96ta

first of i have read all the stickies which is part of the reason i bought the book. any who they are a mix of questions i apologize

I see heads that are flow tested at .600 lift. if im running a cam with more than .600 of lift will it run out of breath?

from what ive been reading about cams the lower the lsa the better the street manners are is this true?

has anyone had any experience with the comp cams XR275hr 222/224 .566/.568 112lsa? if you have how is the surge/driveability/ can it pass it emissions(i know this has alot to do with the tune as well)

has anyone heard of RHS racing head services?

96ta

no one?

96ta

ttt id really like some answers please....

BIG_MIKE2005

iTrader: (116)

Weather your heads flow more or less @ .600" has nothing to do with the above statement. It's gonna come down to your head casting, port/polish job & valves. If all are combined properly your heads can be made to flow very well after .600" lift.

I don't have the cam you mentioned but my 224 cam is on a 114LSA & I love it. It almost sounds stock at idle, has almost zero surge & driveability is just as good as it was stock.

teke184

iTrader: (5)

just because the heads were only flowed up to .60" doesn't mean they will suck above that. they may not be optimal for that much lift but they'll still work.

lower lsa makes for a rougher idle...and i think tends to bring the peak power lower into the rpm band. how that affects your idea of drivability...is subjective.

that cam you listed is pretty small...i don't see why it couldn't pass emissions with the propper tune and cats. driveability should be near stock with the right tune. guys get stock driveability with 23x cams.

bczee

iTrader: (12)

In General the smaller LSA does created a more rougher idle as compared to the larger LSA.. but it is the combonation of all of your cams timing events that will factor in smooth or rougher idle.. The larger LSA will tend to blead off some of the compression at idle and will help smooth out the idle.

Irocss85

iTrader: (1)

I think your confusing duration with LSA. duration is that 222 # you mentioned. its the # in degrees that represents how long the vale is open for. the longer its opened, the larger the duration # will be, and the more it will affect driveability. that cam is extremly close to the very common 224/224 cam of yesterday that everyone and his brother had. great cam if you want great driveability and a little more power in that order.

RHS is a huge head company, but Im not familier with there LS1 products.

96ta

so then the cam would be considered on the low side of mild?

BIG_MIKE2005

iTrader: (116)

Yes, that cam is considered small in the LS community. It would be big by old school motor specs, but not these motors. Your not really considered running a big cam until you go past 23x/23x .6xx/.6xx, then your getting serious in cam size.

Irocss85

iTrader: (1)

thats the great thing about these engines. they run very strong and make tons of power compared to older technology. my suggestion is to find someone local that has a cam, see how his car rides and what he likes/dislikes about it and make your decision from there. but if you have to pass smog testing, you will be limited for sure.

96ta

o another question i keep seeing people talking about reverse split cams whats the difference between those and a regular cam.

Irocss85

iTrader: (1)

split and reverse split refers to the duration #s. old school cams were prettymuch all the same intake and exh. duration. such as 224/224. splut duration cams have the exh. duration longer then the intake. such as 224I/227E. a reverse split has the intake ope longer then the exh. side. 227I/224E. typically, engines in streetcars like split duration because the exh. side is harder to get great flow due to exh. restrictions weather noise levels or packaging keeps the exh. from being the optimal size. on the other side, we got tons of heads with large to huge intake ports and aftermarket intakes to let in as much air as possible. so if you got lont tube headers and dual 3" exh., you wont need a split duration cam, or it wont be as beneficial as it would to someone who had mannifolds and stock ypipe. just a couple examples every engine is different. thats why you always see people saying saying talk to the cam experts. caues they will find out your total package and add that info to what you want out of your engine/car to try to find you the best match.