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head issues?

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FordMan1988
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head issues?

Post #1 by FordMan1988 » Wed Jan 20, 2010 1:17 pm

I been trying to gather information from anyone willing to give it to me, in my quest for finding a good engine (ALMOST had one) I was talking to an engine dealer here (largest in Lufkin TX) and I was told that the 300 had problems with the heads cracking. Has anyone had this problem?
1994 Ford F150 302 EFI 4R70W 3.55s
1985 Ford F150 300 T170 2.47s
1969 Ford F100 360 NP435 3.25s

mutt
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Re: head issues?

Post #2 by mutt » Wed Jan 20, 2010 1:26 pm

new to me. In normal service, with water in it?

FordMan1988
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Re: head issues?

Post #3 by FordMan1988 » Wed Jan 20, 2010 1:40 pm

mutt wrote:new to me. In normal service, with water in it?


Far as I know. I was told it was hard for him to find a good used engine that didnt have a cracked head. He said if it ever got the least bit warm it would crack. . . . . .
1994 Ford F150 302 EFI 4R70W 3.55s
1985 Ford F150 300 T170 2.47s
1969 Ford F100 360 NP435 3.25s

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StrangeRanger
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Re: head issues?

Post #4 by StrangeRanger » Wed Jan 20, 2010 1:54 pm

There is an issue with the late model EFI heads. AFAIK there was no problem with the earlier carb heads.
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

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tom954x4
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Re: head issues?

Post #5 by tom954x4 » Wed Jan 20, 2010 2:50 pm

SR, any further info re EFI heads? Cause? Relative frequency? Prevention? the statement "if it ever got the least warm it would crack" makes no sense to me. Catastrophic failure of cooling system at 4000 rpm = maybe, methinks.
1995 F-150 XL, 300-6, 4x4, ex-cab, sb, 3.08 5-speed, 2 1/2 in. exhaust w/flowmaster 50, MSDignition failed with no warning, now out, canopy, 179,000 + miles. Gone but not forgotten 1965 F-100 240 3spd lwb "the green hornet"; 1960 F-250 4x4, 223 six, 4sp with wrap-around rear window, two-tone paint, overhead camper.
Tow vehicle: 2012 F-250 4x4 6.7 diesel XLT s/c lwb

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StrangeRanger
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Re: head issues?

Post #6 by StrangeRanger » Wed Jan 20, 2010 3:22 pm

Sorry, I've got no details, only recall reading some comments about EFI heads cracking. I suspect it is not the near-universal issue that your machine shop describes
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)

Luckyman
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Re: head issues?

Post #7 by Luckyman » Wed Jan 20, 2010 3:44 pm

Never heard of a 300 head cracking in normal use or even in overheating situations wherein if you catch it overheating or even if it gets very very hot and you shut it off and let it cool down as soon as you know. One or two heads that may have cracked here or there doesnt make it a universal problem. Cracked heads is why I will never again, ever own a car/truck with aluminum heads. Never had a cracked cast iron head in 40+ years of auto ownership, and 34 years of 300 6 ownership. (knock on wood)

I suspect that the info from the guy in the shop is just as anecdotal as my info is.
1 "76" F150 RC, LB, 2WD, 300, NP435, 9" open 3.00, special order 2-76/Delivered 4-76. Still "new".

1 "73-79" F150 RC/SS/SB/4WD, "84"-300, T18, NP205, 9" open 3.50, Dana 44 3.50 open, Offy DP, Holley 470, EFI + single 2.5" exhaust. Gathered from 15+ donor/parts trucks. "Fubar". Runs good, safe, still needs details/project continues.

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Emerald 74 4X4
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Re: head issues?

Post #8 by Emerald 74 4X4 » Wed Jan 20, 2010 10:04 pm

Always take what people out there say with a grain of salt. One person had a bad experience, so that means everyone else they run into is warned that their bad experience is or could be yours too. Find the information yourself from a known good source (thats why you are here!); or a service manual, TSI, manufacturer, or personal/experimental experience (i.e. get one the "slightest bit warm" and see if it cracks). Or a professional! (thats why you are here!)
1974 Ford F-250, Turbocharged and Intercooled 300, Megasquirt Fuel Injection and Ignition control, EDIS, 7.8:1 compression, Harland Sharp roller rockers, Crane 284/272 cam, mild port/polish carb head - 194/1.60 valves, EFI manifolds into turbo - 3.5 inch to muffler - dual 3 inch out the back.

The Plankster Prankster
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Re: head issues?

Post #9 by The Plankster Prankster » Thu Jan 21, 2010 3:03 am

Luckyman wrote:Cracked heads is why I will never again, ever own a car/truck with aluminum heads. Never had a cracked cast iron head in 40+ years of auto ownership(knock on wood)

that doesn't stand as a universal claim. ever hear about ford's 4.0v6, iron heads, and they're darn near impossible to find good used ones.
on the other hand, there was that 87 dodge K-car i worked on, alum head, head gasket was blown, overheated and the works. head checked out straight with no cracks. runs fine to this day.

on a 300, my truck's fan is poor, so last winter i was fighting up snowy roads, ran till the top of the temp gage, threw snow on the radiator till it got back to mid-range, kept running it. carried on this way for about a month. runs fine to this day. 83 truck with a 79 motor, which is worn out to the point that you hear loud piston slap if your oil is less than 20w50. never had a head problem from it
83 F250 flatbed 300-6, NP435, 4X4, 5800lbs empty weight
87 E-350 6.9 diesel, c6, 3.55s, powertrax no-slip locker, onboard 120v power and compressed air, built out with toolboxes and toys

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THE FRENCHTOWN FLYER
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Re: head issues?

Post #10 by THE FRENCHTOWN FLYER » Thu Jan 21, 2010 8:10 am

I heard that they may crack if the engine is run out of coolant, whereas the carbed heads can withstand that kind of abuse. Something about excessive heat treat on the exhaust seats causing brittleness
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

FordMan1988
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Re: head issues?

Post #11 by FordMan1988 » Thu Jan 21, 2010 10:52 am

The Plankster Prankster wrote:
Luckyman wrote:Cracked heads is why I will never again, ever own a car/truck with aluminum heads. Never had a cracked cast iron head in 40+ years of auto ownership(knock on wood)

that doesn't stand as a universal claim. ever hear about ford's 4.0v6, iron heads, and they're darn near impossible to find good used ones.
on the other hand, there was that 87 dodge K-car i worked on, alum head, head gasket was blown, overheated and the works. head checked out straight with no cracks. runs fine to this day.

on a 300, my truck's fan is poor, so last winter i was fighting up snowy roads, ran till the top of the temp gage, threw snow on the radiator till it got back to mid-range, kept running it. carried on this way for about a month. runs fine to this day. 83 truck with a 79 motor, which is worn out to the point that you hear loud piston slap if your oil is less than 20w50. never had a head problem from it




What years are you reffering too? i have a 2007 4.0 six in the Mustang. anything I really need to know? (hopefully in about 2015 I will engine and trans swap to the new 5.0 4v. Ford Racing is supposed to offer swap kits later on)
1994 Ford F150 302 EFI 4R70W 3.55s
1985 Ford F150 300 T170 2.47s
1969 Ford F100 360 NP435 3.25s

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