Correct Anti Surge Cap? [Archive] - Chevelle Tech

: Correct Anti Surge Cap?


MALIBRU
Sep 17th, 08, 12:38 AM
What I thought was the original (but rusty) gas cap on my '70 looks like this:
http://www.ecklers.com/images/vette/A2376.jpg
http://www.ecklers.com/product.asp?pf_id=A2376&dept_id=1498

Ground Up sends me:
http://www.ss396.com/mm5/graphics/00000009/XTC-149.jpg
http://www.ss396.com/mm5/merchant.mvc?Screen=PROD&Store_Code=chevellecamino&Product_Code=XTC-149&Category_Code=FUELTANKCAPS

Same looking unit as 3931449 at gmpartsdirect. The Paddock's version #3931449 words look debossed and it has the "S" rivet. While the top unit fits like a glove on my original tank, GU unit is quite tight to turn. Which of these is correct?