These heads are nearly identical but the castings numbers are 1255809906.
5.3 VORTEC INTAKE MANIFOLD HOW TO
How To Change a 4.3 liter GMC Sierra Thermostat Early model Vortec cylinder heads use two different castings to comprise the primary part number of 125508060. If you have sourced a complete engine, locating your casting numbers and translating the GM RPO should be an easy task. Needless to say if you have the casting part numbers on the cylinder head of your Vortec, this makes the job much easier. The ease in which you can locate these engines and cylinder heads can often complicate matters, which is why our how to identify your Vortec engine is here.
5.3 VORTEC INTAKE MANIFOLD FULL SIZE
These versatile Vortec engines came in basically everything that flew under the GMC banner that was a truck, suv or full size van. Designed for low end torque and decreased emissions, don’t confuse this with your 1996+ Vortec engine.
The use of this vane in the cylinder head maximized flow with a vane like machined stamp in the bowl under the intake valves. This is based on the TBI engines that preceded the GEN III shortblocks, which used cylinder heads known for a terminology known as swirl vane. This is primarily because of many trucks and vans in the mid 80s having the word VORTEC stamped somewhere on the intake manifold or piping. The term of Vortec is one of the easiest terms to confuse in GM terminology, which is really saying something. How To Change a LR4 Water Pump Confusion about Vortec This can be especially important if you are trying to build a 50 state legal engine swap, like our Project 2JZ S14. Knowing how to identify your Vortec engine can come in handy when you are trying to match transmissions, intake manifolds and your ECU or PCM to your engine. The problem of knowing what engine you have exactly can be difficult, one that our guide on how to identify your Vortec engine will solve. Many times for under a thousand dollars the Vortec V8 you’ve wanted to swap into your chassis can easily become a reality.
Junkyards and wreckers have plenty of trucks and vans to pluck a LM7, LQ9, LR4, or other GEN III GM based shortblock. Vortec engines are a terrific source of engine swap donors, and if you are looking for a budget build it’s hard to beat.
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