ari666
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- Mar 10, 2009
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- Location
- melbourne
- Members Ride
- 1966 impala, R32 GTR
just noticed yet another snapped spring. this one is down by the base and wouldnt have had much effect on vac, so it may have been broekn for a while, i just dont know.
however, this makes the 3rd broken spring from these springs. they were brand new 'from the box' LT1 springs to suit my crane 286 cam (496 lift 230 duration, 112 seperation)
the problem is when i bought them i had stock rockers, i later put yella terra 1.65 adjustables which brings my lift to around .511. i asked dude-face-sales rep (when the first spring broke) why it wouldve snapped and if 511 was too much lift for it to handle.
his response was "well you probably shouldnt be revving it to valve bounce" which is weird cos' i hadnt finished running in the build and had not once ever reved it past 4k rpm...
so i loosened off all my rollers a touch and drove it for a month or so with no further problems, till' one day my vac guage started going off its face and the engine started missing, limp it home, sure enough, broken valve spring.
i rang dude-face-sales rep again and asked "are you SUUUURE 511 is ok with these springs" and his response was pretty much the same as the first time. the thing is i dont rev my engine that high, i have the limiter set on 5500rpm cos thats where my power peaked on the dyno. so saying its my fault is BS
ive been looking around for springs and come across these: CROW #4843 Crow Performance V8 Holden Valve Springs (4843) (eBay item 160569697288 end time 17-Apr-11 08:38:12 AEST) : Cars, Bikes, Boats
in the listing it states they are good for 550 lift with no machining and stock collets/retainers. does anyone know if 511 is too much for LT1's. could there be another reason for them snapping? my driving is not at fault, so forget about "try not revving it to valve bounce" too tight roller rockers? anti pump lifters the cause?
anyone used those crow springs? is it true about 550 lift, or is it just a tall story? i have heard the only way to get 550 without machining is to replace the collets/retainers with .050 recessed bases.
however, this makes the 3rd broken spring from these springs. they were brand new 'from the box' LT1 springs to suit my crane 286 cam (496 lift 230 duration, 112 seperation)
the problem is when i bought them i had stock rockers, i later put yella terra 1.65 adjustables which brings my lift to around .511. i asked dude-face-sales rep (when the first spring broke) why it wouldve snapped and if 511 was too much lift for it to handle.
his response was "well you probably shouldnt be revving it to valve bounce" which is weird cos' i hadnt finished running in the build and had not once ever reved it past 4k rpm...
so i loosened off all my rollers a touch and drove it for a month or so with no further problems, till' one day my vac guage started going off its face and the engine started missing, limp it home, sure enough, broken valve spring.
i rang dude-face-sales rep again and asked "are you SUUUURE 511 is ok with these springs" and his response was pretty much the same as the first time. the thing is i dont rev my engine that high, i have the limiter set on 5500rpm cos thats where my power peaked on the dyno. so saying its my fault is BS
ive been looking around for springs and come across these: CROW #4843 Crow Performance V8 Holden Valve Springs (4843) (eBay item 160569697288 end time 17-Apr-11 08:38:12 AEST) : Cars, Bikes, Boats
in the listing it states they are good for 550 lift with no machining and stock collets/retainers. does anyone know if 511 is too much for LT1's. could there be another reason for them snapping? my driving is not at fault, so forget about "try not revving it to valve bounce" too tight roller rockers? anti pump lifters the cause?
anyone used those crow springs? is it true about 550 lift, or is it just a tall story? i have heard the only way to get 550 without machining is to replace the collets/retainers with .050 recessed bases.