Do you have to use "Guided or self aligning" rockers on Vortec heads or can you use guide plates and regular rockers?

Mark

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1986 IROC LG4 "Bone Stock" (for now)

 

If you don't use self-aligning rockers, you have to replace the press-in studs with screw-ins made for the guide plates. Machining required.

 

Thanks Five7!!! Any Idea what that machining process costs?

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1986 IROC LG4 "Bone Stock" (for now)

 

Cannot be more than about 50 -75 bucks a head. Not that much machining requuired

 

After all the press-in studs are removed, the bosses will be milled to obtain a flat surface. Then, each hole will be tapped out.

How much, I don't know. Probably in the range jaretz28 estimated - you need to call. If you are putting them on your 305, you'll need them milled about .045 to bring down the chamber volume to keep compression up - the intake will need to be shaved as well to allow it to align back up to the ports. Add that to the price estimate (about $40-60/head, I'd guess).

I'd highly recommend you reconsider the Vortecs. For the same money, you could get World S/R Torquers that have screw-in studs, don't need guide plates or self aligning rockers, and a standard intake will bolt to them. They flow about the same as Vortecs. They also have the exhaust cross-over passage so your EGR will work - Vortecs don't.

 

The vortecs require self aligning rockers if you don't have guide plates.

 

I'm sorry, I guess I should have mentioned that the heads will be going on a 355 that I am building to replace my LG4. Do the SR Torquers really flow as well as the Vortecs? If SR Torquers will make the same power as the Vortecs I will go with them so I wont have to buy new rockers, intake, valve covers and such. There are so many options as far as heads go, I will take all of the input I can get. Thanks!

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1986 IROC LG4 "Bone Stock" (for now)