Spiers

iTrader: (7)

They are on Summit, eBay, Flatlander, etc... pushrod length should not change but should be measured just in case. Your spring choice will be based on the cam you're running. With a stock cam you wont NEED the Patriot Extremes.

defaultexistence

iTrader: (11)

givin my 2 options listed below which one of these springs will be the one to go with for a 93's stock cam and 1.7 or 1.6 RR's? and why?

choice1
* OD: 1.268"
* ID: .880"
* Average Coil Bind: 1.135"
* 130 Lbs @ 1.790"<-- valve closed pressure
* 330 Lbs @ .500" Lift
* 345 Lbs @ .550" Lift
* 360 Lbs @ .600" lift
* Made in the USA.


Works with many hi performance hydraulic roller cams.
For use all the way up to 244 degrees duration @ .050" with up to .600" Lift @ the valve.

choice2
* OD: 1.268"
* ID: .880"
* Coil Bind: 1.120"
* 130 Lbs @ 1.790" <-- valve closed pressure
* 330 Lbs @ .500" Lift
* 350 Lbs @ .550" Lift
* 370 Lbs @ .600" lift
* Made in the USA.


Will work with most hydraulic roller cams.
For use all the way up to 244 degrees duration @ .050" with up to .600" Lift @ the valve.

Spiers

iTrader: (7)

Either one will be fine

defaultexistence

iTrader: (11)

so ,will PR length going to change on a stock cam 93 lt1 T/A with 1.7's? anybody? fixing to order some valve train stuff...

Spiers

iTrader: (7)

The pushrod length should stay the same. But double check anyway! If I were you, I would go ahead and order 7.2"...then put it all together and mark your valve tip with a sharpie...check your sweep pattern and make sure its centered and narrow as possible. It most likely will be. But I wouldnt just throw it together without checking.

defaultexistence

iTrader: (11)

opinion Time!!
180,000 on the clock ,should i replace the lifters at this time along with the new upper valve train components or wait till i have to fix a manifold leak ?
"not that i have one" and stock PR's are ....7.2? or...i'm having a brain fart..

Puck

iTrader: (17)

I would replace them just for piece of mind. Better safe then sorry, and lifters are a relatively small expense.

Stock pushrods are 7.2", and COMP makes some cheap hardened ones that work fine for most builds.

1961ba427

iTrader: (26)

Any thoughts on running Comp Cams #987 springs with a CC503 and 1.7 RR? That's the plan for my SS.

Looks like my gf's Z28 will be getting #26918 springs with a XFI466 and 1.5 rockers for now 'cause we have them already...switching to 1.6's later.

DisturbedTA

iTrader: (3)

what about a stock 95 with 1.7s and lt4 springs will that work?

1961ba427

iTrader: (26)

That would probably be alright, but I wouldn't do it unless I already had the lt4 springs. Otherwise, you are better off to buy better springs to start with. The LT4's are not known to be very good for anything more than the Hotcam kit, or stock cam & 1.6's.

96capricemgr

iTrader: (1)

Springs have to handle more than just lift. Rate of lift and drop back to the seat play into it. I really do not know the rates on the stock ramps but while the LT4s will handle the lift you would be asking I would not assume they can handle the speed with which the valve will be moving.

DisturbedTA

iTrader: (3)

understand ok ive already have the springs and im wornking off the rockers now so i thought id ask thanks guys and 96

Rob94hawk

iTrader: (1)

After reading this I always thought 1.7 rockers were for overkill for the LT1's. My engine is still on the stand and I haven't put on the rockers yet but I think I'll leave well enough alone even though I have the Patriot Gold Extremes.

My cam specs with the Comp 1.6 Ultra Pro's is 232/240 .595/.595 110 lsa. Just out of curiosity would I have to worrry about hitting the piston if I used 1.7's with this cam?

MattSapp95_T/A

iTrader: (35)

That cam is already pretty big...You would be in the .630 range with a 1.7 rocker...I would def not recommend 1.7s for that....

However it is doubtful that you would have PTV clearance problems...

Matt

Rob94hawk

iTrader: (1)

thanx Matt. Yeah the cam is more than enough. Plus the heads were milled 0.001 and I'm using Mr. Gasket 0.026 head gaskets and everything clears just fine. I'm not going to unbolt the heads now anyway just to use 1.7's on a daily driver.

1961ba427

iTrader: (26)

Yeah, I wouldn't run them with that much cam either. I don't think the returns would add up the same compared to using them on a milder profile.

1961ba427

iTrader: (26)

Any input on those Comp #987's?

MattSapp95_T/A

iTrader: (35)

1.7s would put that cam right at 580....Those springs don't have very mush seat pressure...I would prob email comp and ask them what they recommend.

I know I sound like a broken record but Patriot Extremes are great....

Puck

iTrader: (17)

Be careful running 1.7s on the more aggressive HR grinds. Modern HR cams are hard enough to control at high rpms due to the fast ramp rate, and 1.7s dont just add more lift...they essentially make everything happen faster.

With the wrong cam you can easily end up doing more harm then good...its best to have the cam spec'd for 1.7s and is really only beneficial for crazy good heads that you want very high lift(.700+) without going to huge lobes on a small base circle cam.

kinglt-1

iTrader: (26)

agreed! The ol comp xe230/236 is the limit with running 1.7's. Besides its just a band aid for guys who have this cam or smaller and want to get a little more out of it. Ideally a custom grind w/ 1.6's the way to go!