4age with 272 cams and carbs
Posted: Sun Oct 01, 2017 12:03 pm
So this whole summer I've been running my 4age (3 rib block bored 1mm over and a stock small port head) without issues. It also has weber 40 dcoe carbs. So the other day I though I would pep it up. Put some 272 cams with 8.1 lift. Now it still idles fine but when it gets the 3000 rpm its stumbles like crazy but once it passes it it has power again and before 3000 its fine as well. So I changed my main jets from 115 to 125 and my idle jets from 45 to 50 and every ignition timing I could try before getting upset haha any idea? Is it just my carbs not transitioning right or is it timing or both??