greyghost4x4

iTrader: (10)

got some money saved up.. lookin to spend around 1200 (possibly a little more) on a set of heads for my ls1.. mods in sig. What would you recommend i go with? basicly the only street use the car see's is gettin to and from where i race at. also recommendations on gaskets too please.

thanks
Daniel

Bill'sWS6

iTrader: (6)

Call Texas Speed and ask them about the PRC Stage 2.5 5.3L heads. These should work well with what you are doing.

Also look at getting the heads milled a bit to up the CR and give you a few a bit more HP.

Good Luck!!!

camz28arro

iTrader: (12)

What about the PRC Stage 1.0 243s, they are rated to flow 292cfm at .500 lift and don't really lose bottom end and cost under your budget.

I'm wondering what the pos/neg aspects are of going with the stage 1.0 243s and the 5.3 2.5s, the chart on TSP has 1-3cfm in favor of the stage 1.0s I purchased?

ramairroughneck

iTrader: (35)

The stage 1.0 243's come standard with .500 lift single valve springs. The stage 2 5.3's come standard with duel valvesprings rated to .650. The 1.0s upgraded with duel valvesprings are $1450-not quite the bargain.

There might be a slight ptv advantge with the 1.0s if you were to run a large cam. But I wouldnt think that would be a factor with a 224 duration cam.

lemons12

iTrader: (71)

I would recommend the PRC 5.3s for your setup. The smaller cam cars do a lot better with the 5.3s and the larger cams do better with the PRC ls6s from what I have seen.

Your low-mid range will be insane!

camz28arro

iTrader: (12)

Thanks for answering my question, I already have lighter pac springs so I won't need the dual springs the 2.5's come with, I'm also going to sell the stock new springs for $50 and then the heads only cost me about $1000 shipped. Either one the OP chooses though, he can't go wrong.