Hi all, brand new here. I searched the internet and did a quick search here but I am having troubles finding specs (combustion chamber size, intake/exhaust runner size, valve diameters) on the heads that came on the 360 4 barrel truck engine. If I missed it somewhere I apologize in advance.

I have a 1975 F250 "Highboy". I'm going back to gas with it and have a 390 from a Fairlane that I'm freshening up but it has the GT heads with the 14 bolt pattern so headers are a trick (I want to run aftermarket long tubes). I also have 2 barrel heads from an 390 Fairlane with the 8 bolt pattern and the original 4 barrel 360 heads that came with the truck when I bought it. I'm having trouble finding specs on the 360 heads and hoping someone here can help me. Thanks in advance.

 

 

I'm not sure on casting numbers, I can take a look next weekend. Thanks for the info!

 

First, WELCOME to FTE!

360's never came with 4bbl's from the factory. If it has a 4bbl on it, it was replaced at some point in it's life. Or, it's not a 360 at all and it's already a 390. Check that "360" engine out, especially the crankshaft casting numbers.

 

To extend on that, I don't know that it is ever proper/true to refer to the heads as 2 bbl vs 4 bbl, is it?

 

Not that I'm aware of, with the FE or FT engines. The 351M/400, maybe.. or the 302/251W maybe... but not the FE/FT...

 

True. Specs are almost the same accross the board. I think the majority of FE heads have 71-74CC chambers except the early 60s and the D2TE heads. I'd have to look at the book again

 

Krewat Thanks for the info! The sticker on the valve cover says 360 so I believe it was the original motor. I just assumed nobody would swap an iron boat anchor intake onto a 360 just to put a 4 barrel autolite on. Either way the motor is already out. I swapped it for an idi diesel some years back. The idi let loose a few months ago (rod snapped in the middle, not off the crank or wrist pin). Best answers I got were vapor lock (from cavitation) and metal fatigue. I'm going to take the truck to Wisconsin with me in May. I have another 7.3 I could throw in but I want to go back to gas because of the distance I'm taking it. I have a 390 that just needs a different cam to bring the power into a useable range for a truck. Aluminum intake, 4bbl edelbrock, 428 rods, forged pistons. Just trying to decide what heads to use.

On the heads, you say there is no difference between the heads that came on 4 bbl vs. 2 bbl FE engines? Is there a difference in years? For example the "2 bbl" heads I have are from a 66 or 67 fairlane and I have the heads on the 360 I pulled from the pickup. Assuming it's the engine it came with from the factory, is there a difference difference between the two sets of heads? Would one set breathe better? (I know this is kind of a non issue given the low rpm range for this application). I'm graduating and taking a full time engineering position in May and I plan on buying some aluminum heads fairly soon but until then I'm trying to decide which set to run.

 

 

I'll get the casting numbers from the heads this weekend. Thanks all!

 

On the first statement ? You'd be amazed at the number of guys even here bolted on those cast iron boat anchor 4 bbl intakes here on this forum. On the second: there were never different (specific) FE heads for 4 bbl vs 2 bbl engines. There were two basic chamber shapes in the late 60's FE's, horseshoe and oval, the oval being used in the C8AE-H and the later D2TE heads. You can use those 14 bolt heads with truck headers, I did this with a GT390 in a 70 F100 just by having the four middle bottom holes drilled and tapped.

 

If anything there were different PISTONS on 2bbl vs 4bbl car engines because the 4bbl engines usually had higher compression. But not the heads.

And take it from someone who put a 2bbl to 4bbl adapter on a 360... a larger carb did actually help it breathe more especially with headers...

 

Got the numbers . Numbers as well as specs I was able to find are as follows:

C6AE-U
2.02/1.55 valves
68 cc comb. chamber

​​​​​​C7AE-A
2.02/1.55 valves
68 cc comb. chamber

D2TTAA
2.02/1.55 valves
72 cc comb. chamber

These were pulled off the internet so please let me know if I am incorrect. Given this information I plan on using the C6 or C7 heads. If theres something I'm missing please let me know.

 

Got the numbers . Numbers as well as specs I was able to find are as follows:

C6AE-U
2.02/1.55 valves
68 cc comb. chamber

​​​​​​C7AE-A
2.02/1.55 valves
68 cc comb. chamber

D2TTAA
2.02/1.55 valves
72 cc comb. chamber

These were pulled off the internet so please let me know if I am incorrect. Given this information I plan on using the C6 or C7 heads. If theres something I'm missing please let me know.

 

No such thing as a 360 w/a 4V carb, all came with 2V's (VIN engine code Y). And the only V8 installed in 1968/76 F100/250 4WD's was the 360.

But, the 360 heads are the same as 390 heads installed in trucks. The D2TE heads were introduced in 1972 and have hardened valve seats. No car had an FE engine after 1971.

F100/350: 1968/73 390's came with 2V's as did some 1974/76's (VIN engine code H). 390 with a 4V was optional 1974/76 (VIN engine code M).