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Discussion Starter · #1 ·
...looking at the spark plug angle? If so, what direction will they be pointed? Up or down? Front or back? Also, can you ID them if they have a 90 degree boot? Thanks.
 

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The GT 40 has the plugs located same as E7s.
To identify look at front of head and there will be 3 cast in lines on front. Also down by #1 plug will be " GT " cast in small letters.
 

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Discussion Starter · #4 ·
Can I see all that jazz while they are in the car with the valve covers on? Which way are the plugs angled? Thanks!
 

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GT-40 heads

The "casting number" is F1ZE, F3ZE, or F4ZE.

GT is cast near the #1/#8 spark plug boss.

||| is cast on both ends of each head, near the coolant passages.

GT-40P heads

The "casting number" is F77E.

GTP is cast near the #1/#8 spark plug boss.

|||| is cast on both ends of each head, near the coolant passages.
 

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OMG here we go again!!!! There are like 20 million threads in this forum like this one. LOOK LOOK. :rolleyes:
 
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