Hey I just finished up my stroked lt1 383.. I have a xfi292 cam (584 lift, 292 dur.) I had my stock heads ported and a custom valve grind.. Still using stock springs and push rods.. wondering if the shop who did it did them a little to tight or what.. i know your thinking thats to much lift on stock springs but the tested out at over 600 before coil bind, but does the duration matter.. need to get this fixed tonight.. just wondering if anyone had any opinions on what happend?

 

I'll bet it was the belt tensioner, was it put on properly?

 

cant be belt tensioner i have the after market whoopdy doopdy belt tensioner!

 

Stock springs on a big roller cam. I think I know what the problem is. The stock springs fail with a hotcam.

 

1st of all stock PUSHRODS or CONNECTING RODS?

2nd STOCK valve springs? Are you ******* serious?

3rd I would either set fire to it or take it to a qualified shop. Im afraid its doomed with you and your "shop" working on it.

Seriously WTF is wrong with people

 

roflmmfao omg!! Epicness

 

whoopdy doopdy belt tensioner! FTMFW

 

Hopefully you are a troll, but if you aren't you and the shop that put that combo together are complete morons.

 

I was going to upgrade the heads when I got some more cash and just run those for now.. had springs checked out n they diddent coil bind till 630, diddent have the dur. checked because i diddent know that matterd.. the other 13 are doing good lol

 

Intake Duration at 050 inch Lift 242
Exhaust Duration at 050 inch Lift 248

just some more info

 

Yeah they didn't coil bind til .630, but they have totally inadequate pressure to control a big roller cam that aggressively launches the lifter up. Go get some 918 behives, and while you are at it get some chromoly pushrods before you snap the tips off of some of them.

 

I run that cam. That is just about the bigeest off the shelf cam made for an LT1. It doesn't belong on a stock unported head that flows 210cfm.

 

this thread is win!

 

coil bind and spring pressure are 2 different things ,, its not how much lift your cam makes its how much pressure the spring has to be (open) to control the valve ,, .600 lift needs at least 370-380lbs open (n/a) in my opinion...

 

heads are ported

 

k after work im running to summit and grabbing the COMP Cams 26918-16 what a good set of push rods you'd recomend?

 

What kind of rockers? Self aligning or nsa?

 

crand gold self aligning 1.6 rr's

 

You need the appropriate retainers and locks too.

springs:
http://www.summitracing.com/parts/CCA-26918-16/

retainers:
http://www.summitracing.com/parts/CCA-787-16/

you'll need 7 degree locks too, there are many choices

pushrods:
http://www.summitracing.com/parts/TFS-21407300/

 

its hard to say what pushrod length you need ,, if the stock length pushrod worked then use that length in a hardened ,, judging by the way your doin things its probably not gonna be running very long so geometry doesnt really matter...,