The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**kwmech** · 01-26-2019, 01:50 AM

When I put the cast iron back on I went with 2.5 from the pipes into a flowmaster Y pipe to 3'' single. Truck seems to have a lot more low end power...which is what a 454 is built for. Mileage is better also....I know that is relative with a big block. The headers in the long run were a real pain in the...

01-26-2019, 01:50 AM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,717	Re: K30 454 header recommendations When I put the cast iron back on I went with 2.5 from the pipes into a flowmaster Y pipe to 3'' single. Truck seems to have a lot more low end power...which is what a 454 is built for. Mileage is better also....I know that is relative with a big block. The headers in the long run were a real pain in the...