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Old 11-05-2007, 08:59 PM   #11
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then the Rollmaster Timing chain set so i dont have to worry about that breaking.
go on the there a rollmaster timing chain that broke and he not the only one
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Old 11-05-2007, 09:28 PM   #12
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Originally Posted by slickbonny
Originally Posted by 1SSEi4U2NV
Those valve springs are way too much for your application and will cause your timing chain to strech and eventually snap and break your dampner. (unless your going for an all out setup (double roller, Stage 4, XPZ, etc... ). They say they will support lift up to .650" but you will not make any power at those lift values. IIRC stock heads dont make any more power over low .5xx" lift. SI valves have been known to fail with spring rates over 105 lbs., non-intercooled M90 setups, and turbo setups. This combo on these heads are going to fail eventually with any setup!

The amount of money it will get you to be able to run those safely its not worth it. I can't even believe that W-body sold those as a whole unit... that is so much negligence on there part. Personally I'd try to return tose and get your money back.
that is wut i planned on doing. and they have clearance up to .650 but the lift wont pass .625 with 1.9'* and a stage 1 cam. and i'd be gettin the double roller chain with a nice port and polish and that is some cheap performance heads. but i did decide to prolly return them and just save up for that Whipple. im done with mods till prolly christmas.
Even though you can support the lift of a stage 1 cam and 1.9'* doesn't mean you can run them with success. With a Stage 1 and 1.9'* your valvetrain geometry will be horable and you will destroy your valve guides in your heads. Sell the 1.9'*, return those heads and buy a XP or 1x cam and run your stock heads and you will be faster. If your talkin about the $$ you want to spend go turbo or nothing.
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Old 11-05-2007, 09:55 PM   #13
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The 1.9'* may be a little too aggressive with an S1X cam. You may want to move down to a 1.8 or 1.7 ratio.

Why do all the engines blow on the dyno.
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Old 11-06-2007, 12:20 AM   #14
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I agree 1.9s with the S1X will be very agressive, if the heads aren't ported you won't be able to flow enough to warrent the the 1.9s with the S1X anyway.

Originally Posted by 2000SilverBullet
Why do all the engines blow on the dyno.
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