time to dive in; help with details?

Old 07-11-14, 01:28 PM
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time to dive in; help with details?

so my 20b fc is a great car but in a competitive world, its hard to keep it running and when it breaks, its expensive and time consuming to fix.

im going v8 to hopefully alleviate those issues but i am not sure about the engines. do all chevy 350 engine parts bolt to all chevy v8s? ecu? manifold? heads? i have a steep learning curve

here is my plan:

gm LM4 5.3. same as the 2003+ tahoe but in aluminum
muncie m20 4speed. should be stronk right?

after that.. im lost

will the trans just straight bolt to the engine? do i have to worry about clutch offset stuff?

if i run the truck stuff, is my performance going to suffer? i want power but new heads and intake and cam are relatively big ticket items when the engine itself is only 500$

can i run the stock ecu and harness or is it typically ran with stand alone of some sort?

been spending hours searching but i dont know what i dont know so i dont know what to search for and there is so much out there, im quickly becoming overwhelmed.

~400hp should be plenty and i know the muncie will limit my top speed to around 120. which is perfectly in range for what i ido.

thanks for any help. sorry for being a noob
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Old 07-11-14, 02:34 PM
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Join Norotors.com, All your questions have been answered there.

Everyone there is going to tell you this-

Scrap the Muncie and go t56 6 speed

You will NEED Camaro/Firebird (F body) or corvette accessories and brackets, and a Fbody oil pan. The truck intake, accessories and oi lpan will not work for a RX7 swap.

You can run almost any OEM ECM and harness that is compatible with your engine (Truck harness and ECM for instance) but the F Body harness and ECM is more popular, and the harness is a better length for the swap. If you mix and match parts there could be a connector different here or there, easy stuff to fix.

You can make the aluminium 5.3 work, all that stuff will bolt on, but unless you scour for deals or get a great deal on the engine, it is not much cheaper than just buying a 5.7 LS1 pullout with all the correct stuff already on it. You are at $500 for your current LM4, expect $1600 for the T56 trans, (and you may need a flywheel and clutch on top of that) $150 for the F Body oil pan, $200 for LS1 intake/fuel rail and injectors, $500-$700 for brackets and new accessories.. You'll be hovering just over $3000. If you need a ECM, Harness, flywheel, and clutch expect another $500+ for all that stuff. Again, If you are patient, you can find used parts, or deals on parts to save some money.

You can find LS1 pullouts with T56 transmissions for $4000 and they will make more power. You may be better served looking for deals like this.

If you do stick with the aluminium 5.3, the L33 version is the best, but that will be closer to $900 for the engine. It has the 243 heads (best OEM cathedral port heads worth $350 by themselves) and flat top pistons.

The t56 trans and bellhousing will bolt to any Gen4 or 5 engine, you just need to have the matching starter to your bellhousing (Fbody or GTO)

If I were you I'd buy this.. It will save you cash in the long run. It is an LS1/T56 combo $4K for everything you need including trans, clutch, harness, ECM, and its flashed to delete the emissions stuff and ready to drop in and go.


Beyond this all you need is driveshaft, mount kit (go with Ronin Speedworks for this) exhaust setup, radiator/fan setup, clutch hydraulics, wiring work, fuel system work, various nickle and dime fittings.. and time. You could wrap the swap up nicely for another $2k, or invest more for added performance.

Good luck. You will love it.
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Old 07-11-14, 10:06 PM
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I will concur with LargeOrangeFont said.

I went the 6.0 LQ4 route and it cost me nearly as much to get all the car stuff onto the truck engine as it would have been to just have started out with a Camaro pullout. Go that route and save yourself a lot of extra work. May seem steep to drop $4,000 right away, but all the odds and ends really add up a lot when starting with what seems to be a cheap $500 engine.
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