I over nighted my 1.7's yesterday. Those things are huge . I had to clearance the stock valve covers, just in case. I used stock lenght pushrods, but harden ones from thunder. They have a rocker humm that can be heard from the other side of the traphic light . I adjusted and readjusted them three times. Twice 1/2 turn past 0 lash, then the third while the car was running, 1/4 turn after they shut up . The car pulls hard now 3500-5800. From what others have said they help alot and i should expect some better times or at least some mph. I will let ya know tomorrow after the track how much they helped.

Two weeks ago
Open Headers
13.3 @103.7
1.9 60ft

Last week
Headers and duals, with Ls1 ram air
13.1 @ 106.1
1.9 60ft

Estimated for tomorrow
1.7 RR, underdrive pulley, Retuning for the 1.7's
12.9 @ 108

Come on 12's. Its hard with an altitude of 3600ft, and a DA of 5500ft.

this is just to let eveyone else know, no problem yet, and she is faster

 

awesome dude.... you got any part numbers? What springs do you have? Ovate ones?

thanks

 

I used hotcam springs my lift with the 1.7 is only .510 .521 hot cam is good to .525. You dont want to put to big of springs it robs hp. Gm used .525 springs for a .525 lift cam.(hint)

Scropion 1.7 RR -1026 $222
Thunder Racing part numbers
Gm guide plates-20- 14011051 $24.
Harden push rods Comp, 7.200, -63-7808-16 $35.
Arp 7/16 Studs- 113-134-7103 $28.

 

your response is trully apreciated. Thanks for the part numbers.

Marvin

 

NOTE!!!!1

If you adjust the rockers loose, the poly locks/nuts will hit the bottom of the valve cover, some.

I had to bang the inside of the covers out some, just enough to clear. YOu could probly just adjust the rockers tighter, and you might not have any problems??

Jsut food for thought

 

Will they clear stock LT4 valve covers?

 

cool

 

I'm not sure if the lt4 covers are taller or not? You could adjust the rockers tighter than i did (1/4-1/2 turn past 0 lash) and they might not hit.

Sorry all i know is not enough