4.125" stroke in LQ4/LQ9 block
#1
4.125" stroke in LQ4/LQ9 block
GM lists max stroke for iron LQ4/LQ9 blocks at 4.125". Is anyone using a 4.0+" stroke without issues? What are things to be aware of when using such a big stroke? What are your combinations and what type of hp are you getting from these set-ups? Thanks fellas...
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Homer_Simpson (12-04-2021)
#7
10 Second Club
iTrader: (16)
such a long stroke(4" is about max recomended) in a stock block pulls the piston too low putting the wrist pin centerline(i forget the exact term, guide point?) below the bottem of the sleeve causing lots of stress. broken pistons are a not uncommon occurance. but hey, its cheaper initaly right lol.
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#11
LS1Tech Sponsor
iTrader: (14)
I am not saying it cannot be done or never has, but the design of the piston is the thing i worry about. I know they work and I know for the most part they are popular, but we do not choose to build them as a short block. I can get you the parts all day long, but we will not assemble them as a shortblock.
#13
I would like to fire this up again since I am building a LQ9 425.
Components:
Calies Magnum XL 4.125 crank
Calies 6.125 rods
Wisco custom 4.050 piston
MS4/111 cam
WCCH l92 heads
LS3 intake
How far into the bore of the cylinder can I go or is .050 the safe max? Is there anything I should be cautious of or should relay to my builder, ie- any secret tricks
Components:
Calies Magnum XL 4.125 crank
Calies 6.125 rods
Wisco custom 4.050 piston
MS4/111 cam
WCCH l92 heads
LS3 intake
How far into the bore of the cylinder can I go or is .050 the safe max? Is there anything I should be cautious of or should relay to my builder, ie- any secret tricks
Last edited by 99T/AVert; 03-12-2010 at 02:29 AM.
#15
What would you suggest? I already have the MS4 @ 111 lsa. I think its the best sounding cam that Ive heard, I LOVE the nasty chop lol, also all the great reviews is the reason I got it.
Again what your you suggest? I would want something that sounds like it is trying to hack up a small child after it just got done sucking it in through the intake lol.
#16
11 Second Club
iTrader: (88)
Well it may sound like that with the L92's, but it won't perform it's potential. The L92/LS3 Heads are picky when it comes to a Cam. I have a 114+3 LSA Cam, and at a 800 RPM Idle it sounds pretty sick..
I had Patrick G spec mine..get with him and see if he can help you out.
I had Patrick G spec mine..get with him and see if he can help you out.
#19
doesnt the wiseco pistons compensate for the rings at the bottom of the stroke
ie;wiseco rotating assembly (wiseco website)
seems they may have the oil control and broke pistons in check