1 3/4" vs. 2" Header Size - ZR-1 Net Registry Forums

Top Toy · 03-06-2018

Just watched an Engine Masters video, https://www.youtube.com/results?sear...rs+header+test, (love these videos!) where they tested various primary tube size headers on a small block Chevy. They found that 1 7/8" headers vs. 1 3/4" made just slightly more power at the top end and lost some torque in the mid-range. Wondering if anyone has any dyno results of Watson (1 3/4") vs. Stainless Works (2") for our cars? Are OBX 2"? I'm guessing 2" helps the LT5 in the 6000-7000 rpm range but hurts down below.

03-06-2018	#1
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 308	1 3/4" vs. 2" Header Size Just watched an Engine Masters video, https://www.youtube.com/results?sear...rs+header+test, (love these videos!) where they tested various primary tube size headers on a small block Chevy. They found that 1 7/8" headers vs. 1 3/4" made just slightly more power at the top end and lost some torque in the mid-range. Wondering if anyone has any dyno results of Watson (1 3/4") vs. Stainless Works (2") for our cars? Are OBX 2"? I'm guessing 2" helps the LT5 in the 6000-7000 rpm range but hurts down below. __________________ '95 ZR-1, aqua/gray, #167 368 LPE/Haibeck, Web cams, Stainless Works headers, B&B Fusion exhaust, 18" Fikse wheels, Alcon brakes, lowered. 491 SAE RWHP.