Hi, my question is.

Can the swirl ports from LO3 go on LO5??? I know they can bolt up, but how would the LO5 react to it. Is it worth it???
The only reason I am asking this is because I had my lo3 heads redone and they are basically brand new. Once I got the 350 I just did not have any money to get 193 done. Would higher compression help or hinder the flow. Please explain this to me since I have no idea.

I searched this, and all I found is compression bumped up, but no answer to if it would work, is it worth it... pretty much they all ended up abruptly without answer.

Bare with me if I missed something.
Thanks a lot.


Oh, and if you recomend TPI heads, let me know where I can get them for cheap??? Or if you are selling them.

 

They'll work but you need to calculate the CR with them to make sure that it isn't excessively high (above 10:1 for example). You may need to run a thick head gasket anyway. The LO3 swirl port heads have 1.84" dia intake valve (vs 1.94" on the LO5 heads); the exhaust valves are the same. The smaller intake valve means that you will be more flow limited than if you had the larger valves BUT that's only a problem if you are using a large cam. You p[robably aren't using a cam large enough to allow the heads to really limit the airflow...... why? Because there are a number of people here with 305s (Dewey316 for example, who has unported LO3 swirl port heads yet still made 208 rwhp with intake/cam/exh mods) that still make decent numbers (dyno, track). So you can do as well powerwise as them, and you will also have more torque than them (because you have a 350). Your combo won't be optimum, but it will be cost effective and should still run well (so long as you retune the ECM to handle the mods).

Search on calculating the CR, and measure the volume of the chambers on the heads you had done (you'll need it). BTW what did you have done to them?