Hey Dick L -couple questions

Anonymous-0

Well-known Member
First, your Allis muffler pipe. If I remember you tapped the B/C exhuat with 1 1/4" pipe, right? My B muffler hits the (bent) hood and I'd like to 'fix' this forever.

Second, your SBC valve conversion. Are the lengths right, and did you use both the Chevy intake and exhaust valves? My initial blush was to use the Checvy intake and swap the Allis intake to the exhaust.

Thanks!
 
Your correct on all points. The valve length and keeper grooves are the same. I have done the same switch on the valves. Grind the exhaust seats to take the original intake valves and use the Chevy valve for the intake. That lets you to grind the seats in the head without installing new seats. Some of the pictures I have posted are of making both the intake and exhaust valves larger. Not sure the larger valves on both gave me all that much extra over what you are talking about doing at normal RPM's. I am sure that my biggest gain from head work was from the removal of all the restrictions in the ports for normal RPM's.

When making those changes it is a good time to get down thru the seat before enlarging them and removing the material to improve the flow. I use a rough stone on a die grinder and then go back in with a smooth stone to get it smoother. I ream the ports that mate up with the manifold to get them even in size and then blue the manifold to the head and match the manifold hole size to the head. I do that to any head that I grind the valves on.
 
Kinda talking about valve head work. The biggest difference is in surfacing the head to remove over .100 to increase compression. (make the firing chamber smaller)
 
Thanks for the input.

The head I just put on my B was cut enough that the factory governer cross arm hit the bottom of the water port.

Got a spare head (replaced the original with one I picked up, fresh rebuild for $100, hard to beat) and a new to me valve seat grinding tool, so thought I'd experiment some. Thinking about building custom manifold to use downdraft carb, gotta see how to attach the ends. Another project to keep me un-bored.
 
No big deal in bending/adjusting the cross over arm to work properly. Cause and effect dontchyaknow.
 

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