Reply to thread

Message: <blockquote data-quote="toyman" data-source="post: 997637" data-attributes="member: 10841"><p>Here's the poop. The KB comes with a 5" underdrive crank pulley for the standard intake. That will give about 5-6 psi with the OEM heads. The OEM crank pulley is 6.5" and the OEM Cobra is 5.85". So when I did the engine build with Edlebrock Performer heads the boost fell to 4 psi (better flowing heads). I changed the crank pulley to the 5.85" pulley and I now see 8 psi of boost. This is without changing the KB snout pulley which IIRC is 3 1/8" on the standard kit.</p></blockquote><p></p>