The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Calling 454HO, Vortec BBC install help needed!

thepenguin99 · 11-19-2010, 02:38 AM

Thank you! Those pics are very helpful. I got under my truck and measured my vortec 454 cups vs the 305 cups and sure enough they were a good 3/8" shorter. That is probably at least part of the reason my headers are giving me hell. Unfortunately, I don't have parts from an older BB so I am going to try to use the 305 clamshells and cups on the 454.

11-19-2010, 02:38 AM	#4
thepenguin99 Registered User Join Date: Mar 2004 Location: Millington TN Posts: 435	Re: Calling 454HO, Vortec BBC install help needed! Thank you! Those pics are very helpful. I got under my truck and measured my vortec 454 cups vs the 305 cups and sure enough they were a good 3/8" shorter. That is probably at least part of the reason my headers are giving me hell. Unfortunately, I don't have parts from an older BB so I am going to try to use the 305 clamshells and cups on the 454.