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#1
01-15-2026, 06:13 PM
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Doug's Measurement Needed
Going to try posting this here:
Anyone with round port Doug's headers on a 64-67 GTO that can tell me what the center to center is on the collectors? I have D port Doug's and I may be switching to round port heads. Wondering if it will line up to my X pipe. I know the collectors are 3.5" from the 3", no worries there. Thanks
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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#2
01-16-2026, 01:50 AM
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I measure 21” center to center on my Doug’s round ports.
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#3
01-16-2026, 07:18 PM
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Excellent! Thank you!
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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