I snoozed and lost. Doesn't matter since this was a low deck block anyways.
Help spec'ing out a new small block
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Bobzilla
Well-Known Member
Are you saying you "had" to notch the bores for clearance? Or did you choose to notch the bores for unshrouding purposes?
Newbomb Turk mentioned moving the valve center on the larger valves in small block heads. That is something I understand but had not considered on the Victor heads. Does anyone know if the valve center on the intake, or the intake and exhaust, were moved on the Victor small head? I have not seen that mentioned anywhere yet but they do say the heads were intended to use a big block style rocker arm and a 16 degree valve angle, so who knows.
The engine that Valley performance built with Victor heads supposedly used a 4.10" bore, so we know they "fit" in that bore size.
They would have to be moved, half of a 2.15 + half a 1.6 = 1.875" and stock spacing is 1.87" that's leave less than zero room between valves.
Mine was basically by choice because it wasn't right. For unshrowding
dusterbing the peace
FABO pyrite member
The valves fit without issue…this is on my dead mock up block with 4.03. New one is 4.09, so there’ll be just a little more room (030 on the edge ain’t much though). Sorry, best pic I could get at the moment:
Whether or not you think you want to notch for shrouding is up to you, but Valley didn’t on their EM motor and it did pretty well.
Whether or not you think you want to notch for shrouding is up to you, but Valley didn’t on their EM motor and it did pretty well.
I thought the EM engine was a bigger bore.
dusterbing the peace
FABO pyrite member
Yes it was; 4.1. So, I guess you could say they put in a 50 thou notch? But if Bill is gonna build a new block, or even stay with the current one there’s going to be some over bore (full diameter notch work) anyhow.
Not sure how much (if any) Edelbrock moved the valves on these heads. The intake seat overlaps/is cut into the exhaust seat, so the valves dang near kiss each other.
I’m calling Edelbrock in the morning and find out if they moved the valves
dusterbing the peace
FABO pyrite member
Here’s a decent pic from the interwebs of the valves in the chamber…bend one and you’ll toast the other:
The offset on the intake rocker alone makes me rather certain there was some movement…no pushrod pinch though!
I'm guessing they had to move them out so they can clear the bigger valve. But out towards the wall thus the need for the big block rocker offset.
dusterbing the peace
FABO pyrite member
Here’s a shot I have from when I was checking geometry and setting up the rocker spacers:
that's basically similar to the w7's 1.936" spacing.
My R3 that I had my Indy heads on was 4.100 so I would be golden.
To add on this valve shrouding discussion my flowbench head adapter is a 4.010 cylinder sleeve. I could cheat the system a little and go 4.060
Or even 4.100 and the only one that would know would be me. I’m sure I could squeak a few more bragging numbers to my customers like many do on uncalibrated flowbenchs. I don’t buy into this shrouding as much as some guys because I see what my heads flow with a 2.08 valve or even my bigger valves in my Indy heads.
Or even 4.100 and the only one that would know would be me. I’m sure I could squeak a few more bragging numbers to my customers like many do on uncalibrated flowbenchs. I don’t buy into this shrouding as much as some guys because I see what my heads flow with a 2.08 valve or even my bigger valves in my Indy heads.
I agree. Don’t worry about valve shrouding. Avoid it if you can but it’s not the end all or huge power killer.
Newbomb Turk
Well-Known Member
They pretty much had to. You can get a 2.100 and 1.600 valve in there but your machine work has to be impeccable and even then you may see some witness marks of the margins just lovingly scraping each other.
mopar65
Well-Known Member
I would like to put that engine in my dakota.lol
Wait till Bill shows us the details of the engine he’s looking into having built.
You talk to someone? lol
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