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Cracked 351 Cleveland Heads
#1
Hi everyone,

I have a 1972 Ford Mustang with a 351 Cleveland 2 valve engine. I recently discovered that both of the heads have a hairline crack in them that need to get welded. I have also been told to look into aluminum heads instead because the cast irons are notorious for cracks. I plan to put an Edlebrock 650cfm 4 barrel carburetor and performer intake manifold on my engine when I put it back together. Do you guys recommend going with the aluminum’s because they will be more reliable in the future? Is this going to be to much power for the stock engine block, pistons, crankshaft and transmission (mine is an FMX automatic transmission)? Taking apart my engine has been unknown territory for me and i’m learning along the way. The last thing i want is to make a fatal mistake. So I’d appreciate all the help I can get please! 




[Image: DB092_A97_BAA8_4_CB2_97_BB_186607_A220_BB.jpg]

[Image: 414_AFB9_E_2_AB0_446_F_BC00_F85_DBD73_FC40.jpg]
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#2
Being only 2V heads I would replace them. If your not doing a complete rebuild get some edlebrocks to match your combustin chamber. It would not be that hard to find some other cast iron 2 V heads and rebuild them.
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#3
BTW 2v means two barrel carb, not two valves. The V stands for venturi.

run_horse Run Horse Run!
John 72 Q Code
[+] 1 user Likes jpaz's post
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#4
bigfoot72,

What is your budget allow for? Aluminum is not cheap!

Aussie Ford 351 Cleveland cylinder heads 2V Closed Chamber 351C Australian Aus

https://www.ebay.com/itm/Aussie-Ford-351...3194526472

Thanks,
mustang7173 Thankyouyellow

"Courage is being scared to death but saddling up anyway" -- John Wayne
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#5
Its hard to see on the pict if its a crack caused by stress. Loads of 351c cast heads/blocks are having these and handle the power without probs.
Cast made in Mexico were notorious for getting the palm of best scary looking cracks.

May be you could let them inspected by specialists. Considering the cost of new heads, might be worth it.

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
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#6
(05-10-2018, 03:37 PM)mustang7173 Wrote: bigfoot72,

What is your budget allow for? Aluminum is not cheap!

Aussie Ford 351 Cleveland cylinder heads 2V Closed Chamber 351C Australian Aus

https://www.ebay.com/itm/Aussie-Ford-351...3194526472

About $2k. What is the benefit of Australian heads?
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#7
(05-10-2018, 05:46 PM)bigfoot72 Wrote:
(05-10-2018, 03:37 PM)mustang7173 Wrote: bigfoot72,

What is your budget allow for? Aluminum is not cheap!

Aussie Ford 351 Cleveland cylinder heads 2V Closed Chamber 351C Australian Aus

https://www.ebay.com/itm/Aussie-Ford-351...3194526472

About $2k. What is the benefit of Australian heads?


Hello Bigfoot,

You have the ports of the 2v heads and the quenched chambers of the 4V heads. It may be better to find a set of modern aluminum heads due to their better flow.

Thanks,
mustang7173 Thankyouyellow

"Courage is being scared to death but saddling up anyway" -- John Wayne
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#8
If you're not looking for big horsepower your original heads are fine but will depend on cost to rebuild yours vs a set of Edelbrock alloy heads
At a minimum you would want to replace the valves with one piece collet type and if going with a better camshaft new valve springs
By the time you get your original heads totally rebuilt and welded it might be a better proposition to get alloys.
The Aussie 351 2V CC heads are actually only used on our 302C not the 351. I ended up getting my 302 2V heads rebuilt with extensive CNC porting and other mods which ended up costing more than originally thought so perhaps the CHI 3V would have been a better choice but too late now
Probably best to get a quote to rebuild and weld your heads first then weigh up the options
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#9
There is no reason in the world to put money into welding factory iron 2V heads. If the budget doesn't allow for aluminum now, find a pair of good used 2V heads. They are a dime a dozen. If you were closer I would give you the pair I have because I literally can't give them away.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#10
I have a pair I can't give away either LOL

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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