Z Greek Posted August 15, 2011 Share Posted August 15, 2011 Hey motorheads. I am building a 3.1 for my 74 260. I am using a N42 block, a P79 head, and a pair of N36 intake manifolds with SU's. Cam will be Rebello's grind specifically for 3.1, and SU's. I will probably pose this question to Dave Rebello also, but I thought I'd see if anyone had any input. My question revolves around the "divots," in the intake ports where the intake manifold meets the head. Since I am running carbs, I have no need for these divots. Any opinions on whether these "divots," disrupt airflow to any appreciable extent? Question, is it worth the effort to weld these up grind that area smooth? Quote Link to comment Share on other sites More sharing options...
ozconnection Posted August 15, 2011 Share Posted August 15, 2011 (edited) Yeah, weld 'em up. They will disrupt airflow, acceptable if an injector is there, unacceptable if there isn't. Edited August 15, 2011 by ozconnection Quote Link to comment Share on other sites More sharing options...
Xnke Posted August 15, 2011 Share Posted August 15, 2011 The divots being there are not a big deal; the biggest problem I had with them when I was running carbed was intake gasket leaks. Quote Link to comment Share on other sites More sharing options...
Z Greek Posted August 16, 2011 Author Share Posted August 16, 2011 Well, I had one for, and one against, so I welded 'em up. Quote Link to comment Share on other sites More sharing options...
ozconnection Posted August 16, 2011 Share Posted August 16, 2011 The divots being there are not a big deal; the biggest problem I had with them when I was running carbed was intake gasket leaks. EFI gaskets don't seal well on carbed intake manifolds. Use a Carb (260Z twin carb) gasket. Quote Link to comment Share on other sites More sharing options...
Z Greek Posted August 16, 2011 Author Share Posted August 16, 2011 Thanks, I'll do that, sounds like good advice Andy K Quote Link to comment Share on other sites More sharing options...
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