blocks. You know it's a rebuild and .030. The heads have been replaced and the D2 heads are 70's castings. But the exact same as the earlier C8-H's. The main difference is the D2's have induction hardened seats for unleaded gas. Back to the engine you can check the stroke and see if it's a 390 or 428. You can either measure with a lenght of wood dowel or remove the oilpan and look for a IU, IUB 428 crank identifier. But that still leaves the cyl bore mystery. To be sure you really need to measure them. Even with a measured 428 stroke you can have a 390 bore giving you a 410 plus the .030. A .030 428 bore will measure 4.16 and a .030 390 4.08. So you really need to measure the cyl bores and stroke to be certain what you have.

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Old 06-13-2007, 18:45   #3 (permalink)
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cool Re: Engine I.D. problems..... 390 or 428!?

If it has Z for the 5th digit of the VIN, it originally had a 390.
If it has Q for the 5th digit of the VIN, it originally had a 428.
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Old 06-19-2007, 17:10   #4 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

First off 428 didn't come out in 1966. It wasn't until the late 67 when they hit the street.

C7ME-A Blocks can be a car 428 or 390/360. Easy way to tell is to pull out a plug (#1 would be the easiest to do). Use a long rod and measure the stroke. If it is close to 4" then you got a 410 or a 428. If it is 3 3/4" then its a 390. If it is 3 1/2"...... Well it could be a 360
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Old 06-19-2007, 17:11   #5 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

And what Glenn said LOL
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Old 06-19-2007, 19:34   #6 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

I beg to differ..428's were introduced in 1966. I have a 428 PI block with a date code of 5L26 Dec. 26, 1965.
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Old 06-20-2007, 02:38   #7 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

5L26 is Nov not Dec. Ford skipped the letter "I" as it could be confused for a 1 on date codes. But your right 428 came out in 66 production cars.
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Old 06-20-2007, 06:49   #8 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

I'm Sorry. I was thinking about the 428 CJ's wasn't until late 67 when they came out with those! My bad.......
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Old 09-01-2007, 22:59   #9 (permalink)
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Re: Engine I.D. problems..... 390 or 428!?

Head gaskets are cheap. Pop a head off and measure the bore and stroke. The 428CJ came out April of 1968 (1968 1/2).
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