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Author Topic:   Cracked 351C Heads?
timjk
Journeyman

Posts: 55
From:
Registered: Oct 2001

posted 12-20-2002 08:48 PM     Click Here to See the Profile for timjk   Click Here to Email timjk     Edit/Delete Message   Reply w/Quote
I have a set of 351C 4v heads with cracks
in the exhaust seat area. How repairable
is this problem? Doesn't look like new
seats will cover it all. Can they be welded?

Tim


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V8 Thumper
Gearhead

Posts: 3467
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 12-20-2002 08:54 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Depends on how far they go. Pin repairs can take care of not-too-bad cracks

------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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71RESTO
Gearhead

Posts: 1284
From: Oregon, USA
Registered: Oct 2000

posted 12-20-2002 09:17 PM     Click Here to See the Profile for 71RESTO   Click Here to Email 71RESTO     Edit/Delete Message   Reply w/Quote
Yes they can, but like others have said, it depends on how bad the crack is. On my '71 both heads had cracks when I had bought the car and had them repaired without any problems (5 years now).

------------------
Duane
71 Fastback (his) under resto (351C-4V C6 auto)
73 Mach 1 (hers) (351CJ 4 speed)
66 289/2V coupe (daughter Ashley's)
89 LX 2.3 convertible (daughter Amanda's)
M & M Member #730

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-20-2002 09:37 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
My closed chamber 4v heads have been weled. It was cracked from inside the intake bowl (about 1/2" below the seat), across the seat and into the exhaust bowl about 1/2" down.

You should have them checked and see if they can determine how deep the cracks are. Then you shoudl be able to determine if you want to spend the money getting them fixed.

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timjk
Journeyman

Posts: 55
From:
Registered: Oct 2001

posted 12-21-2002 03:51 PM     Click Here to See the Profile for timjk   Click Here to Email timjk     Edit/Delete Message   Reply w/Quote
Thanks for the encouraging replies!
These cracks are less than 1/2" total, running thru the exh. seats. I'll take 'em
to the head shop after all the Christmas
excitment is over. I plan to clean up the
ports a little before i have the valve job done. These heads are '72 open chambers.
What's the idea of the bump on the top of the exh. port. I plan to grind them off.

Tim

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-21-2002 03:59 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Grind that bump off, and while your in there, narrow and taper the guide boss too.

Depending on what you plan on doing with those heads, the exhuast ports can be made to flow pretty good. But it might sacrifice some bottom end. I dont really know about the bottom end problem, the convertor in my racecar flashes 6200 rpm so I'm a little beyond that when the car leaves.

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Dusty Kiser
Gearhead

Posts: 126
From: Bethel,Oh USA
Registered: Mar 2002

posted 12-26-2002 10:04 PM     Click Here to See the Profile for Dusty Kiser   Click Here to Email Dusty Kiser     Edit/Delete Message   Reply w/Quote
Indy Cylinder Heads can fix them. I ported some windsor heads till I hit water in exhaust port. I tried to weld them myself and couldn't get it leak free. Indy cut my duck droppings out, welded and reported, checked guide, cut seat, planed, and pressure tested for only $125! Best money I ever spent. I had many hours in those heads and thought they were junk.

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-26-2002 10:12 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
There's a shop in Nevada Iowa that can fix them too. They are as good (in my opinion) as Indy.

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