I have a 92 RS with the LO3 engine and am wondering what the CC of these heads were, and also if it would be beneficial for me to get the Vortecs when the new TBI Manifold comes out. What kind of power gains should I see with these mods?

 

I think they are 51cc's. If you put the vortecs on a 305 you have to mill them 45 thousanths. stock vortec heads are 64cc's. hope this helps. You can get 325HP out of a mild 305 with vortec heads and performer RPM intake and a 600CFM.

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104

[This message has been edited by vortecfcar (edited November 02, 2000).]

 

hot rod magazine CC'ed the heads on their "F notes" project RS in 89 at 55.3 CC's

 

What is the purpose of milling the heads?? Does that change the cc's?? What cc heads do you wanna put on a 305 block?

I heard that the stock 305 TBI heads are 58cc


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Godti
'89 Trans Am (Red)
305 TBI 5spd

[This message has been edited by Godti (edited November 03, 2000).]

 

car craft did a tech on this engine build up. Milling the heads will give you back the compression you lose by bolting 350 heads on a 305. It'll bring the cc's down if thats what makes sense.