heads #14102191

[smallblock283]

got them on a motor for $30.00 one place said they were swril port , efi heads will they make good horsepower with a carb or should i look some where for a differnt set. the motor is from a 1991 truck 4 bolt so i did go wrong with get them.

[smallblock283]

dont go wrong there

[spacecadet]

I looked on Mortec for the head info. Just say 87 up 350. But a set of heads for 30. You didn\'t go wrong there, I would agree. I put a link to the info, just scroll down. THere is a lot of valubale information.



Space.





mortec (http://www.mortec.com/castnum.htm)

[tracker]

swirl port 1.94/150 valves with 65cc chamber but i dont have info on the runner size.

[grimpuppy]

I believe the swirl port heads are not very desirable at all. It has been awhile but I believe they were the predecessor to the vortecs. I would still say they are worth $30 though.



Heres the article I read a while back on them:

The first attempt to create a swirl with the air/fuel mixture came when GM designed a special head for the small-block engines that used the throttle body fuel injection (the TBI engine). These engines were manufactured between 1987 and 1995, and were option code LO3 for the 305 and LO5 for the 350.



The heads have one side of the intake port formed into the shape of a ramp to put a swirl into the air/fuel mixture as it is pulled into the combustion chamber. The design works well to increase low-speed torque and fuel economy but restricts high-rpm power.



Although the 305 TBI produced 170 hp and the 350 TBI produced 210 hp, these engines have a reputation for being under-performers. Because the new restrictive heads were installed along with the new fuel injection system, the disappointing performance was wrongly blamed on the change from carburetion to fuel injection.



The intake ports on the TBI heads look pretty strange to many of us that are familiar with the traditional small-block intake ports. Not many attempts have been made by engine builders to use these heads on performance engines. Although the intake ports are large -- they hold 185 cc\'s of liquid -- the TBI heads were never used on the high-performance 305 or 350 Tuned Port Injection Camaro or Corvette engines or the 305 and 350 marine engines. These engines used heads with the traditional intake port.



Installing traditional small-block cylinder heads on a 305 or 350 TBI makes them into better performing engines. GM has a replacement head (PN 10125377) for this engine that has the traditional intake port. Externally, it looks identical -- the combustion chambers and valves are the same size and shape, it uses the same valve covers, and has the same intake and exhaust manifold bolt patterns. Installing these heads will give the engine a stock appearance, maintain the durability of the stock engine, and, at a slight decrease in fuel economy and torque, increase horsepower at the top of the rpm range.