about to start porting a set of e7's

[black94gt50]

Ok first of all I've looked and searched these forums for a guide on porting these heads, I know I've seen a write up on them with pics included but I cant seem to find the site again. I'm gonna go get these heads checked out monday or tuesday, if they are good with no cracks i'm gonna port them and really spend some time on them. I would like to get them cut for 1.85 intake valves and 1.54 exhaust valves, and have a nice 5 angle valve job done on them. I will be doing the porting and bowl blending myself though plus I have a nice set of Trick Flow valve springs and comp cams stud conversion kit, so i will have a pretty tough valvetrain. I think these heads would suit me pretty good, I've got a b303 cam and a trick flow street heat intake.I really dont want anybody to criticize me over this, I know you can make more power with aluminum heads and a set of trick flows or afrs have alot more potential, but i just dont have the money right now. I also would like to really see how fast i can get with the stock heads, I just think its pretty damn cool to have a fast stock headed car. I will appreciate it from all the work I've put into the heads and will be able to run with some of the bigger boys. If anyone knows of the site that has the guide to porting these heads could you please send me the link, I would greatly appreciate it.
thanks, clayton

 

[mytight95]

http://www.diyporting.com/ try copy and pasting that link... should be helpful



jason

 

[Zero Signal]

Are you sure the machinist isn't doing a 3-angle job? In either case it's a must.

What tools you you have for this? I strongly recommend a flexible-shaft grinder with a 1/4 collet handpiece and footpedal. If you are using a die grinder then you're good to go.

You can get the SA Delux Porting kit from Summit. You will want to get some extra tapered cartridge rolls. I ended up going through all mine too quickly since the large cartridge rolls hardly fit in the ports

Also, to speed it up alittle, you should probably pick up a carbide egg-shaped bit.

 

[black94gt50]

yes ive got the die grinder and ive looked at that set kit from summitt and will get it soon. thanks for the site mytight95

 

[mytight95]

i have a few old carbide burrs if you would want to have them sharpened, cheaper than buying new ones i could send them out..... new ones that i priced are around 30$ IIRC



jason

 

[final5-0]

Focus on the roof of the exhaust port. The exhaust is where E7's really suck.

You take the thermactor bump out or totally flush.

Then the idea is to make it more flat from port exit all the way to the port entrance from the bowl. The guide is totally flush when finished.

Other areas need work too like the bowl.

Lots of good articles are around. IIRC, Standard Abrasives was one.

Lots of light helps. Protect your eyes and wear a mask. A shop vac running when removing the first cuts is a good thing as well.

Carbide burrs are a must if you are gonna do more than a little port match thing.

This can be a lot of work here. If you go for a serious effort here and since this is your first time, you could have as much as 20 to 40 hours in time invested.

It is a lot of fun and you learn a lot

However

If you add up all the money your gonna spend in mandrels, burrs, cartridge rolls, die grinder, springs, valves, valve job, and other stuff needed, I'd bet you could find some gt40x Aluminum take off heads for close to the same.

Good Luck!

Grady

 

[mytight95]

I'm with grady, on the stuff costing so much..... However, if you do the porting(you can never factor in your own time into cost--you would be dissapointed) I would say you can spend no more than 200$ and get pretty good results, If you wanted the machine shop can cut the heads for new valves, while they have them.... THe machine shop that did the work to my heads finished blending the bowl area, valve guide area etc. put my new valves in, and surfaced the heads for about 225$.. You can pick up good power by if nothing else going to a larger exhaust valve. They have replacement sets of Ferrea, 1.90 1.60--- and 194 1.60, or even the gt-40 iron valve sets on e-bay for around 100$...... just a thought


I would honestly think about whether or not you want another set of heads down the road, as i had ported e7's, ran those a while, then upgraded to 1.94, 1.60 valves and better springs in those, etc... so i wound up spending more than half what i bought my alums for on the iron ones.... they did sell fast though. SO if you look at it that way...you can recoupe some of your money down the road


everyone is gonna look at it diffenrently, but i don't really regret the e7's i had....... nice power for what they were.


good luck



jason

 

[Zero Signal]

I say don't think so much about the economics, it will save you money but witth a few hundred more you could always do some else, but what's the fun in that? I with you on trying to hotrod the factory stuff, it's just fun to do. I enjoyed the whole process and learned a bunch. I'm even tempted to fix up my stock heads that are sitting in my backyard just for s&g's and give them to someone.


FYI - Just keep one thing in mind when lifting your exhuast roof; make sure you don't lift the exit higher than the inside of your header wall, you don't want a lip there unless you plan on special headers and/or doing some light porting on the header too. I got lucky and it turned out just right.

 

[final5-0]

Let me throw something else in here I just remembered

Most of you know I'm kinda over the hill

And that means I was around when all the different head choices were not available. Pro & Self Porting was the norm back then.

The talk about larger valves makes me want to point out some info here from those days.

Quite a few of the Pro's said the 1.90/1.60 valves were too big for maximun performance due to a shrouding effect. Some of them said by the time you laid the chamber back a bit for the unshrouding, the compression loss killed the gain of the larger valve.

Lots of the those guys said to go for the gt40 valve size (don't remember the exact size).

I have no way to confirm or deny but there is no doubt in my mind, this info came up over and over back in the day. Just passing on what I heard.

Having said that I'm no Pro Porter .....................

Maybe we can get lucky and Thumper or Tom Moss will give us more accurate info about all this stuff,

Grady

 

[8950HO]

http://hometown.aol.com/valakoraceheads/page11.html

Money well spent if you want to do it right.Tells you everything.

 

[black94gt50]

thanks for the other link 8950ho, also thanks for all the info grady you always seem to have every bit of info anyone ever needs. Mytight95 this is as far as im gonna go with this car, i drive it daily and i just want a little more power, which i think i can accomplish with a set of ported heads.

 

[mytight95]

thanks for the other link 8950ho, also thanks for all the info grady you always seem to have every bit of info anyone ever needs. Mytight95 this is as far as im gonna go with this car, i drive it daily and i just want a little more power, which i think i can accomplish with a set of ported heads.

Well then i would put a set of gt40 valves in it... 1.84 1.5? if i remember correctly, they come with at least a 3 angle on them.....for improved flow. And then port them out...i made about 250 with ported stockers, and a very lean a/f the one time i had it dynoed.....plus it had a nice curve... and tons of torque off idle



jason

 

[final5-0]

Well then i would put a set of gt40 valves in it... 1.84 1.5? if i remember correctly, they come with at least a 3 angle on them.....for improved flow. And then port them out...i made about 250 with ported stockers, and a very lean a/f the one time i had it dynoed.....plus it had a nice curve... and tons of torque off idle

jason

Since the info I gave was from a long time ago, one would sure wanna talk to peeps in the business of today to make sure that stuff still holds up today.

Lots of things have changed in that amount of time.

Seems to me, if one was gonna go to that much trouble

They outta Home Port a set of GT40's or GT40p's

Already got the bigger valves in em

Grady

 

[black94gt50]

yeah I believe im gonna go with the gt-40 valves, it seems to be a good size for these ported heads. i figured any valves much bigger than the gt-40 valves would be overkill with these and not be put to good use

 

[Pokageek]

Dude, I have E7's alraedy ported to match the gaskets at the intake. Would it make sense for him to buy mine and work with those?

 

[8950HO]

Since the info I gave was from a long time ago, one would sure wanna talk to peeps in the business of today to make sure that stuff still holds up today.

Lots of things have changed in that amount of time.

Seems to me, if one was gonna go to that much trouble

They outta Home Port a set of GT40's or GT40p's

Already got the bigger valves in em

Grady

True,porting GT40 or GT40P heads would ideally be the best starting point as they flow higher in stock form.

But the stock valve sizes of the E7 heads,1.78"int,and 1.46"exh,can still flow some pretty good numbers.

I don`t know if putting larger valves in E7 heads is worth the extra expense for the small/marginal increase in air flow they would provide.

Take a closer look at the Valako race head site,I think he covers this issue.

 

[tmoss]

here is a place that sells bits for $15 and up - it's where I buy mine...............

www.carbidebur.com