quote:Originally posted by PanteraDoug:
I'm talking about the bronze guide picture that George posted. If you look at the bronze guide the porter has tapered it.
Ok, I understand now, think the same as you.
They are very thin at the end, I will leave mine as they are I think
quote:]Originally posted by PanteraDoug:
With roller tipped rocker arms the lateral loading on the stems is reduced so I am not seeing oval shaped wear or splitting of the guides...so far..
Completely agree
quote:Originally posted by PanteraDoug:
I would follow the old Ford diagram of unshrouding the valves a little near the seats.
I have made one combustion chamber like you said, in fact my concern was shrouding at high lift and if it was needed to grind the squish area like wizard shows sometimes. (and or the heads ??!? look the next point)
quote:Originally posted by PanteraDoug:
If you want more, then you notch the top of the block like the 427 Ford blocks do.
Ok here come my question about block/gasket/head.
If you look to those 2 pictures,
I have scribed my head by using the block as a jig, so, what is scribed on the head is 1) the cylinder bore diameter and 2) the x2 valve notches.
A & C are the valve notches (on intake), they match almost perfectly between the block and the head.
B is a crevice volume which is only due to the gasket which is not matched with A & C contour. ==> why felpro has made that ? what was in the original engine ? this volume look very strange for me.
if we talk about unshrouding in some way we can grin the head and match it to the gasket (???) of course the block if it is not matched will look like a "step", but why this design ?
Also on the other side look at B', even more strange (!) this volume is created again but in the squich area and not next to a valve ? again why ? is that link to the quench a provide a "damping" volume when the piston reaches the top ?
For me this geometry is very surprising.