Promaro

I have a stock LS1 that has a P1 on it, I plan on doing some work to it before the spring time, I have already ordered a cam from Texas speed (228/224 .581/.588 LSA 114) I am putting a Walbro 225 fuel pump in it and I think I am going to have to put some 60lb injectors on it also. My question is the heads, are a set of 317's really worth putting on? Or can I keep the 853's on it and be fine. Either way I am planning on upgrading the valve train so that will not be a factor. Also plan on putting a smaller pulley on the P1 to get 9-10 pounds out of it.

vettewreck

iTrader: (1)

Im in the process of building my motor so I don't have exact experience yet, I can say that for the cost of the heads ($200 bucks) they sure as **** can't hurt you. From all the reading ive been doing just seems to be a great flowing head.

Ryans99ls1

iTrader: (16)

On your build, no. But as with all builds, youll probably keep taking the car further. If you plan on more power down the road, it wont hurt anything to throw them on. The main reason 317s get thrown on is because what people really want is better headgaskets and headstuds and while the heads are off you might as well throw on a cheap upgrade headwise.

If you are going to keep the car relatively mild, dont worry about swapping them out. I made over 600 with my 853s. I put on 317s when i put ls9 gaskets and headstuds in

Slowhawk

iTrader: (12)

I wouldn't on your car. The lower compression will drop power, then you'll add boost to get it back. Kind of a circle.

LT1RAY

iTrader: (21)

I would have reused my 853's but I have a early 99 with the notched heads. This means you can't run a MLS type head gasket. So I picked up a set of 317's (only because they were the cheapest non-notched heads I could find) along with a set of head studs and ls9 gaskets. Doubt you would notice a power difference between the two heads.

Promaro

Thanks for inputs guys. I'll probably stick with the 853s for right now. When I put more boost to her ill do the swap.