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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-18-2010   #1 (permalink)
uddlose429cj is offline Rookie


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Question Please! I need help 429 cobra jet problems

Hello everyone me and my dad have a 1973 mustang mach 1 with a 429 cobra jet, its cammed with hooker long tube headers, high rise alum. intake and a holly 4 barrel double pumper carb,

problems
1. orignal starter worked for a while but it broke somehow and did nothing when i turned the key, so i bought a duralast one from autozone and went home and installed it worked for about 20 seconds then blew up, i exchanged it and it did it again. is it a wireing problem or what maybe to much compression?

2. i filled up the radiator with 2 to 3 gallons of water, the car never really ran but turned over alot will there be water in the block? i was an idiot and forgot to flush or add anit freez the block before winter and the other day water was sitting next to the driver side tire(no freez plugs are on the ground thats why i think i just ruined the radiator)

what do you guys think. im trying hard to get this done because i would love to take it to my last prom
thanks
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Unread 02-19-2010   #2 (permalink)
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As far as the wiring goes, since you've had problems, I'd replace your battery cables and ground cables just to make sure you're getting juice to the starter sometimes they can look okay but have lots of resistance under load. It would be even better to use thicker cables. A new solenoid would be a good idea too

You never said how high your compression ratio is, if it's much higher than stock, you may need a high performance geared starter. If so, I'd get it from a company like Summit or Jegs rather than your local parts store.

As far as the freezing water, when you pour water into your radiator, it's going in the engine block too, and after cranking it a bit it's probably most of the way full by now. Your engine may still be okay but you'll want to thaw out the engine in a garage or with a heater and blanket for a few hours. It is possible to crack your block but I doubt that happened. Do you see a hole in your radiator? Water may have just come out the top or popped a hose off.
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Unread 02-19-2010   #3 (permalink)
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i looked at it today the buttom hose has frozen water, so i took it off and put a screw driver up the water pump and no ice, the radiator has no ice or water in it etheir so im thinking the water came from there , the 429 cj has a stock bore but a higher compression hi torq starter wouldnt hurt
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Unread 02-19-2010   #4 (permalink)
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If you've never had the car up to operating temp the thermostat has never had a chance to open and let the water into the block, so yeah you probably F'd the rad up. Good news is you can buy an aluminum one now.
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Unread 02-19-2010   #5 (permalink)
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Even with the thermostat closed, water can get into the engine and those 3 gallons of water had to go somewhere. Maybe it all leaked out before it froze though.
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Unread 02-19-2010   #6 (permalink)
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very true that water could have leaked out before freezing never thought of it like that because why would it freeze (popping freeze plugs out) then thaw out, so the water will leak out the temperature has been the same in the barn

the thermostat is on the intake but the radiator resevor is on the radiator and you poor water into that and theres a hose that goes from there to the water pump which i checked and today that hose has frozen water in it
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Unread 02-19-2010   #7 (permalink)
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try to turn it over by hand. see if its locked up.
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Unread 02-20-2010   #8 (permalink)
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Pull the spark plugs, so it has no compression, then see if you can turn it over with a wrench or the starter, if you can't then it is locked up, if it had water in and froze, it could have cracked something and gotten into the cylinders and rusted the cylinder walls. Good Luck.
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Unread 02-23-2010   #9 (permalink)
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i dont think its locked up because the autozone starter turned the motor over for 10 to 15 seconds, then i tryed to start again and nothing
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me and my dads project 1973 mustang mach1 fastback with a 1971 429 cobra jet, hooker long tube headers with cherry bombs thats all, new high rise alum. intake, new 4 barrel holly carb 750, holly fuel pump that pumps out way to much gas, gear drive-loud, cammed, cragars. so loud it shakes stuff off the wall in the garage
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Unread 02-23-2010   #10 (permalink)
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Check the dipstick, what does the oil look like? Can you see the fill lines?
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Unread 02-23-2010   #11 (permalink)
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i put 5 quarts in it before we started cranking it in the fall of last year, i havnt check it since
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me and my dads project 1973 mustang mach1 fastback with a 1971 429 cobra jet, hooker long tube headers with cherry bombs thats all, new high rise alum. intake, new 4 barrel holly carb 750, holly fuel pump that pumps out way to much gas, gear drive-loud, cammed, cragars. so loud it shakes stuff off the wall in the garage
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Unread 02-23-2010   #12 (permalink)
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Water freezes from the outside in. It will not usually push out the soft plugs before cracking the block. If the water froze then you probably have at the very least some warped cylinders and more than likely cracks.
ALWAYS use 50/50 mix of water and antifreeze. It lubricates the water pump seals, doesn't freeze and prevents corrosion. You might have learned a very expensive lesson.
You might luck out and have no major problems but I really doubt it.
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Unread 02-23-2010   #13 (permalink)
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but i mean isnt that what the plugs are for, is to pop out first,preventing a cracked block
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me and my dads project 1973 mustang mach1 fastback with a 1971 429 cobra jet, hooker long tube headers with cherry bombs thats all, new high rise alum. intake, new 4 barrel holly carb 750, holly fuel pump that pumps out way to much gas, gear drive-loud, cammed, cragars. so loud it shakes stuff off the wall in the garage
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Unread 02-23-2010   #14 (permalink)
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Hi! They are casting plug. People call them freeze plug because they do pop out some time when an engine freeze, but not there to prevent engine from cracking if it freeze. The holes in the block are there to remove the sand after casting.
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Unread 02-23-2010   #15 (permalink)
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Im scared that i might have cracked the block is there any way that i could check for ice or somthing ? is there a drain plug or some sort, i got the barn up above 32 degrees so if anything in the block it could drain

Im thinking Its Cracked cause i poured about 2 gallons of water in there, that much water should have some in the block unless the water pump stoped it from going in maybe ? i wish i knew how long that water was on the ground but there was alot. How much water in the block do you guys think itd take to crack?
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me and my dads project 1973 mustang mach1 fastback with a 1971 429 cobra jet, hooker long tube headers with cherry bombs thats all, new high rise alum. intake, new 4 barrel holly carb 750, holly fuel pump that pumps out way to much gas, gear drive-loud, cammed, cragars. so loud it shakes stuff off the wall in the garage
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