CRN-10308-1 Crane Aluminum LT1 Head Valve Spring Kit
fits stock head without machining, good to .600" lift, includes retainers, seats, and locks $179.97

 

sorry if you misunderstood. i was saying that they could handle that much lift... not that i was gonna go with that much lift on stock heads

and im still wondering if it is safe to go with the 3/8 studs and the stock pushrods...?

 

Me too. I'm not going to be doing heads/cam anytime in the near future. I'm wondering if it's necessary to upgrade those pieces.

 

lol us fl boys are either cheap or poor... i guess im a little of both...

 

I recently did change my rockers as well. Here a re a few pics of the Scorpions installed and compared to teh LT4 1.6 rockers

http://www.9t4z28.com/scorpions.htm


Please not that the guide plates you see in some of the pictures are not correct.

 

hey stagen..... did you notice any difference with the 1.7 instead of the 1.6 that came with the hotcam???

and does anybody rec. NOT installing 1.7??? i can see maybe for hotcam guys or bigger.... but 1.7 on a stock car?? would there be any problems going that big??

 

Yes, there was a noticeable SOTP difference but also keep in mind I'm not stock.

If doing this to stock heads I would think you'd need to change the springs. You are definitely going to have to change the rods (hardened) and add guide plates. You'll see a gain but not as noticeable as you would with worked heads and or CAM.

 

I'm wondering when I go with ported heads if I should set my Cranes to 1.7 or 1.65. I don't want to much lift on a XE cam. any suggestions?

 

I can't see a problem on installing them on a stock car or on a car with a small cam thats lift isn't to high as long as you get all the other parts to do the install correctly. I wouldn't install them on a cam that already has high lift because you don't wanna go to high.

 

Actually when i do a cam swap im going to go donw to 1.6s,maybe even 1.5s. but im not going to be doing a cam until i build a new motor which wont be for a few years.....the cam im looking at is a new grind just out by thunderracing......

 

well you can use the stock studs, but they will have more of a chance being broken than using 7/16th studs. alot of people use stock studs with 1.6 rockers without problems but the 1.7s are def more extreme. they put more stress on the valve train,ex the studs more than 1.6s do. its kind of a 50-50 chance going that way......

 

I think it might be possible,but with that kind of ratio your going to increase the valve guide wear greatly..........i would def spare no expense on springs and maybe even some chromoly pushrods instead of hardened......that would make the stock cam lift increase to around 550 on the in side and .574 on the ex side......you would def need 600 springs. i wod say if oyu have another car to drive when that one breaks, go for it. you would be the first one to use 1.8s.....

 

I have to disagree there......

like you noticed a sotp difference after switching from your 1.6s,imagine the difference i feel with going t 1.7s from stock.......the fastest bolt on lt1 in the country(SAR2K) ran a similar setup and went 11.9 with a stock lt1.........i figure these rockers with some mild port work would have the ability to put you in the high -maybe even mid 11s.......its not how much work you do to the car, its the quality of the work you do.......

 

Hmmm, I thought you could get these in self aligning, in which case guideplates shouldn't be necessary.

How well are they working out for people?? I may consider a swap for my Pro Mags if the gain would be worth it. I looked at the specs of my 224/230 and the lift would be taken to 270/278. I know the heads are flowing REALLY well at that point. Could be interesting.

If you already have your heads set up, you should be able to just swap rockers.

 

They dont make this ratio in self aligning yet,i don think they are going to for quite awhile if at all