porting heads?

[TurboVaderT]

first off, I would like to say hi to all i am new here i have been just hanging out and surfing the turbo buick pages. I own a 87' Turbo T with 97k orginal miles. I bought it from the orginal owner he changed the oil every 2k miles and his wife drove it almost all the time. I removed the motor to replace the rear main seal and since it was out i though i would check it all over. The cylinders have original cross hatch in cylinder walls and pistons have almost no scuffing at all. But it does need a valve job so im going to put manley severe duty valves in it. Now down to the question is there anyone who has or sells temp plates to port the heads out. I have some experience porting heads SBC mostly. But i just wanted alittle guide to porting. Also should i block the EGR passage off and remove it from the intake(no emissions here in NY) is it worth it? what other little things are good to do. It has the stock turbo. Is that a T03?? i just want a rebuild kit for it. It doesnt have much play in it but i might rebuild it anyway. well thanks for listening to me ramble on here. sorry i asked alot of question. Any advise is welcome thanks

~turbovadert~
87' Turbo T 97k all orginal

 

[1970gsx]

This may help. http://gnttype.org/techarea/pictureguides/heads/headguide.html

 

[wickedtt]

first off, I would like to say hi to all i am new here i have been just hanging out and surfing the turbo buick pages. I own a 87' Turbo T with 97k orginal miles. I bought it from the orginal owner he changed the oil every 2k miles and his wife drove it almost all the time. I removed the motor to replace the rear main seal and since it was out i though i would check it all over. The cylinders have original cross hatch in cylinder walls and pistons have almost no scuffing at all. But it does need a valve job so im going to put manley severe duty valves in it. Now down to the question is there anyone who has or sells temp plates to port the heads out. I have some experience porting heads SBC mostly. But i just wanted alittle guide to porting. Also should i block the EGR passage off and remove it from the intake(no emissions here in NY) is it worth it? what other little things are good to do. It has the stock turbo. Is that a T03?? i just want a rebuild kit for it. It doesnt have much play in it but i might rebuild it anyway. well thanks for listening to me ramble on here. sorry i asked alot of question. Any advise is welcome thanks

~turbovadert~
87' Turbo T 97k all orginal

What do you mean Also should i block the EGR passage off and remove it from the intake(no emissions here in NY) ?

 

[bison]

Templates wont help you much. You need to get under the valves to get big flow numbers. Its the same as a SBC with a small hydraulic cam. You need to get the low lift numbers as high as possible. A proper valve job with the manleys will net you a 10% increase without touching anything else. Pull a valve out and look at the bowls. You will see how bad the stockers are, especially the exhaust. You will gain little buy opening up the ports. Just make sure theres a smooth transition from the intake to the head. Smooth out the the combustion chambers and blend the area right where the valve job starts on the combustion chamber side. The biggest gains are cleaning the mess under the bowls up and the valve job. Remove the restriction on the intake around the injector pads. Polishing the intake floor doesnt do much at all for flow.

 

[UNGN]

If you've ported a set of heads before, buicks will be pretty easy as there is a lot of really bad stuff that can be kind of corrected, but the general shape is pretty much hopeless (unless you are a porting god) so you just make the best of them.

As Bison said, blend in a good 3 angle valave job, remove the obvious chunks of casting slag and die standoffs, smooth the pushrod pinch and the top of the ports, leave the floors alone except to improve the shortside radius.

Concentrate on the bowls and the flow around the stem.

You can fill the EGR with a piece of aluminum barstock, if you want. I'd like to see how much this improved flow on those cylinders...it probably isn't tremendous.

The Power Source porting templates only really deal with the width and the height of the ports. You will get pretty close to these just by Eyeballing it.

 

[BRAD_PADGETT]

I went to a porting god and paid the price. The machinist specializes in Buick racing motors. I had the intake ported and matched to the new racing heads which were ported as well. The flow on the heads increased 37% over stock both on the intake and exhaust side. Well worth the money but it was not cheap-$1600. Brad

 

[bison]

I went to a porting god and paid the price. The machinist specializes in Buick racing motors. I had the intake ported and matched to the new racing heads which were ported as well. The flow on the heads increased 37% over stock both on the intake and exhaust side. Well worth the money but it was not cheap-$1600. Brad

They should have got a lot more on the exhaust for that many $. 60% or more increase is not uncommon. Stock exhaust flows are only 105-110cfm. Ive seen numbers over 170 cfm at .500 lift. Champions are around $1300 and hit 165+cfm ex., 205+cfm in.

 

[DMan]

I had my 100,000 mile factory iron heads ported/polished and big-valved by the same guy Kenny Duttweiler farms all his head work to.

Valves are now 1.77 intake and 1.50 exhaust

Flowbench readings after the job was done: 208.3 Cfm intake, 167 exhaust at .500 lift.

excellent workmanship* and very reasonable prices >

Mackenzie's Cylinder Heads - Oxnard CA. One man operation.