351M/400 engine block cracking?

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willie
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Joined: 22 Nov 2019, 16:05

351M/400 engine block cracking?

#1

Post by willie » 02 Dec 2019, 22:25

I've been told this engine experiences engine block cracking pre 1977. Problem is in the water jacket above the lifter bores? Can anyone shed some light on this problem and can it be detected without tearing apart the engine ? My engine is in a 1976 Cougar XR7. Thanks to all who can help me out.

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70XR7Tom
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Location: Houston, TX

Re: 351M/400 engine block cracking?

#2

Post by 70XR7Tom » 03 Dec 2019, 17:05

You might try one of the 351 Cleveland sites, like Cleveland's Forever http://351c.net/board/index.php
Houston TX
CCOA # 9432 IMOA #7415 Southeast Texas Cats - Mercury Cougar Club
1970 Cougar XR7 Hardtop 351C-4V, FMX, PW, PB, PS, AC, Rear Window Defogger, Styled Steel Wheels,
White Vinyl Top, Special Paint - 1968 Madras Blue, Black Houndstooth interior- Bought April 2015
RIP - 1970 Cougar 351C-2V, FMX, PS, AC, Vinyl Top, retro fitted PB - New to 1983

willie
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Re: 351M/400 engine block cracking?

#3

Post by willie » 03 Dec 2019, 18:46

Thanks for the direction. :D

CATHOUSE
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Location: Elizabethtown PA

Re: 351M/400 engine block cracking?

#4

Post by CATHOUSE » 03 Dec 2019, 20:55

A 351M/400M is not the same as a 351C. I do not know if you will find much information on a 351M on a 351C site. You might try a Ford truck site as a lot of those Ms found their way into the late 1970 F series trucks.

Randy Goodling
CCOA #95

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70XR7Tom
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Location: Houston, TX

Re: 351M/400 engine block cracking?

#5

Post by 70XR7Tom » 03 Dec 2019, 22:00

George Reid's book "FORD 351 Cleveland Engine - How to Build for Max Performance" covers the 351C, and its evolution to the 400 and 351M. It does note that "Early Cleveland blocks seem to have been plagued with cracking issues in the lifter valley." For 351C he's recommending the D2AE-CA casting (1971). The "early" 351C's appear to be D0AE castings (1970 - 1971). The 400 and 351M are D1AE and later castings. I'm sure there is much more to the story than that, but that's all that is apparent from the book.
Houston TX
CCOA # 9432 IMOA #7415 Southeast Texas Cats - Mercury Cougar Club
1970 Cougar XR7 Hardtop 351C-4V, FMX, PW, PB, PS, AC, Rear Window Defogger, Styled Steel Wheels,
White Vinyl Top, Special Paint - 1968 Madras Blue, Black Houndstooth interior- Bought April 2015
RIP - 1970 Cougar 351C-2V, FMX, PS, AC, Vinyl Top, retro fitted PB - New to 1983

canted 393
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Location: New Hampton IA

Re: 351M/400 engine block cracking?

#6

Post by canted 393 » 03 Dec 2019, 22:51


Travis98146
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Re: 351M/400 engine block cracking?

#7

Post by Travis98146 » 12 Dec 2019, 17:38

I'd try to find some comparative numbers of the total reported cracked blocks vs total blocks built. If the percentage is fairly low, then you may be worrying needlessly.

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