Topic: LS engine swap almost completed!
in Forum: C3 Engines
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Awesome job! Looks great. Are you going to have it dyno'd? Did you sell the ZZ4?
I've been thinking about a 5.3 or even 6.0 LS for my '91 Suburban but I'm probably going to just build one of the TBI 350s I have into a vortec 383. I'm always up for a challenge but maybe not THAT much of a challenge
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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Lifetime MemberEquinunk, PA - USA
Joined: 10/31/2007
Posts: 2465
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
10-4 on the throttle sticking! Is the rev limiter hooked up? It gets up there WAY to quick. Can't shift it quick enough.
I finally have a break from the snow to hang out for awhile.
Dave, I will have it on the dyno this spring. We ran out of time this past fall to get the final tuning done. I did sell the old crate engine. Got $1700 for it. It now lives in a '68 Biscayne wagon. Doing a LS swap into a "Square body" GM truck is much simpler. I would do it if I were you. 
Mark, we set the rev limiter to 6500 rpm's. It's amazing how quick it revs. This actually created a problem with shifting the Tremec TKO 5 spd. TKO500's don't like high rpm's. Knowing what I know now, I would have used a T56 or Tremec 6060 6 speed instead. I had to yank the TKO out and have carbon fiber syncro's and brass shift fork pads installed to help with the high rpm shifts.
TKO's are a hodgepodge of truck and car parts I guess. Joel would know more about these than me.
Cindy, now's the time to do it with the body off. It is a big undertaking but not impossible. Time, patience and research is the key. It will cost you around $6k to do. The other alternative to modernizing your car is to go with a throttle body injection unit from FAST, Edelbrock, MSD, or one of the other companies. These bolt right in place of the carburetor and most have a self learning computer so they tune themselves. It about half the cost. Right around $3k to do. Much more reliable and responsive than a carb.
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
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Lifetime Member #26
Hi! Can you share some information on your LS Swap? I am curious as to what fittings are needed to link the fuel system pressure and return lines to the LS engine fuel system. I would also like to know if you used the existing fuel pump relay for the in tank fuel pump. I know I'll need to replace the cfi pump to a larger, high pressure pump. also, which headers/exhaust manifolds are you using? any info would be greatly appreciated!
Thanks!
Ben Smith
Sarge,
Great job with the transplant and tweaking. If it sounds as good as you say, we are all envious.
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in Forum: C3 Engines
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