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440 67 915 heads on a 67 383, stock from factory?

If you go to a 1.74 exhaust valve you have to open the throats up otherwise its useless!

IMG_1788.JPG
 
Most 915 heads with 1.60 exhaust are cast with a "K" and 1.74 are cast with an "L". You just might have the 1.74 exhaust in them

275890-8d72b2c4250183a8df70c35f3416c538.jpg


275889-34ad137ee6930b95a84c60b9b64312fe.jpg
 
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