318 head porting for the average joe
pardon me for being a complete noob, but can you please explain exactly what you mean by this? Do you mean 1/2 and inch from where the guide begins? If so, what effect might that have on the life of the guide insert?
And where are the updates? I've been hanging out for me DIY tips. (My dremel and carbide burr kit should be here by the weekend)
Noob's dont ask questions like this, so im not buying that excuse. Its obvious u have already formed an opinion on that based on this or that that u've heard or encountered.
'The tail length of the guide...not height', though that will come next...and no you dont need to chop it a 1/2 inch, more like 3/8-TOPS.
Most people will wipe out guides from extreme lift cams without the use of roller rockers before a half inch out of the guides height will, and thats fact.
Not only that...but at the point where u'd think it might...these heads would be way out of app/the worst choice unless rule mandated to be running at that .600+ lift.lol
fwiw An old MP book a friend has even says to cut the entire guide boss out completely, I dont believe that will be needed to get the numbers in this case.
Btw,lol.... How much more are you expecting here?
you have step pics on how to do the bowl/guide/short turn...as well as the simple mods to the exhaust port....and really for this thread, all I have left is to work the entire length of the straight wall from window to bowl, basically widening the port more to squeeze another 10cfm.
If you want bigger numbers than 210cfm from a port that org went 175...then get a bigger valve, it will be easier..trust me.
This is not the only thing i have going ;)
as for now this head flows 196/179 .600 peak and 181/
[email protected] & 190/
[email protected] about an 84% exhaust flow ratio and with that high side ratio, these heads would be beneficial wether it be with the use of headers or especially the use of exhaust manifolds...which kinda falls in line with idea of this thread=low buck average guy stuff.:evil3:
I will get new port volume numbers up soon and do a lil more int work like mentioned above.