Phil you are wrong on this one. A super duty block can be used with a stock Fiero head. The only thing the head would require is having the head bolt holes enlarged to take the 1/2" diameter head bolts that the SD block uses. You can also use a SD head on a stock block with no problems. Depending on which SD head (cast iron or aluminum) you use you may have problems finding an intake and exhaust manifold to fit. ALSO QUIT YOUR YELLING.
Pat
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07:05 PM
Blue Rocket Member
Posts: 243 From: Jacksonville FL Registered: Mar 2002
T-top fiero Thanks. I was woundering becuase I was thinking about alot of NOS. And I heard that the super duty block was a lot stronger. But can I use the super duty crank in the stock duke block. If I can use the super duty crank in the duke block Then the engine will with stand more stress.
Here's some information from GM Performance Parts.
10045437 Cylinder Head This 2.5 special aluminum cylinder head is a race winning design for the four-cylinder Pontiac aluminum "Super Duty" that's proven itself in IMSA road racing and Competition Eliminator Series. This rugged, lightweight head gives you Pontiac and NASCAR quality with plenty of extra metal, and proven performance with totally redesigned, super free-flowing ports. Oversize ductile iron seats and phosphorus bronze guides are standard. Intake volume is 178cc. This head accepts standard four-cylinder intake port centerline manifolds.
10049801 Super Duty Four High Port Special Aluminum Cylinder Head This version of Pontiac's Super Duty four-cylinder aluminum cylinder head's are designed for maximum-effort competition engines. The intake runners and water jackets are raised .670" to improve flow. In the Special High Port casting, the two center intake ports are moved .800" closer together to straighten the path to the valves. Both heads' rocker cover rails are raised .300", and the exhaust ports are raised .600". The valve centerlines are relocated to unshroud the valves, and the rocker stud holes are moved to match the new valve locations. The valve seats will accept 1.94-2.08" intake valves and 1.60-1.625" exhausts. The combustion chamber volume is 67cc.
Technical Notes: Valve guides are supplied but not installed. A template is provided for redrilling headers to fit the revised exhaust flange bolt pattern. An intake manifold must be fabricated to fit the High Port Special's port spacing.
------------------ Ben3843100@hotmail.com 88 GT 3800 Series II Auto 86 SC Iron Duke 5 Speed
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07:25 PM
Nov 12th, 2003
fst4rsc Member
Posts: 98 From: Farmington, NM Registered: Oct 2003
If you have a SD block, that is a fairly expensive part! Putting the stock head on that would not utilize the full potential. Spend the extra money and get an SD head? The stock head has the poor #2 #3 combined exhaust port egr passage. However, the SD head leaves the issue of a custom intake manifold. But, then you would have a really cool near complete SD set up!
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12:32 AM
ben3843100 Member
Posts: 43 From: Duluth, MN USA Registered: Oct 2003
FOR SALE Four-cylinder Chevrolet engine parts, three iron blocks (KRP/Fontana, Pontiac Super-Duty type), three SCAT cranks, MSD ditributors, roller cams, dry sump pans, three headers, Brodix CNC ported heads, titanium valves, titanium rods, aluminum intakes, much more. Over $24,000 if bought new. Asking $5,500 or please make an offer, need to sell! Call 419-445-7841 or evenings 419-445-8271 Mention that you saw the ad in Wheels of Speed when you call !
Listed 2-26-03
FOR SALE Midget Pontiac Engine, Super Duty Block With Aluminum Head. Complete Roller System, Roller Cam, Titanium Retainers. Complete Fuel System With Pump. Electronic Ignition System Or Mag. Headers And Aluminum Radiator, Plus New Motor Parts And Gaskets. Ready To Run Phone (717) 394-2374
FOR SALE Pontiac S/Duty Midget Motor, Iron Block, 801 Head, Injection, Crane Roller, Jesel, Wetnsump, 180 Cu.In. Fresh. $6,500. Call (903) 723-0678
------------------ Ben3843100@hotmail.com 88 GT 3800 Series II Auto 86 SC Iron Duke 5 Speed
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01:15 AM
PFF
System Bot
Nov 19th, 2003
Blue Rocket Member
Posts: 243 From: Jacksonville FL Registered: Mar 2002
Ok so It's taken soom time now But I got an article about building up the tech4. Inclues useing the super duty parts and other parts. If It is possible to get 120-175 out of a 4 cylinder then I will try.
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10:44 AM
Oreif Member
Posts: 16460 From: Schaumburg, IL Registered: Jan 2000
The 1977-1985 RWD 2.5L blocks are almost as strong as the SD4 blocks. They even can accept 4-bolt mains. Starting in 82 and up is when they lightened the blocks and used this version for FWD cars (and Fiero's in 1984) to decrease weight for gas mileage. I wouldn't trust the Fiero 2.5L much over 140hp due to the block weaknesses. If you do a search, There was someone who took the truck 2.5L block and built it up to 180hp. The SD4 block and heads are interchangable with minor machining as T-top Fiero has noted. You can actually use a Chevy 2.02 "fuelie" head from a V-8 on the SD4 block. KRP sells a 2-bbl and a 4-bbl intake manifold and exhaust manifold that fits the head.
------------------ Happiness isn't around the corner... Happiness IS the corner.
[This message has been edited by Oreif (edited 11-19-2003).]
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04:31 PM
Nov 23rd, 2003
The_Stickman Member
Posts: 93 From: Allentown Pa USA Registered: Jan 2003
YES YOU CAN. I have all these parts so I know for a fact this can be done. You can't use a stock intake on an SD-4 head though. You should also use the SD-4 head gasket just because it's better than stock. Just make sure you use the one for he iron head and NOT the aluminum head.
