I've got a 1991 Syclone thats been in storage for 7 years. I put it in storage since I love the truck but have always had reliability problems with it (I once went a whole 2 weeks without something breaking on it). I've been thinking about doing a LS or LQ series motor connected to a newer 4L60e or 4L80e. Anyone have a link to some info the plus/minus of all these motors/trans? I just want the truck to be reliable... I'd be happy in the 400 hp range. The truck was pushing about 400 horse before so I'm not really loosing anything. The original engine is completely disassembled since a blown headgasket o-ring hitting a piston sounds like a light knock. I'm thinking a 4L80e/LQ9 swap. Would I be better with an LS1/2? I don't really know much about these motors except they seem to love to make reliable horsepower. Anyone know anything specific to swaping one into a syclone? I figure the oilpan would be the biggest issue.
I've had some personal things come up and I wasn't able to work on it for a while. I started working on it again earlier this month. The engine/trans is in the car and the rear end is also mounted. I switched to 17x9 wheels for the rear since they fit without any cutting. I'll do the 17x10.5s later... stupid decklit hinges are in the way and I miss driving it. Should be on the road in a few months. I'll post a update here in a few days. The Syclone project is a year or so away... I'm just starting to gather info for it.
Anyone got a link to thread/webpage with a direct comparison between the LS1/LS2/LS7/LQ4/LQ9/L91 engines/heads? I've been searching but haven't really found anything good. I need to learn about these motors. I am thinking maybe a set of new L92 heads on a LQ4 with a decent cam that ought to make 400+ horse easy.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
91 GMC Syclone LSX/LQX Swap Qs?
It's like a ball of yarn unwinding, that has no end... Author DKz Garage
Linear Mode
