New valve springs or not?

[RedogOnyx]

OK I bought Fuller's old heads and ithey have LS1 springs on them.

I know they are go for .500 to .510 lift, but I want to get the head's flowed before picking my cam. Should I buy the springs first, then get them flowed, or flow them, then buy the springs? Will the springs hamper the flow testing if the heads can flow better than the .510 lift?

I want to get the best cam to match the heads. I've never done this before so IDK if the springs will need to be bigger or not? I know Fuller had a 1280 cam on his car, but since WOT-Tech changed to cam page, IDK what the specs are for that cam. If I can get away with these springs that's awesome, but if I have to change them, that's cool too. I'd rather pay and get it done right the first time

[asylummotorsports]

Valve springs have nothing to do whatsoever as to air flow!!

Do you really know what you are doing?

[RedogOnyx]

When it comes down to heads, no

That's why I asked

[mfuller]

I would get them flowed first, and then use the Camshaft selection service to find out which cam profile will work best, and whatever cam profile you end up wih will dictate if you need to change springs.

[91LQ1Lumina]

Just for some more info, is the head flow benched without springs installed? Therefor the operator of the flow bench would then tell you at what point you have the best flow with the valve right? Assuming all of that you would then pick a cam with the right lift for optimal flow and the duration for the power band that you want? Thanks for any replies I just want to make sure I have this right.

[SappySE107]

Heads are flowed with test springs.

The LS1 springs are pretty weak and should be replaced for any performance cam. As Matt said, get the cam figured out, then buy the springs. Otherwise the cam is limited to the springs you are using.

Flow is a part of the cam selection, but not nearly everything. We don't have the option for a radical lift cam that has full lift almost instantly and then use the duration at the peak flow. It would be a track only type cam if we did.

[Superdave]

Agreed.. Cam first, then springs.