40 or 55 series head?? December 28, 2011 12:26PM
picked up a 40 series 466 to replace my 404. should I spend the money to open up the 40 head or top it off with a stock 55 series? will the 55 stock equal the 40 after porting? where best to invest $$$ thanks
Reply Quote

Re: 40 or 55 series head?? December 28, 2011 01:48PM
I like the 55 heads better.
Reply Quote

Re: 40 or 55 series head?? December 28, 2011 02:04PM
cant get a 40 to flow what a stock 55 flows without getting into the water jackets. put a 55 on an be happy!
Reply Quote

Re: 40 or 55 series head?? December 28, 2011 02:54PM
What class are you going to run? I was wondering the same thing. How much better does a 55 series head flow compared to a 40 series?
Reply Quote

Re: 40 or 55 series head?? December 28, 2011 11:44PM
Curious as well but about price. How much we talking for a 55 series? Used or new
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 02:17AM
Go with the 55 series. There is such a big difference. Don't spend the money to try to make a 40 series work. 55 series aren't that bad in price for what you get.
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 03:04AM
Even if you have a 404, is the 55 series still better?
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 03:46AM
A stock 55 head flowes 210 to 215 cfm not sure what the 40 series flowes. Its well worth the money to go with the 55 head
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 04:13AM
I don't think a 55 series head will work on a 404. Due to the smaller bore, there is an interference problem between the valves and the top of the sleeve.
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 04:53AM
What is the best head to run with a 404 then?
Reply Quote

Re: 40 or 55 series head?? December 29, 2011 07:57AM
notch your sleeves for valve clearance and put on a 55 seris head, you will spend $2000 on bigger valves and springs, port and polish work and not get as much out of it as a stock 55 series head. if your going to spend $2000 anyhow I would spend it on a 55 series head, then when you move up you will have something to work with.
Reply Quote

Newer Topic Older Topic

Author:

Your Email:


Subject:
Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Message:
Website Statistics
Global: Topics: 38,777, Posts: 229,949, Members: 3,338.
This forum: Topics: 37,098, Posts: 226,034.

Our newest member Jacklovik2009