I'm collecting parts to build a 350-400 HP 355 for my k5 and was wondering if a header with a 1.5 primary tube can make that goal or if I need to get a header with 1 5/8 primary tube
well your going to need a lot more than headers to make that goal loll jk
Well I know that that. Headers are the only thing left that I'm not sure which way to go.
Both are a little small, 1 3/4 I would suggest
Quote from: marshall on September 15, 2012, 11:35:49 AM
Both are a little small, 1 3/4 I would suggest
what would you suggest?
I would go 1 5/8..... I envy you if headers is all you got left..... Im just starting on my 355 build guna be around 450-500hp range :)
Headers matter a lot. And on a naturally aspirated motor, to achieve max power you need to achieve maximum volumetric efficiency. You do need a nice flowing motor and I'm sure that 1 5/8 - 1 3/4 would be ok for a small block.
Talk to the proformance department at Chevrolet, they will tell you EXACTLY what it needs
Found this in my chevrolet performance manual. This is what you need for a balls out small block.
(http://i1074.photobucket.com/albums/w402/J_Thomas123/B84E16A2-9023-45EC-87E4-CD43B174D21A-93-00000009F0EEE8C9.jpg) (http://i1074.photobucket.com/albums/w402/J_Thomas123/B84E16A2-9023-45EC-87E4-CD43B174D21A-93-00000009F0EEE8C9.jpg)
Quote from: Jthomas on September 16, 2012, 03:11:46 AM
Headers matter a lot. And on a naturally aspirated motor, to achieve max power you need to achieve maximum volumetric efficiency. You do need a nice flowing motor and I'm sure that 1 5/8 - 1 3/4 would be ok for a small block.
Talk to the proformance department at Chevrolet, they will tell you EXACTLY what it needs
Found this in my chevrolet performance manual. This is what you need for a balls out small block.
(http://i1074.photobucket.com/albums/w402/J_Thomas123/B84E16A2-9023-45EC-87E4-CD43B174D21A-93-00000009F0EEE8C9.jpg) (http://i1074.photobucket.com/albums/w402/J_Thomas123/B84E16A2-9023-45EC-87E4-CD43B174D21A-93-00000009F0EEE8C9.jpg)
I believe this is refering to if you were to run open headers as on a race engine.... correct me if I am wrong
also we do need to know if you are running and exhaust or just gunna run open as it does make a difference
I'm not sure what they are calling a "tail pipe" but I'm assuming any exhaust after the header?
If not, well it gives you the length and size if ur going open header. This straight from CHEVEROLET PROFORMANCE.