well i know vortecs aree good but then i nedd a vortec manifold and tbi adapter.what other heads will bolt on to my manifold?87^ center bolt heads?also if i runa carb manifold with adapter how will i put my nitous plate? on the bottom of the tbi and on top of the adapter or under the adapter and then on top of the carb manifold but then i will nedd a carb nitrous kit?

 

people say great things bout the world products 305 sr torquers. think theyre around $600

 

due the valve placement on most aftermarket heads, you very limited witha 305

World Torquer 305
and Vortec are about it.

if you are getting a new manifold, you can go with just about any head as long as the valves clear a 305. just get the manifold for the correct heads.

other populare ones are

lg4/l69/lb9 (pre87 heads)

also the lb9 heads from 87+ are centerbold. these heads respond very well to port and bowl work.

as for the nitrous. i personaly think you are better off with the TBI plate, on top of the adaptor, this way your spray patern is centered with the throttle bores. be mindful of hood clearance with both a spacer and a nitrous plate though.

 

so on top of the adaptor and under the tbi so it flows just like the tbi correct?and going to get probaly vortec heads but i have lb9 heads but i need to find out a exact price to port and polish them.do u know how much cc'c do the lb9 heads flow?

 

cc's are not flow, the cc's of the port is the physical size of the port, the flow is measured in CFM, and no sorry i do not have the specs on teh lb9 heads

 

what the cc on the lb9 heads like 76 -56 ?and air flow like 170 -200?

 

since i screwed my self from the vortecs i will most likely get the 305 tpi heads from the lb9.
or i will get a 350.

 

it is likely more opposite. something online the lines of

intake 170cc
flow 130CFM

or something along those lines. like i said i don't knwo the specs on the heads, do a search i am SURE someone has posted specs on those heads.

 

You can basically run any head you want, except the heads with 2.02/1.60 valves you can't run high lifts past .550" Some say staying safe with .450" lift with 2.02/1.60 is better but I have mocked up this setup and .550" is the safe lift. Flow may be obstruced by cylinder walls but the offset of the bigger valves hardly makes a difference. I myself run WP 305 Torquer heads and have had good success with them.