Big-Block Chevy Build - Dyno Test Results

The Gen VI block incorporates a taller lifter body, so we used Crane's taller solid-lifter body (right), which allowed Tim to reuse the stock factory lifter tie bars and spider arrangement.
The Gen VI block incorporates a taller lifter body, so we used Crane's taller solid-lifter
Ed Taylor bolted our rotund Rodent on the dyno at Duttweiler Performance using an Edelbrock Victor Jr. 4500-style single plane along with a Demon 1,090-cfm Race Demon carb.
Ed Taylor bolted our rotund Rodent on the dyno at Duttweiler Performance using an Edelbroc
Tim and Ed discovered that even with the biggest jets in the Demon carb, the 540ci Rat wanted a bunch more fuel to maximize peak power. That's an Edelbrock Victor Jr. 454R intake for the 4500-style Demon.
Tim and Ed discovered that even with the biggest jets in the Demon carb, the 540ci Rat wan

The solution for feeding this thirsty Rat was increasing the size of the power-valve channel restrictor (arrow 1) and eventually increasing the intermediate circuit (arrow 2) to make the air/fuel ratio safer and to make best power.
The solution for feeding this thirsty Rat was increasing the size of the power-valve chann
To reinforce that this is no max-compression, race-gas-only motor, Ed performed a quickie compression test, revealing a mere 175 psi of cranking pressure.
To reinforce that this is no max-compression, race-gas-only motor, Ed performed a quickie

Test Numbers
Test 1: The 540ci Rat complete with 2-inch primary tube headers with an open exhaust system

Test 2: The same as Test 1 except the addition of a complete 3-inch exhaust system and Flowmaster mufflers