Thanks for the info. Butler did a good job on the heads. Air flow over .550 is very modest as with most d-ports due to shrouding. Please post the exhaust numbers too. My car at 3500lbs+ trashed the spider gears on a good track running in the 11.0 range. If you use a Strange spool, it is a 4 series and you will need 4 series gears. I do not know of anything numerically smaller than 3.73 for a 4 series carrier. The 3.55's would be great for the nitrous though. My 28" tires and 3.73's turn the motor too hard through the quarter.
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1971 Base Firebird..505ci IA 2A Round port E-heads by Butler 348 cfm.. Comp street SR 266/ [email protected] Victor intake/Quick Fuel Q950. 1 7/8" Dougs headers..3" mandrel bent exhaust with Hooker Max Flow mufflers, T-350 well built with 10" 4000 stall nitrous Continental converter..3.73 posi . Caltracs and 10" slicks. Belt driven water pump, alternator, Pwr steering and brakes,Flex fan. 11:1compression, straight 93 octane pump fuel. 10.35 @ 129.88 with 1.45 60ft N/A at 3700lbs race weight.
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