Valve job on heads?

[DemonGT]

bought a 89GT last fall...put it away for the winter and forgot about this heaping pile of receipts the guy gave me..anyway

on this one for a cylinder head place it says
cylinder heads (checkmark) valve job high performance $135.00
cylinder heads (checkmark) resurface $48.00

what do these to things mean? and why would some one have it done??

 

[Rick 91GT]

It must have needed a valve job after years of use, or some damage occured. Resurfacing/milling was done to ensure they were perfectly flat and it had a nice new sealing surface.

Standard stuff...

 

[DemonGT]

according to the receipts etc...they should have been new heads....motor only has bout 2500 on it...

the heads were bought 7-23-03 and the date from the head shop is 3-26-04 for the valve job etc....

just trying to do some detective work with this car....have a folder a inch and a half thick with receipts

another odd thing...is he bought one of those conversion kits..the one with the oil pan and pump and pick up and water pump, front cover.....weird, why would he of just reused the old pan?

you might think why didnt i ask but..the guy i bought the car from only had it for the summer of 04..he had another mustang and had to give one up...so he desided to sell this 89GT..the guy he bought it from did everything

and whats a "high performanc" valve job?

 

[Rick 91GT]

What heads are they? They could have blended the valve job or added additonal angle to make them flow more, the dfifference in a High performance valve job is the multiple angle, machinery Serdi, etc...

 

[thumper460]

Valve job is a 45* seat cut, and a 45* cut on the valve.. usually the exhaust seat is in the middle of the valve and the intake is just a little to the outside of the middle of the valve... made to last !! a performance valve job is... 3 angles on the seat.. 15-45-60 and 2 angles on the valve Int. 27-45 and the ex. 30-45 ! the seats are out towards the edge of the valve to increase the low lift flow at the valve.. this can be worth 30-45 HP alone!!!!!! Some performance valve jobs are from the late 60's and dont have the flow cut on the valve.... some perfrormance valve jobs have the flow cut on the valve..... todays are a radious with a cutter and putting the cut way out on the edge of the valve... the size of the cuts and the seats are ALL critical... thus the cost!! Usual valve job is 85-95, performance can be 195.00 -350.00!! and it is all HP!!

Just me...........................

Thumper

 

[DemonGT]

they are the TFS twisted wedge heads...on that same receipt i think it had a "additonal parts" and it says $23 for seals and $8 for spring shims???

just seems odd that the guy who did the work bought everything new...like he had nothing to reuse.....that conversion kit has a oil pickup with it, but i found a receit for a oil pick up tube..wtf? and alot of the stuff was bought from dealer ships....he even bought the cap,rotor and wires from the dealer

P.S. car has the stock 2.73 gears..i have 3.73's for it to be put in this summer...but the car seems pretty slugish for the mods it has...but i just blew it off thinging its cause im use to my car?

 

[Rick 91GT]

Upgrading seals is a good thing and once they get taken apart they have found some that were damaged, shims will help them set the pressures correctly.

It sounds like someone atleast put some effort in making things right, I really wouldn't worry much.

 

[DemonGT]

yea i guess it seems that way, i probubly shouldnt worry much...seeing as the guy saved alost every receipt possible he odviously must of taken care of the car and did things right...

P.S. whats the best way to clean the IAC?

 

[dastang2]

those 2.73 gears are hurting you and making it feel slow, with the new gears you have you will see the difference you want.

 

[DemonGT]

iv also heard that using the 70mm cobra maf the car has to be running the cobra EEC also? as far as i know the guy DID put a cobra EEC in the car...but i guess ill have to check forsure....what do i look for to know what EEC it is?

 

[Rick 91GT]

You can run a stock Cobra EEC as long as it has 19lb inj in it, the Cobra meter is a 19lb calibration and the Cobra computer took care of the 24# calibration.

Just look for the code on the computer, stock was a A9L, A9P, or a A3M, can't recal the exact number for the cobra but it has a Z in it.

 

[DemonGT]

humm....as far as i know the car has the stock EEC still but it has 24lbers and the guy said it has a cobra meter? unless it actually dose have a cobra EEC...or the guy is full of it and its not a cobra meter...ill have to messure the diameter of it when it gets warm out....if it IS a cobra meter with a stock EEC how would the car run or act?

 

[dastang2]

all i know is you need to have the MAF calibrated to whatever # your injectors are. and i hear you can use whatever eec you want as long as it is the right operating system and motor.