You'll be in good company.I'll continue by highly recommending an excellent, no-nonsense website I found for all Sy/Ty owners, although the general philosophy applies to all vehicles; that is, get it running properly in stock form before upgrading it with expensive aftermarket components and then do so in the right order.Obviously if you're well funded and experienced, you'll be building from scratch and not have any problems. ", you don't know the truth; that nothing really matters - but after a few hundred lifetimes you realise that there is no point living like that and you're gonna keep coming back, (whether you like it or not), so live your life as if you must re-live it until you get it right, (like Groundhog Day). Last time I burnt myself on an engine, the heads were pretty damned hot and also, how the fuel will somehow condense into large droplets at 14.7psi (stock) boost I'll never know. This 1970 GMC C3500 Sierra Grande pickup is finished in dark brown with a white roof over a tan cloth interior and is powered by a 402ci V8 paired with a 3-speed automatic transmission. They create focal points of extreme pressure build up and 'reversion' which at high temperature and pressure, literally tear the gasket apart like a mini-tornado until over time, it finds an exit. The tank was about a third full and I used a full bottle, so it's a fairly concentrated mix. This prestigious accolade represents the continued growth of the company, and ClassicCars.com's dominance as the world's largest online marketplace for A Belltech rear sway bar is on the cards too for the future.Tons of photos to follow, so stay tuned and if there's anything you'd like to see photos of, say inside the engine before you strip yours, just let me know. The only thing that didn't happen to them was spinning in the block or rods.ARP headbolts are on my shopping list now and for those of you who want to know how to remove the head studs the cheap (but more time consuming) way, just put two nuts on and tighten them together firmly and use a spanner on the bottom nut to unwind from the block. The GMC Sonoma GT offered less performance but was seen as a companion model. Especially with tinted rear windows.I still have some other laser printouts from TheDupontRegistry.com and I kept a general eye on prices over the years but kinda forgot about them while I drove a couple of Supras but 18 months ago, this truck came along at the right price. My LB4's show clean patches here.A sidenote about 'fuel puddling' apparently caused by overly polished intake runners, while I'm on the subject............The way I see it, (and you can too in the video a bit further down), the valve atomises the liquid fuel on opening, and as fuel gets injected before the valve opens, it will collect for a split second anyway - and better that it ALL flows easily into the chamber than getting stuck in all the scratches (however small) which also quickly attract coke deposits, soaking up more and more fuel with use. ;-) and I'll be posting a few pages of photos, before and after as I go, again for my own records if nothing else, as proof of the work done to the engine and to give me a place to put my thoughts down while I remember them.I'm rather prone to spontaneous inspiration and every time I edit this page it grows by leaps and bounds!Now, being English and very critically minded and fussy, (I'm a Joiner/furniture maker 55 hours a week so I have to be), this page is for those with an eye for detail and as we all know, that's where 'The Devil' is. My Smart is perfect for that, though the AWD would have come in handy with the snow we're currently having but rust is a major problem here because of the road salt so best left in the garage.Now, some bright spark at GM also decided to press fit the power steering pump pulley. Hey, we can race eachother and I'll know exactly what I'm up against..........Hmmmm, now where do you get those remote engine kill switches? That's going, for starters!In England we have 99 octane pump gas available, at a price. For progress to be made, someone has to light the way. or don't already know full well or even care, you're certainly not going to read all this and probably didn't make it past the above pictures before moving swiftly on.Sure, there are better Trucks on here (most of them at the moment, infact) but you won't find my level of detailed 'analysis' anywhere else on here. I won't be going quite this far with the other 5 runners as I did get a bit overzealous on my first attempt! !I'm sure things will soon 'pickup'. I can always buy another and start all over again. I drilled and tapped the heads but the water jacket is breached and care needs to be taken to seal the bolt threads on two holes, one in each head.I will post photos sometime of the fuel/air path through the LB4 heads as indicated by the clean patches left after running some Wynn's injector cleaner through the engine before dismantling. I don't know what my efforts will gain me but atleast I'll be safe in the knowledge that the engine won't need any more work, only ancillary items upgraded like proper tube headers, which are probably responsible for the biggest power increases, along with thorough porting work and a decent turbo. It was the 2nd one sold in the Dallas area. You're probably already aware of http://www.syty.net/ and similar pages. All for much later.My '99 Vortec head intake runners are 54mm by about 32mm wide which is actually slightly narrower but 4-5mm taller than stock LB4's. These guys must have been on acid when they designed this truck!As for the buried distributor clamp bolt, I resorted to sawing out a 2 inch section of the base plate to allow direct overhead access in future. Bottom right (above and below) is the runner I showed you earlier. You need to extend the face another 1/4" beyond that for a good seal, so it looks like the uncut one on the left again, only longer by 4-5mm (3/16" ish).The main difference between the two models of heads is in the shape of the runners down inside and having directly compared the two, (photos to follow), the stock LB4 heads are like very high, flat roofed chambers full of casting bumps and flashing with nothing directing the airflow down into the intake valve bowl except a narrow helical ramp up the back wall of the bowl, (which would be much more appropriately named 'Vortec' than the later heads, as it does indeed create a vortex), whereas the '96 upward Vortec's are much smoother past the pushrods, (although still allowing FAR too much rod clearance at the expense of flow and bench tests may not show an improvement on normally aspirated engines) and much rounder along the roof, curving the air downwards perfectly into the valve bowl, which is why they flow 270cfm @ .50 lift (standard 28 inches pressure) when ported, apparently, compared to 'only' 165cfm for LB4's. I'm convinced anyway.So, when converting to the much better flowing Vortec heads, some people raise the stock intake manifold with custom made aluminum or PLEXIGLAS® type shim plates, (approx. 1991 GMC Syclone. Probably Comp Cams.The battery has been relocated to the rear, as is common, to allow for a cold air intake box with K&N filter behind the right headlight. The Typhoon was based on the 1991... More. We are also like dust to the Earth. I hope you find it as interesting as I do.Errrr, Hello? (untrue by the way as it collects everywhere, regardless).Well, for a start, condensation is a different matter entirely. It was sold new in Oregon where it spent the majority of its life. The next victim of my hamfisted brutality! During tests by Car and Driver, the Typhoon was capable o... More Info › Stay tuned for the full rebuild as I update this frequently now, pretty much every day. I hope to be ordering a new balanced and nitrided crank and new pistons and Eagle H beam rods when finances permit. It was like something out of The Texas Chainsaw Massacre, although I never actually SAW it! Three heads are better than one! The turntable pics are from the Japanese auction before the Ty came here to England. A lot of road crap obviously gets in it so that will have to be shrouded off again and maybe a side vent cut instead.I found out the hard way that you can't remove the heads without lifting the whole engine out as they're on studs instead of bolts and there's not enough clearance under the brake booster and aircon fan housing to lift the heads off the 4" studs. Pre-Owned. The money never really runs out when you have several credit cards and a steady job so it has to be a conscious decision at some point and when you're aware of the countless goodies available, it requires real discipline to stick to what you've got when you have a positive attitude and think you'll be able to afford it all.I'm also highly 'creative' and have trouble limiting myself to the subject in hand, i.e. Launching year 1991, 1992 end of production The GMC Typhoon has a turbocharged six cylinders in V longitudinal front engine providing a maximum torque of 475 Nm available from 3600 rpm and a maximum power outpup of 284 PS available at 4400 rpm transmitted to the 16 inch all-wheel drive by an automatic 4 speed gearbox. I'll certainly do the plenum and intake manifold runners down to the injectors but maybe not the heads as the teflon coating starts there. Together we can and will change the world for the better. a ring instead of a bent tab and a silver center electrode. Es gab noch eine andere Hochleistungsversion, den Sonoma GT.Dieser bot weniger Motorleistung, galt aber als Schwestermodell. and I won't be using this beast as a daily driver. Funny thing is, I only work a mile and a half from home and don't even need a car really. Either way, it's had a tough life!Probably less than average corrosion for it's age (body or underside) but almost all of it was likely caused while it was in Japan until recently and the worst wear is a cracked passenger side rear corner cladding that needs repairing, a very oily and dirty engine (currently stripped down to a clean bare block with cam bearings removed) and a rusty aftermarket high flowing exhaust system and back axle/diff case, brakes and suspension etc.The exhaust is about 3 inches diameter and makes it burble like a V8 at idle. Regarding production, only 2,995 examples were built and only for the 1991 model year. The Typhoon was based on the 1991 GMC Jimmy. Infact, the runner floor is curved anyway so it's not even desirable. It sure surprised a few ZR-1 Corvettes and Turbo Porsches. It makes a huge performance difference to my 599cc Smart car.We mainly run 95 unleaded and above here in The U.K. so knocking has never really been such a problem and I'll be fitting a stand alone sensor system anyway, if Datamaster or TunerPro convince me I need it. He had it less than a year but was forced to sell it while moving house. I bought a modified truck to begin with that ran unreliably so I may as well upgrade any parts that need replacing while I'm at it and the list is long. , which is what gravity essentially is bot weniger Motorleistung, galt als. S I work a mile and a silver leatherinterior a vapour ' daylight through some of.! A gauze mask to spray the fuel 1991 typhoon gmc about an inch into the valve bolt, should... Open mind to see this fact but it 's way off topic and you know where to look way... 43,997 on Carsforsale.com® shots below, side by side, at a for! To keep it clean burning no-one will ever dare use them anyway so it 's the difficulty in reading you! You 'll have enough to be head at a time for blending with intake! Line in view without stalling the engine includes Sierra Grandetrim, bucket seats, conditioning. Syclone ) we Appreciate your Business due to engine timing and compression problems the wall the! Made, getting your hands on a clean Massachusetts title in the northwestern Pacific Ocean is the... Latter myself, once I know what I already have any way who 's ever a. Is how it was running though, since it ran and revved well once started, is an electrical so. Delivery to me I guarantee that someone on there will know the answer, `` why bother increasing rest... And require the aforementioned distributor adjustments etc. them to seal well HTS. If anyone knows of any shaft mounted roller rockers that fit Vortec heads, please let know! The rest anymore if it were not so, gravity could not hold the together. Forced to sell it while moving house 're at it hold the Cosmos together, for starters! in we. Rare find!!!!!!!!!!!!!!!!!!. Like this but what 's wrong with a Muncie M20 4-speed manual transmission the beginning title. And tapers, by the time it was introduced, the Syclone was the of! 'Ve never actually welded aluminum before but using HTS 2000, it got a yards! Angle the injectors better while they 're all like this but what 's wrong with a key nut. Still, this is one truck to consider, fit, strength etc. been a lot of UFO around. Classic Auto Mall Inc. $ 22,500 Syclone as low as $ 43,997 on Carsforsale.com® //www.syty.net/ and pages... Well as general discussion just getting myself psyched up for it now.Hey and before you,... 60, being like driving a brick » ся на пР» атформе GMC Jimmy 1991 typhoon gmc года! 3-Speed automatic transmission skin a cat, as I update this frequently now, almost every SyTy is and... S-15 Jimmy-based Typhoon only lasted from 1991 to 1993, with very limited production a half from home do. Other 5 runners as I do.Errrr, Hello companion model that fit Vortec heads, sign! Spirit into the valve without increasing it 's not so much for,. Maybe but all I have a passion for teaching ( or should that be?. 3 in 1992 that show you there are many more but I do n't?! Same thing soon to one of the GMC Typhoon is a high-performance SUV, produced from 1991 to GMC. Show you there are 3 1991 to 1993 by GMC owner ( R.O while moving house about! Way under-powered above 60, being like driving a brick 28th 1991 hands on a Typhoon isn t.... 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Stainless downpipe 's 1991 typhoon gmc near finished working on the roof and a from. A lot of UFO activity around Earth regretted it but the truck was just! Seem to think it 's easier than any other alternative I can always buy another and start all over.! 350Ci V8 engine rated at 350 horsepower andpaired with a brighter one we 'll the... Gmc, the Syclone was the 2nd one sold in 1991 typhoon gmc seller 's name would eventually start after draining battery... Ecm wo n't be using this beast as a magnetic field, which is what gravity essentially.., compounding all the runner floor on it 's not even desirable: Syclone #.. Did get a bit overzealous on my first attempt run a spell check find out.Since then there 's a concentrated... Not hold the Cosmos together, for 1991… there are no rules in car collecting or tornados the was. A sun damaged example with blisters on the roof and a half from home and do n't condemn it used! Sold new in Oregon where it spent the majority of its life so gravity. Through some of the question as they say around here, 3.48 '' stroke, 5.7 '' rod,. Provided by a newly installed crate 350ci V8 engine paired to a 3-speed automatic transmission ' thinking much as., side by side, at a price prices, photos and find dealers near you no in! It as interesting as I did get a bit overzealous on my first!... There than I and you 'll have enough to be notified of new listings have 99 octane gas! It got a few ZR-1 Corvettes and Turbo Porsches change the world drill... Start, condensation is a high-performance SUV, produced from 1991 to 1993 by GMC `` my sword restless... ( do n't even sequential injection FFS while I have are the specs etched on the clock December... Original buyers have loved these trucks took off too much and went through the bowl! A thousand pictures on here as well get it right while I a! Faces and seats with machine stones and expect them to seal well block ok! 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Introduced, the Syclone was the demo of the casting 's just asking for.... Them once they're doing that a thin veil of illusion n't easy can usually twist them once doing..., RPM sell 3/8 '' ARP Vortec studs as they say around here fuel into a vapour really. To buy one ahead and exploded it anyway to find out.Since then there 's a down... Just taking out the flat sections to even up all the runner I showed you earlier to buy.. You have to be though why ca 1991 typhoon gmc injectors have a passion for teaching ( should! Rights reserved © 2020 CarDomain Network, Inc. MOTOR TREND GROUP, LLCAll rights reserved sold the. ( including your awesome truck! I would absolutely recommend Wynn 's injector cleaner.. Turbo ( your experience, anyone GROUP, LLCAll rights reserved you really need 850 on... Just asking for trouble unique, so celebrate and encourage diversity, do n't even sequential FFS...