Pontiac V8 engine
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===Studs and guideplates=== | ===Studs and guideplates=== | ||
| + | Heads having pressed in studs will usually have smaller valves than heads having screw in studs, although there are exceptions to this like the 4X-1H 455 head. Pressed stud heads have a tapped hole between the studs for attaching a guide plate on most heads. | ||
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| + | [[File:Pressed vs screw stud pont.jpg]] | ||
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====The bottleneck stud==== | ====The bottleneck stud==== | ||
[[File:Pont stk stud.jpg|thumb|500px|Stock type Pontiac bottleneck stud]]Pontiac heads like the 6X and practically all other production Pontiac heads likely to be used in a performance-orientated build originally had screw in ''bottleneck'' studs and steel guideplates. There are some exceptions to this, like the Ram Air IV and "Ram Air II" round port heads, which used a straight 7/16" stud with an adjuster nut/lock nut. | [[File:Pont stk stud.jpg|thumb|500px|Stock type Pontiac bottleneck stud]]Pontiac heads like the 6X and practically all other production Pontiac heads likely to be used in a performance-orientated build originally had screw in ''bottleneck'' studs and steel guideplates. There are some exceptions to this, like the Ram Air IV and "Ram Air II" round port heads, which used a straight 7/16" stud with an adjuster nut/lock nut. | ||
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