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Thu, 29 January 2015 18:53

quadracerx1

Messages: 207
Registered: April 2013
Location: Puyallup, Washington

Karma: 1

Senior Member

Hi...

Are the 403 and 455 headers the same? I got a set of 403 headers but my coach has the 455?

Thanks for the help...

Steve

75 26' GMC Glenbrook Puyallup, Washington

Thu, 29 January 2015 19:02

Otterwan

Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...

Karma: 0

Senior Member

1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."

Thu, 29 January 2015 20:35

bwevers

Messages: 597
Registered: October 2010
Location: San Jose

Karma: 5

Senior Member

Applied GMC has different headers for the 455 and 403.
I was told that the 403 has smaller exhaust ports.

Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose

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