Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Thu Mar 28, 2024 10:27 pm

All times are UTC-07:00




Post new topic  Reply to topic  [ 35 posts ]  Go to page Previous 1 2 3
Author Message
PostPosted: Sun Nov 07, 2021 6:05 am 
Offline
Turbo EFI

Joined: Sat Feb 20, 2010 10:23 am
Posts: 1321
Location: N. Ga.
Car Model: 64 Valiant
Greg, that practice is actually very common in NASCAR and many high level Comp Eliminator and Pro Stock drag classes that start out with blank cylinder head castings and other classes that require production cylinder head castings like Super Stock. For a slant, the better solution is to shift the valve location by machining the bore for the guide in the cylinder head, and then making an oversized OD guide to insert in the head. If you make an eccentric valve guide to offset the valve, you risk compounding error when you install the guide by shifting it any number of infinite resting places, kinda like an eccentric cam bushing. Boring the guide hole in the head is going to be much simpler and consistent valve to valve than an eccentric bushing will be.

_________________
There's no such thing as too much cam....only not enough engine!
Image


Top
   
PostPosted: Sun Nov 07, 2021 7:25 am 
Offline
Turbo EFI

Joined: Sat Feb 20, 2010 10:23 am
Posts: 1321
Location: N. Ga.
Car Model: 64 Valiant
Charrlie_S wrote:
For a newly designed head the numbers you asked for are irrelevent, unless the valves are in the stock location. If you design the head, lets say for canted valves, the size could be different. My opinion, a "bolt on" head, would basically be just a stock head in aluminum, and a waist of time and money. If spending the effort, for a alloy head, it should be an improvement over the stock head, in terms of flow.

Correct Charrlie, it would largely be a waste of time. All inline forums(Chevy, Ford and Chrysler) have many threads over many years about this same topic. The main failure point is that not much thought is put into the making of the rest of the components to make it work, like intake manifold, exhaust manifold or header, valve cover, rocker arms and shafts, camshafts and a way to drive them if they are overhead style. The head is really only a small part of the bigger picture...

_________________
There's no such thing as too much cam....only not enough engine!

Image


Top
   
PostPosted: Thu Dec 02, 2021 6:37 am 
Offline
EFI Slant 6

Joined: Sat Mar 19, 2016 7:25 pm
Posts: 359
Location: SW PA
Car Model:
Moving the valves is done by milling the cast flush then offset boring the guide hole & then finish sizing for a common replacement guide. Usually .500" bore. The chance for finding porosity/water is always there, & goes up the more You offset. This will require FluidWeld or an epoxy to prevent seepage. I'm prepping to move some on a set of Olds heads soon.


Top
   
PostPosted: Thu Dec 02, 2021 6:57 am 
Offline
EFI Slant 6

Joined: Sat Mar 19, 2016 7:25 pm
Posts: 359
Location: SW PA
Car Model:
One of the perks of going to a smaller stem besides the usual benefits is it can buy You some room if don't mind turning the OD of a std. guide down.


Top
   
PostPosted: Fri Dec 03, 2021 6:51 am 
Offline
Turbo EFI

Joined: Sat Feb 20, 2010 10:23 am
Posts: 1321
Location: N. Ga.
Car Model: 64 Valiant
Killer6, pm sent....

_________________
There's no such thing as too much cam....only not enough engine!

Image


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 35 posts ]  Go to page Previous 1 2 3

All times are UTC-07:00


Who is online

Users browsing this forum: No registered users and 41 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited