Fbody1

from going from 1.6 to 1.7 RR w/hotcam, I have crane 10308 springs I think that they can handle the xtra lift.is there any side effects to this, I drive the car everyday so it needs to be dependable, thanks

Kevin97ss

I cant comment on the dependability, though I will say this. I just put 1.8 comps on my hot cammed motor and it idles and drives the same. I dont have many miles on it yet cause life is getting in the way and its not my daily driver but the power increase seems excellent. I gave it a quick romp in 2nd gear at a 15mph roll and it ripped the tires loose with ease, something its never done before.

RE AND CHERYL

I would make sure the springs will handle it. You new valve lift would be .557. .328 lobe lift * 1.7.

The 1.7 rockers should pose no issues provided they are quality pieces. I'm not sure what the lift limit on those springs are, but it would be easy to find out. The closer you will be to the springs max lift, the harder it will be on them.

unvc92camarors

where'd you find the 1.8s?
i've seen the ones for the ls1 but never knew they made any for lt1s

Kevin97ss

The 1.8's are comp cams Hi-Tech stainless. Specificly made for a standard small block chevy they work on LT1's like any other SBC rocker. The only mod I needed to make was to the GMPP guideplates to accomadate the closer position of the push rod.

unvc92camarors

so nothing changed? that's pretty cool
you're springs are holding up fine to that? seems like a lot of lift
how much did they run you also and how did you go about modifying the guideplates?

Kory 88 Iroc Lt-1

I've got a set of 1.8s for sale if anyone is interested. They are the same ones as above. 250 plus shipping. pics available upon request.
Kory

Kevin97ss

so nothing changed? that's pretty cool
you're springs are holding up fine to that? seems like a lot of lift
how much did they run you also and how did you go about modifying the guideplates?
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Well alot of things changed, studs, pushrod length, the use of guideplates, and the rocker it self. I already had adequate springs for the application. .591in net lift is'nt too bad for a street application with todays springs especially with the hot cams lazy lobes. The guideplate mod was easy just very time consuming using a drill and file.

Fbody1

do I need to change to bigger studs , or will the stock ones be ok, and how does the studs come out( screw in or press in) ?

unvc92camarors

i might have to think about that when i get enough money to actually do something to my car again

and now back to the topic at hand...

Kevin97ss

do I need to change to bigger studs , or will the stock ones be ok, and how does the studs come out( screw in or press in) ?
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I would say its mandatory to run a good 7/16 stud such as ARP pro series. If its an al. LT1 head then its screw-in. If you have the impalla iron heads then it would need to be fitted for screw-in studs.

Edit: also I am running comp-R series lifters. Weather or not its nessassary I cant say because it depends on the spring pressure. Just remember that not only do 1.8's increase the lift mutiplication but the spring pressure the lifter and cam sees too.

Fbody1

is there a stud that will screw in that is 7/16 with out needing to be tapped out ?

kgkern01

So all that is needed to run 1.8RR on stock cam is hardened pushrods, guideplates, 7/16 studs, and better springs? Is this correct?

krispy

maybe new retainers and locks too, but those arnt much

Kevin97ss

is there a stud that will screw in that is 7/16 with out needing to be tapped out ?
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The factory LT1 studs are 7/16 bottom(head side) and neck down to 3/8 on the rocker side. A full 7/16 stud is all thats needed, no drilling or tapping


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So all that is needed to run 1.8RR on stock cam is hardened pushrods, guideplates, 7/16 studs, and better springs? Is this correct?
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Yeah pretty much. Just make sure you do your homework before ordering any parts. Big block rockers will not work but are commenly sold as 1.8 chevy rockers and may not specify that they are for BB's only. The only 1.8 rocker for SBC/LT1 applications that I know about is the comp Hi-Tech stainless.