jayb's adapter port matching

[gregaba]

A quick question for jayb.
I did a search and came up with nothing so I will ask about port matching your adapter.
My block has been in the machine shop for 2 months now so I though I would get the adapter ready but have a few questions.
I have the gaskets you used for your adp. design.
Do I just put the gasket on the adp. and grind the ports to the gasket size?
Thanks
Greg

[Joe-JDC]

Not Jay, but have done several of his intakes and adapters to heads.  What heads?  What adapter, what intake?

The gasket you plan to use on the heads between the adapter and head needs to be placed on the adapter as if it were fitting on the head.  In other words, adapter side of gasket to adapter.  center the bolt holes, and scribe the ports.  On the adapter where the intake fits, lay the gasket like it was going to be installed, and center the bolt holes and scribe.  Same drill on intake manifold.  On the adapter, you need to watch about breaking into the pushrod tube areas on the end runners especially.  IT IS NOT NECESSARY to open up the ports to the gasket size to be able to flow much more than the heads will flow, even CNC'd heads.  Small is your friend.  Those adapters will flow over 400 cfm as shipped, and flaring them out the wrong way will actually decrease the flow.   Joe-JDC

[jayb]

Joe is correct, match the ports in the adapter to the head and the intake, not to the gasket.  It's easy to do because the ports in the adapter are only 2-1/2" or so long.  What I do is bolt the intake to the adapter with the gasket in place, then flip it over and port match the adapter to the intake by just reaching through from the head side.  Its easy to do.

On the head side, I like to coat the flange of the adapter with some machinist's blue dye, then bolt it onto the heads with gaskets while centering the distributor hole.  After you have it lined up right, you can take a welding rod or other piece of stiff wire, bend it to near a 180 degree angle and put a point on the end.  Then just reach in through the ports of the adapter and scribe the adapter's flange to match the port.  Take the adapter back off, port out to the lines you made, and you are done.

[gregaba]

Thanks for the answers. I am printing this out so I don't forget anything.
I have all ways gasket matched my heads in the past.
I am useing the Trick Flow intake which is a 2 bbl intake according to what I read but there is very little to cut if I just match the intake to the adapter.
This is a street motor so I don't need maximum flow but want the best I can get.
Since the adapter will flow good then I will just match my intake and heads to the adapter.
Thanks a lot for the help.
Greg