ThorsLT1

I was wondering if any one has used a smaller cam with 1.7 roller rockers on an LT1

suicidal racing

iTrader: (14)

i got a stock cam for a 94 and i got 1.7's on it but motor is not up and running yet do to me tossing all the fuel injection **** and converting to carb an rewireing the car.

ss.slp.ls1

iTrader: (36)

It's been done many times. Just make sure you have springs that can handle the net lift.

ThorsLT1

I guess im asking does it produce good results. Also does the idle get choppy because of the extreme lift?? My car is a daily driver.

ss.slp.ls1

iTrader: (36)

In the end what matters is net duration, lift, and LSA. Whether you get a smaller cam and use a taller ratio rocker, or get a bigger cam and a smaller ratio rocker won't matter much. What I would do if I were you is research your cam choice thoroughly, or get a custom grind. They will most likely state the lift with 1.5 rockers or 1.6 rockers. But with a custom grind, there will really be no need for additional lift and duration in going with 1.7's.

96lt1m6

iTrader: (31)

Yes this set up will work just be sure to instal NEW performance valvesprings PAC makes an awesome set...
stock cam w/1.7 rr should be roughly 525 lift, i do not suggest the use of the Lt4 springs they are only 100lbs on the seat you need 125-130....

ThorsLT1

When I bought the car it had a blown head gasket so I took the heads in to be machined. They told me that the spring preassure on seat is 145# and the C/B is .710... Now im kicking myself for not putting a new cam in when the motor was completely torn apart. Are there any cams that I could run the risk of the valve making contact with the piston??

96lt1m6

iTrader: (31)

dont be overly concerned with valve lift be more cautious of duration. big duration like 250+ at .050 begin to cause PTV clearence issues.

1toofastlt1

iTrader: (4)

is there a right up on someone doing the swap to 1.7? i heard you can use the 1.7 from a c5 z06

ss.slp.ls1

iTrader: (36)

There is nothing special about C5 z06 rocker arms. They use the same rockers that all LSx use (excluding the offset rockers used by the L92/LS3 engines). From the little research that I have done, you can use them, but because the rocker was not designed to be used on LT1's, the angle is off and they supposedly would have a side force on the valve stem that could wear out the valve stem guides over time.