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vortec head swap on 305

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Old Mar 30, 2009 | 05:51 PM
  #1  
rojas1826's Avatar
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From: Illinois
Car: 86 iroc-z
Engine: 305 tpi
Transmission: 700r-4
Axle/Gears: 2.73 lsd
vortec head swap on 305

i got new vortec heads from jegs and the edelbrock tpi vortec intake manifold the heads did not come with rockers, pushrods and bolts and my questions are: will the rocker arms and pushrods from the lb9 fit into the vortec heads or will i need diferent ones? can i use the stock headers until i come up with enough cash to purchase new ones? and what is a good camshaft for this setup?
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Old Mar 30, 2009 | 10:09 PM
  #2  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
'86 LB9, correct?

You can't use the '86 rocker arms. Vortec heads (these are stock GM heads, correct?) use self-aligning rocker arms, which were used on '88-up engines. Easiest thing would be to buy new ones for '88-up.

The pushrods would be fine, but it's usually recommended to replace them when replacing the rockers. Use '86 pushrods.

A Comp XE262 would be a nice upgrade over the stock cam. You'll need new lifters as well.
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Old Mar 30, 2009 | 10:26 PM
  #3  
Nub383's Avatar
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From: Madisonville, Ky
Car: 94 Silverado
Engine: 383 Vortec TBI
Transmission: 4L60
Axle/Gears: 2.73
Re: vortec head swap on 305

The stock exhaust manifolds should bolt up. If you do swap cams, don't forget to break it in!
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