Thread: 383 for towing a travel trailer

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How much HP and torque drop will 1 1/2" long tube headers have.....at 3500 RPM?

"Dropping down to 1 5/8" on the header tube size drops 5 hp and 3 ft/lbs of torque, so if it's easier to fit the smaller tubes, I'd do it. DO NOT GO ANY SMALLER THAN 1 5/8".

Originally Posted by jbright300

How much HP and torque drop will 1 1/2" long tube headers have.....at 3500 RPM?

"Dropping down to 1 5/8" on the header tube size drops 5 hp and 3 ft/lbs of torque, so if it's easier to fit the smaller tubes, I'd do it. DO NOT GO ANY SMALLER THAN 1 5/8".

1 3/4" headers 463 ft/lbs @3500
1 1/2" headers 433 ft/lbs @3500

You choose.