1966 S-code 390 specs please!
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Postmaster
Joined: Mar 2002
Posts: 3,545
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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!
im looking for intake/exhaust valve sizes, possible stock head flow and cam specs.
thanx!
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
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
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
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
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.
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