For all you guys running HP manifolds on their 340, wanted to know which of two filters to buy. The HP manifold and head pipe clearance is why I'm asking this question. Do not have head pipes to help me make the decision. May be a stupid question but here goes. 1968 340 application states Wix 51515. Application for 1970 states Wix 51068 which I believe is a tad shorter. HP manifolds were made for both years so why the change. If anyone can direct me in which direction I need to clock...
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