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Posting Guru
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From: Malvern, Ohio
Got a question here
Ok so I am measuring my FT heads for my 390 at least thats what i have been told thats what engine i have. The intake valve is 2.25. That seems kinda large to me. The head casting is D2TE AA. My guess is someone did a valve upgrade possibly, or do i just have somethin that isnt very common with these heavy duty Y blocks or what?
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From: Malvern, Ohio
The heads came with the block which is a D3TE block and 2 bbl intake which i dont have anymore. I measured the bore too and that is 4.065 - 4.078 took alot of measurements to see what i got the most. The valve size is definitely 2.25 on the intake, 1.56 or so on the exhuast.
I dont have the crank out yet but is there is certain amount of holes or a marking that says somethin about the stroke where the flywheel bolts up to?
I dont have the crank out yet but is there is certain amount of holes or a marking that says somethin about the stroke where the flywheel bolts up to?
FE "Freakin Expensive"
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From: Smith Mountain Lake, VA
Originally Posted by 385seriesHemi
The heads came with the block which is a D3TE block and 2 bbl intake which i dont have anymore. I measured the bore too and that is 4.065 - 4.078 took alot of measurements to see what i got the most. The valve size is definitely 2.25 on the intake, 1.56 or so on the exhuast.
I dont have the crank out yet but is there is certain amount of holes or a marking that says somethin about the stroke where the flywheel bolts up to?
I dont have the crank out yet but is there is certain amount of holes or a marking that says somethin about the stroke where the flywheel bolts up to?
The 1.55- 1.56" exhaust valve is stock size.....I really dont know..at 4:45 in the morning and no coffee yet this has me stumped..LOL.. I dont for the life of me understand why someone would put a 427 size Valve in a 390 head and leave the stock exhaust Valve in it? Because what goes in must come out..
I'am making a pot of coffee and scatching my head on this one!
RJ
Needsmorecoffee.
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From: CT
Short stroke cranks and early 390 cranks have the half moon shape and the square on the flange. Later 390 and 428's have the square notch. You can also look for the crank number on the edge of the counterweight. 2U, 3U, 2UA, IU, IUB etc...some early cranks even used a full casting number. I'm not sure what the cut off date was for the early 390's that got the half moon. The half moon was added to help hollowing out the rear crank throw with w drill bit. When Ford realized the half moon wasn't needed on the 390 it was no longer machined.
G.
G.
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From: Malvern, Ohio
Well measuring the bore i might of had the caliper cocked a litttle bit for gettin the 4.078 number sorry, but i do have the block still just not the intake manifold, the oil pan is still on it as of right now i think ill just take the thing apart 2day since im on xmas break from tech school.
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From: Malvern, Ohio
Alrighty, the crank says 2U, and what I noticed also is the connecting rods are C7TE-A. My guess is for the bore they might have had to hone the cylinders because it was "rebuilt" but i don't know about the connecting rods is the C7TE sound normal for that? kinda like the D3VE A2A heads are on the '79 460's.
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Post Fiend
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From: Iowa
FE casting numbers are kind of... odd. What's even odd(er) is that those rods do not belong with that crank.
The song that comes into my mind... One of these things is not like the other ones...
Those are long rods (think 352 or 360). That is a 390 crank from a '68 to '76 truck. All 390's, factory, used short rods.
FWIW, long rods = 6.54", while short rods = 6.488".
I'm going to guess someone rebuilt that sucker, figured out the huge valves they put in dont clear the bore, and scrapped the whole idea.
The song that comes into my mind... One of these things is not like the other ones...
Those are long rods (think 352 or 360). That is a 390 crank from a '68 to '76 truck. All 390's, factory, used short rods.
FWIW, long rods = 6.54", while short rods = 6.488".
I'm going to guess someone rebuilt that sucker, figured out the huge valves they put in dont clear the bore, and scrapped the whole idea.
Post Fiend
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From: Iowa
Weird. Are there notches on the cylinder bores? Because those 2.25" intake valves are NOT supposed to clear the bore. Of course, I'm just going by what I've heard for years on this forum, and by what every book on the subject says. Maybe everything's wrong and it works? Sure would be nice if it did!
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From: Malvern, Ohio
Ok I went back in the garage, to measure again on the valves because it was bothering me, its 2.025 on the intake. Yesterday i was pretty beat to heck SO I MISSED A DECIMAL PLACE LOL. Well i feel like an idiot not remebering the little dial is for the thousandths and not the hundredths place, stupid stupid stupid.
Trial and brief stupidity ya kno how that goes
O well, but i still wouldnt have any idea why the guy put the C7TE-A rod in though. i think this is solved thanks ya'll for your input!
Trial and brief stupidity ya kno how that goes
O well, but i still wouldnt have any idea why the guy put the C7TE-A rod in though. i think this is solved thanks ya'll for your input!
Post Fiend
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From: Iowa
Ok, that makes 110% more sense! LOL 
Anyway I can think of 2 possible reasons he used long rods:
1. That's what he had laying around, or
2. It started out as a 390 truck motor, complete with .112" deck clearance. He used the longer rods to lower the deck clearance .052", giving a nice increase in the compression ratio.
Anyway I can think of 2 possible reasons he used long rods:
1. That's what he had laying around, or
2. It started out as a 390 truck motor, complete with .112" deck clearance. He used the longer rods to lower the deck clearance .052", giving a nice increase in the compression ratio.
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