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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: dieselman123 on February 22, 2014, 01:00:28 am
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im currently building a sbc 350 and the question I have is that I plan on getting some vortec heads and I wanted to know will sbc 305 push rods work with them because I have a complete engine with parts and was wondering if those were interchangeable with vortec heads. also can anyone tell me what are the ring gap specs or do I follow instructions that came with the pistons. thanks in advance
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Follow the instructions for the pistons however, make sure that any technical specs given with the pistons match factory specs IF it is still factory. If not factory then make sure specs match your application. For example, I used a gm crate block, however it was bored .030 over, so I used pistons and rings that are made to accommodate the increase in cylinder size. So my pistons and rings were for a .030 over bore engine.
For the pushrods, make sure they are all in good shape, not cracked or anything. Then check there measurements, length and diameter, be sure they match your application. If it's not gonna have much power stock is ok. If you have power, you should look into better ones. A friend put stock pushrods in a 340 hp ford 302, rubbed against the pushrod guides and broke one going 60 mph. So I used solid one piece chromoly pushrods from Comp Cams and made sure my guides had proper clearance. They should have a set to match your build. Including Summit Racing, Lunati, Edelbrock etc and even GM Performance parts.
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does anyone know the pushrod standard spec for vortec heads like the length diameter and does factory vortec heads need or have guide plates
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The pushrods should be the same but you need guided rockers for the Vortecs.