Re: C7ae-a head porting
There isn't much to be gained at the plug bump, I would avoid it, where the heads can use so work is around the bottom of the valve guides, and then a slight opening of the throat when you have your valve job done. In fact, a good valve job and blend to the bowl, and some clean up of the guide bosses will get you significant gains with little risk
Be sure you "match" the roof and floor of the exhaust port to your headers, and realize, if you run early or CJ ports, you won't be able to get there. It doesn't have to match the exhaust perfectly, in fact, I like to leave a little step, in theory it may help reversion. If you are going to run stock manifolds, I wouldn't even worry about it, because they will steal more flow than you can gain.
You didn't ask about the intake, but, if running a medium riser intake (RPM, etc) gasket match the intake side to a 1247 or Mr Gasket 202A, if running a low riser intake, match the roof and sides to a low riser gasket and roll back the floor lightly just so it isn't a sharp edge, don't gasket match the bottom, all the flow should stay on top of the port
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.
Last edited by My427stang; 05-27-2019 at 10:04 AM.