Thread: Porting Question.

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HI GROUP,MY QUESTION IS...IS IT WORTH THE TIME INVOLVED TO GASKET MATCH THE PORTS ON AN EDELBROCK RPM AIRGAP MANIFOLD WITH THE INTAKE PORTS ON A SET AFTERMARKET ALUMINUM HEADS? BOTH THE HEADS AND MANIFOLD ARE FACTORY,NEVER BEEN TOUCHED.WHEN I LINE UP A SET OF FELPRO 1205s,THERE IS A GOOD BIT OF ALUMINUM TO REMOVE,NOT ENOUGH THAT IT WOULD HURT EITHER.WOULD THE PERFORMANCE PICK UP ENOUGH TO WARRANT THIS JOB? IM ONLY GOING TO GRIND IN ABOUT A HALF INCH.ANY FURTHER WOULD PROBABLY BE A WASTE BECAUSE IM NOT GOING TO OUT PORT EDELBROCK OR THE HEAD MAKER.THANKS FOR ANY INPUT!!!

IMO I say hell yes, but others would disagree with the 3-7 horse power you will add.....

no it not worth any thing your much better if the intake is just a bit smaller then the intake port and a gastket match on the bench will not guaranty that it fits when pulled down with the bolts it takes abit of time to get the line up good somtimes the intake will need to be mill to get it right

^^^^What Pat Said^^^^


Smaller intake ports resist reversion.

Originally Posted by camaro_fever68

^^^^What Pat Said^^^^


Smaller intake ports resist reversion.

yep

I like to set the manifold on, then reach in and feel how it matches up. If the manifold is a bit smaller, like Pat sez, that's a good thing. Only if an edge is sticking out into the wind do you want to get out the Dremel. Doesn't happen very often, but worth checking. There's no advantage, and maybe even a loss, by having the port swell at the gasket and then choke back down.

Originally Posted by camaro_fever68

^^^^What Pat Said^^^^


Smaller intake ports resist reversion.

Is this pretty much with a street engine ,daily driver, or is it also with a race engine??

Originally Posted by R Pope

I like to set the manifold on, then reach in and feel how it matches up. If the manifold is a bit smaller, like Pat sez, that's a good thing. Only if an edge is sticking out into the wind do you want to get out the Dremel. Doesn't happen very often, but worth checking. There's no advantage, and maybe even a loss, by having the port swell at the gasket and then choke back down.

WOW can we see a pic of your hand. Thats some pretty long fingers to be able to feel down the ports to see how they match up.

Originally Posted by BigTruckDriver

WOW can we see a pic of your hand. Thats some pretty long fingers to be able to feel down the ports to see how they match up.

I didn't know you were in Huntsville, for some reason I thought you were up North some where, not 70 miles north.

Originally Posted by BigTruckDriver

Is this pretty much with a street engine ,daily driver, or is it also with a race engine??

That's with any engine. Of course, the bigger the cam the worst reversion will become an issue. An 1/8" lip on the bottom of the intake runner has the most anti-reversion benefit. It's also beneficial if the headers are about an 1/8" below the bottom of the exhaust port.

Before any one here starts to port out a set of stock Chevy heads . Make sure you have a lot of extra time ! I have 7 Hours on one SB head and it's around 80% done . The heads that I am porting are the 305ci #601 55-58cc . I always hear how good they are when full ported . And how much power they make on the round and round 355 Claimer engines . Well good thing I have more time then money . I would say don't buy these 305 heads thinking you will port them easy and make Lots of power . When I am done they will work good . And this set of heads has screw in studs guide plates and S/S valves . Also a set of Z-28 LT-1 springs with HD retainers and Locks . Them old Fuelly heads never needed this much grinding

The heads I did before these . Were a set of 1972 350 #993 heads . That time I had more time then money to . Well that set took 60 Hours to finish . But man you should have seen how that car ran and sounded . That engine was a Low C/R 350 in 1978 Z-28 with a 450 Lift cam a 2800 stall and a 3.42 Posi . Even had a ported iron non-EGR intake from a truck on that build . I did the curve kit on the HEI and had a set of headers . That car ran 13.80s right of the high way . But not long after that a rod bolt failed . On some things you don't want to cut corners ! Rod bolts being one of them things . Add photo 11.48 pm

Both Tango and Denny are good. I ported my 305 heads(first time I did it) and just spent 9hrs. doing it with a hand held grinder. Showed it to a mechanic friend of mine who does it for a living and he suggested I take it down a little more but otherwide he said not bad. He said with the cam I had in my 305, the engine would breathe a hell of alot better. If I really had taken my time, I could have done alot better job after looking at some porting jobs done by my friend. I picked up alot on the higher end after 5,00 rpm's.

porting is not that bad i just hate the iron in the eye here one for you tango and ported the heads to and smooth out so much more but no photos of all that i do most of my big blocks this way the screens were not epoxy in the photo

Them 305 heads need a lot of porting . The bowl area or also called pockets . And all them casting bumps Never again will I do a set of these 305 heads . But the 355 they are going on will make 400 HP when I am done with them And that will be COOL .