head/manifold problem for fitment.
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head/manifold problem for fitment.
i'm getting back into the resto on my '77 shortbed and the engine has C8AE-H heads and came out of a Torino GT. The engine in the truck has one big problem, the driver side manifold exits right into the clutch linkage. well today i went to the junkyard and got a truck manifold off a 3/4ton with 360. Well seems like a great thing and I slide it in place then realize something. I'm missing some bolt holes and the top ones done even line up. the manifold I have is for the verticle bolt holes and the one off of it is a horizontal offset boltpattern on the exhaust manifold. it has all the top holes for the truck style manifold but only #5 and #8 cylinders have the lower hole and they dont even hardly line up. I dont know what to do right now, cant afford headers for it b/c in about a year and half its going diesel, i just need to have it drivable in the meantime and its either that of my buddy will trade me a nice running 390 truck motor and $200 to boot for my motor.
Hotshot
Joined: May 2003
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From: south louisiana
You've got the GT 390 heads. The two upper end bolt holes are about 1/4" lower than the other middle uppers.The two bottom holes never got drilled for that application, if you have the heads off, you can have the bottom holes drilled by a machine shop, but that still leaves the top end holes to deal with. You might be able to use 5/16" bolts & nuts there if you can waller the holes a little. Only manifolds that will fit those heads without mods are the GT 390 manifolds for Mustangs/Fairlanes/Comets and Torinos. Look on ebay, there's always a few sets there for sale. Sometimes they fetch more than the std box logs, sometimes less. Or buy a set of cheap pickup truck headers and drill the GT bolt pattern in them. I did just that 20 years ago swapping a GT390 into a 70 F100.
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only problem with the mustang/torino manifolds is they exit back towards/into the clutch linkage and i need the driver side to exit downward. i can get a set of heads off a 360, didnt get to look at the casting numbers though. but i can get them for next to nothing that way i could keep the hipo heads. heck they'd be fine if my truck was auto but the 4spd kills the plan.
Cargo Master
Joined: Feb 2004
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From: Central Texas
the driver side manifold exits right into the clutch linkage.
Hotshot
Joined: May 2003
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From: south louisiana
If the 360 had D2TE heads, those are identical to the C8AE-H head. There's nothing hi-po about the GT heads. Same heads, different bolt pattern for the exhaust. C8AE-H's come drilled either way. I've got a set of each, GT390 C8AE-H, std C8AE-H and a set of D2TE's. Don't get me wrong, they're still good heads, just that they're the most plentiful FE heads and aren't worth a fortune. Port em, put CJ sized valves in em, they'll work as good as CJ's, but give a tad more compression and bottom end power.
Lead Driver
Joined: Oct 2004
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From: Central Oregon
I have the 67 GT heads on my 66 F-100 4x4 and had same problem, I had a machine shop drill the bottom holes and I drilled the top, so the top mounting places have 2 holes that are drilled and taped. And then the stock manifolds will work, I used them until I got the headers put on.
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I got a set of C7AE-As from a 360 at my buddies junkyard this morning so i can call that problem solved, might help on octane usage too. looks like the heads were rebuilt not too long ago, my only concern is the valve springs being stout enough for the .533" lift cam
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Hotshot
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From: south louisiana
If you've got a new cam leave the old springs on till after the cam break-in, then swap em for new ones.
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Welp I should be set now, i decided eh, why be cheap even if its being replaced soon, i pulled the heads all apart, elected 3 exh valves for replacement, ordered new springs and i'm in the port matching process. Thanks for the help and on those D2TE or whatever heads what the specs on them. I know where a set of them is too i can get for almost nothing but i couldnt find anything about them in my book
Hotshot
Joined: May 2003
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From: south louisiana
The D2's are exactly the same specs as the C8AE-H's Only difference was the D2's had induction hardened seats for unleaded gas. Same ports, same valves, same everything just a different casting number.