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Joined: Jan 2002
Posts: 344
CEG\'er
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CEG\'er
Joined: Jan 2002
Posts: 344 |
Originally posted by SvtTour98.5-3:
I was looking for height measurements from the deck to the top of the valve cover mounting surface.
A stock 2.5/3.0L head should measure 131 �± 0.125mm from the deck surface to valve cover rail.
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
Joined: Aug 2001
Posts: 5,810 |
Originally posted by procyon:
Originally posted by SvtTour98.5-3:
I was looking for height measurements from the deck to the top of the valve cover mounting surface.
A stock 2.5/3.0L head should measure 131 �± 0.125mm from the deck surface to valve cover rail.
Cha-ching!! There's an answer that I can live with!
Where the hell've ya been lately anyway? We could use you expertise and your 'calm, cool, Clint Eastwood demeano' lol
BTW, what is your opinion after reading all this stuff??
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Jan 2002
Posts: 344
CEG\'er
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CEG\'er
Joined: Jan 2002
Posts: 344 |
Been busy at work....and buying x-mas presents! A personal project is also taking up time for the next few months.
Back to business...
The seats which were replaced not being cut deep enough seems plausible. Especially combined with decking the head and block. A thicker aftermarket gasket can help here. That helps put the cam timing back to the design location and improves the valve to piston clearance.
However, don't cut the seats too deep. You reduce the spring load and increase the risk of valve float.
My only quandry is that SVT98.5 that there was 0.050in variance on exhaust and 0.030in on intake. Ok variance is a good number to look at, but what were the measurments? Which are the deep ones and which are shallow? Seat depth measurements are normally taken with very specialized gages (it's held to about �± 0.006in at the plant). I'm guessing that the shop measured off the bowl of a valve. That can work ok for comparison purposes. But you need to measure before and after. That way you can try to put the depth back to the design height.
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Joined: Aug 2002
Posts: 310
CEG\'er
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OP
CEG\'er
Joined: Aug 2002
Posts: 310 |
That info I don't have. The most shallow (closest to the deck) were the ones that hit. He did not take measurements from the deck to the bowl of the valve yet. What he did was on the deepest ones, cut just enough to add the five angles. Then he set the rest to within about .003-.005" of each other.
Do you have any idea as to what depth they should be if measured to the bowl? Or what the minimum installed spring tension should be? These are ST220 springs over 01 3L valves if that helps in the depth measurement. Better yet, what's the installed height from the spring seat to the top of the valve stem? That's probably a better route to go provided the measurement from the keepers to the top of the stems measure close to each other.
I'm not sure if they have these "specialized gauges" but this is Dart Heads/Blocks so I'm guessing they would since that's all they do.
How do I go about finding thicker aftermarket gaskets if that need happens to be necessary? I was just using Ford 3L gaskets.
I'll put holes in him!!
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
Joined: Aug 2001
Posts: 5,810 |
You can probably run two gaskets for double thickness and they should seal well enough.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Nov 2000
Posts: 10,015
Hard-core CEG'er
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Hard-core CEG'er
Joined: Nov 2000
Posts: 10,015 |
Originally posted by Stazi:
Not sure but I'll measure it tonight. Actually I MAY have some 2.5's i the trash still out back. I'll go check.
The head I measure was ~130mm
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: Nov 2000
Posts: 10,015
Hard-core CEG'er
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Hard-core CEG'er
Joined: Nov 2000
Posts: 10,015 |
Originally posted by warmonger:
You can probably run two gaskets for double thickness and they should seal well enough.
Can you really STACK gaskets???? Sounds like a risky procedure to me... 
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
Posts: 21,197 |
No kidding. Instigator has custom copper gaskets on his Cougar... Link If it comes down to that ask him for his source.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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Joined: Nov 2000
Posts: 10,015
Hard-core CEG'er
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Hard-core CEG'er
Joined: Nov 2000
Posts: 10,015 |
I saw no mention of these copper gaskets. 
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
Posts: 21,197 |
Go to his parts list on his cardomain page.
ENGINE:
Sinter Forged Stock Connecting Rods
Ross 8.5:1 CR Forged Pistons
Clevite77 Main and Rods Bearings
Balanced Rotating Assembly
Custom Copper Head Gaskets
Ported and polished Heads and port matched
3 angle Valve Job
ARP Head Studs
Custom RC Engineering 750cc Injectors
SVT Lower Intake Manifold
SVT Upper Intake Manifold
Walbro 255 lph Fuel Pump
MAC 70mm Throttle Body
SCT 90mm MAF
Magnecore Wires
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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