Port matching Edelbrock Exhausts

I'll try to post some pics from my phone after starting this thread,
 but how much has everyone been opening up the exhaust ports on their Edelbrock heads to match their headers?
The factory literature says the exhaust port is "CNC-profiled to match Fel-Pro #1434 exhaust gaskets",
 but it really is pretty small compared to the header gaskets I have here,
 especially the roof of the port, and also the dog leg.


I understand the value of leaving a bit of a lip from the exhaust port to the header (helps with anti-reversion),
 but going from the Eddy heads to Doug's d103's (1.75") is much more than a small step up in size.

Just knocking down the edges would probably not change much,
 and I don't know how far I can, or should change the roof line just to port match.

Any input on this would be appreciated
Thanks!

Edited by jpnjim - Mar/29/2018 at 10:53am

jcisworthy wrote: You should be able to match to that gasket without any problems.  The heads I got were much higher at the bottom compared to the header gaskets I have and if I were to match it there would have been about .080" on the bottom for gasket sealing.  I left the bottom and matched from sidways and up.  With a valve job and porting the ports went low 190's without a pipe. Out of the box the exhausts flowed in the 160 range I think.

Thanks John!

 I was hoping you'd chime in

I'm a little surprised how much more centered/higher your ports were to start,
though I guess it could just be the bolt locations that shifted a bit at some point.

I don't need to get too crazy with this build,
 but why bother using long tube headers and aluminum heads, if I'm going to leave power on the table leaving the small exhaust ports as is.

I just wanted to be sure there was enough material up top to opening it up.

I say go for it