ok. i just picked up a set of heads froma friend of mine for my 350 i am going to be rebuilding. the heads are vortec and need a rebuild. this is the info i got on the heads are they good heads?

10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves


thanks

 

How much did you pay for them? A brand new pair can be had for a little over $400 from your local friendly GM dealer.

Whether they are "good" depends upon who you ask.

The pros are that they do flow well, have raised intake ports, and have a revised combustion chamber shape. They do have accessory mount bolt holes on the ends, and "standard" SBC exhaust will bolt up to them.

The cons are that a Vortec-specific intake manifold is required (not a lot of choices there), they are factory-quality truck motor castings, the valve springs are junk if you have any kind of a performance cam (more than ~.460" lift at the valve), the rocker studs are press-in and should be converted to screw-in if a performance cam is used, and they require self-aligning rockers. If you have emissions concerns, they don't have exhaust cross-over passages, so you have to plumb exhaust up to the intake manifold for the EGR valve to work.

They also require center-bolt valve covers. Whether that is a pro or con - ???.

That's about it. You decide if the pros outweigh the cons.

Who put the 350 in your car?