1966 S-code 390 specs please!

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Aug 18, 2005 | 09:35 PM

optikal illushun

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From: Coal Region

1966 S-code 390 specs please!

Anyone have or know where i can locate specs for a 1966 S-code 390? its found in cars and makes 335hp/427lb-ft torque.

im looking for intake/exhaust valve sizes, possible stock head flow and cam specs.

thanx!

Aug 19, 2005 | 12:02 AM

fordeverpower

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From: iowa

Its my impression this is a gt model. The heads are fairly standard. I think the have the extra bolt holes on the exhaust but thats about it. The valve sizes should be 2.02/1.55. These heads should flow about what c8ae-h and d2te-a flow. Kurt, has a set of flow figures and the ones I use are below.

heres what i got for cam specs same as 428cj
270/290
.481/.490
46 overlap
seat
18 72
82 28

(-30) 22
28 (-24)

I am not a 100% sure the cam timing is right there.
There are many better cams today than old factory techno.

Heres what i use for head flow:
.100 63 46
.200 115 88
.300 168 120
.400 193 138
.500 202 143
.600 207 145

Aug 19, 2005 | 12:41 AM

optikal illushun

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From: Coal Region

thanx!!!...

Aug 19, 2005 | 01:12 AM

Bear 45/70

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From: Union, Washington

fordeverpower is correct (the cam specs are close enough) and the GT heads have the stagger exhaust bolt pattern. The engines also came with a 600CFM Holley with vacuum secondaries. The stock exhaust manifolds for these engines were not the standard log type and flowed a lot better.