70 xl - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 19 (permalink) Old 06-13-2019, 05:41 PM
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Re: 70 xl

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Originally Posted by 70XL View Post
The Marti report will tell you what the car was born with based on the VIN number. The 429, which is the 385 series, or sometimes called the Lima engine, or Big Block Ford, was just one of the engine options available in these cars. I believe the engine options were a 240-l6, 302W -V8, 351W - V8, 390FE - V8, and 429 - V8. The 428 is a FE engine and would be straight swap for the 390 your VIN says the car was born with. At this point, in the absence of any real and reliable documentation, about the only way to know if your engine is what you were lead to believe it is would be to disassemble it and document the internal parts to find out if they are indeed for a 428 Police Interceptor engine.
He could measure the stroke using the "coat hanger/stiff wire/welding rod, in the spark plug hole" trick. (Google search will give you the method)

That would be an easy way to tell if it has the 390 stroke 3.78" or the 428 stroke 3.98".

Saves a tear down... just sayin'....
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post #17 of 19 (permalink) Old 06-13-2019, 07:30 PM
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Re: 70 xl

also p.i. engine has solid lifters. . valve cover removal is simple to at least determine it.s not just a z code 390
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post #18 of 19 (permalink) Old 06-14-2019, 06:38 AM Thread Starter
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Re: 70 xl

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Originally Posted by extech View Post
also p.i. engine has solid lifters. . valve cover removal is simple to at least determine it.s not just a z code 390
Wouldn't know what I'm looking for there. I know what the lifters are, but I wouldn't be able to tell whether they were solid or not.
Looks like I need to do the welding rod test.
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post #19 of 19 (permalink) Old 06-14-2019, 11:56 AM
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Re: 70 xl

To turn the crank you'll likely need a 15/16" socket and a cheater bar for your ratchet.

Putts drives a 1965 customized Galaxie. Rebuilt 390, 4100 electric choke on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.
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