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Old 06-01-2005   #1
CavanGTA
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Join Date: Jun 2005
Posts: 7


recomended engine replacement..

Being silly 2 years ago I damaged my engine (87 5.7 all stock). I noticed it wasn't pulling like normal and when I returned to sane speed, a noticeable and sickening knock was clearly heard. I was looking to replace the engine with a ZZ4 crate engine. I definitely want some more power to wipe the smile off of Mustang owners faces. Does anyone have any suggestions as to what I should replace this engine with? Or just rebuild? Will the stock pollution controls and TPI go on to the ZZ4?
I have had the car since 89 and loved it however, it was not practical to do the engine work until now (aka no $$$$).
PS, I need the pollution controls to get the licence sticker renewed (Emission testing in Ontario Canada).
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Old 06-03-2005   #2
Fred91GTA
"Firehawk" GTA owner
 
Join Date: Oct 2001
Location: Brooklyn, NYC
Posts: 1,656


Re: recomended engine replacement..

ZZ4's a good choice. Scoggin Dickey www.sdpc2000.com also has a nice replacement motor with Vortec heads, and comes with the Vortec specific TPI manifold for sale that is also very good. I think somebody on here swapped out the motor in his GTA for that one. Both make over 350HP, so you really can't go wrong. Smog stuff will work. You may be better off going with the Vortec TPI motor though. Either way, you'll need to have a new computer chip burned to get the new calibration locked in for the new motor. If you don't the motor won't make as much power as it can and you may not pass smog. Good luck.
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Old 06-03-2005   #3
MunsonGTA
Bad luck or no luck
 
Join Date: Jun 2004
Location: Ravenna, OH
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GTA Year: 1987
GTA Engine: Custom
Re: recomended engine replacement..

is the block damaged? any idea on how much money you want to spend? any idea on a goal for hp or a time you're looking to run at the track?
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87 GTA: Forged 408 LSX short block, TEA stage 2 cnc ported 243 heads, BTR Stage 3 stroker cam, Fast 102 intake, NW 102 TB, Longtube headers, custom 411 ECM, custom harness, custom tuned, Performabuilt stage 2 4l60E with PTC 2800 stall, 9 bolt rear with 3.70 gears and TAP girdle.

11.16 at 123 mph.
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Old 06-04-2005   #4
FearThisGTA
"The only thing to fear is.............fear itself"
 
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Posts: 4,742



GTA Year: 1991
GTA Engine: 350 TPI Automatic
Re: recomended engine replacement..

Depending on your budget, you could opt to go with a stroker. It cost the same to build them, as it does a regular build up. GM, offers a 383 crate motor as well, of you can pull yours and have it stroked instead. IMO, I would have mine done, IF I had the $$$$. It just depends on your budget, and what it will allow. Iwould almost think you can stroke yours for about the same as a crate motor, if you shop.
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1991 GTA Trans Am
w/305,231 miles
on the original motor!!!!
Time of Death on motor, 4:07pm on 05/29/2010.
Hp:211.2@4200rpms/Tq.328.5@2700rpms
Best et: 13.959@97.05mph
Best mph: 98.3
Best 60' : 1.875 on BFG Comp TA's w/ 32 lbs of air in them
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Old 06-05-2005   #5
CavanGTA
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Re: recomended engine replacement..

Thanks very much for the replies. The engine still runs and to my knowledge, there is no block damage. I was still able to get 120 mph out of it when I noticed that I had a big problem. Since then it was driven easily half a dozen times including to move it to our new house 2 years ago.
I want 350 hp out of it to make it worth while. Here in Ontario I can get a ZZ4 for $5400 Canadian from the local GM dealer. I am not sure about the taxes and or duties that I would have to pay to import an engine.
Will the L98 hold up fine with 350 hp for the long run? I am talking summer driving, daily and only the occasional "carbon removing" exercises.
The ideas are great, thanks again. I'll take all of the input I can get.
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Old 06-06-2005   #6
The Anvil
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Join Date: Nov 2002
Location: Vancouver, BC
Posts: 159


Re: recomended engine replacement..

Ontario is very strict on emmissions testing. You need to pass the visual as well as tailpipe as I understand it. We have emmissions testing here also, but they stopped the visual years ago. Nowadays they are only concerned as to what comes out the tailpipe.

First of all, the ZZ4 is not emmissions legal. It comes with aluminum heads and no provision for an EGR valve. Without one, you'll fail the visual and the NoX part of the testing.

ZZ4 has angle- plug Corvette heads - which may not work with your stock exhaust manifolds.

Those heads have a .100" higher exhaust port than your stock heads - there may be a mis-alignment issue if you use your stock exhaust manifolds.

You would also lose a lot of the ZZ4's rated power by using your stock TPI induction system. Therefore a switch to a StealthRam or other short runner intake would be better suited to it, or, buy the Edelbrock base intake and some larger runners at the least. All of this will add to the cost of the swap and we still have not addressed the emmissions issue.

I would suggest you simply rebuild your stock engine and install the ZZ4 cam, which is actually a pretty good grind for the TPI application. Put a 3-angle grind on your stock heads, and maybe a little bowl work, and bolt it all back together. No incompatibility issues and the best part is you won't fail the visual inspection. A custom chip will round it out and get the most from the combo.
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Old 06-06-2005   #7
CavanGTA
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Re: recomended engine replacement..

The real kicker is, I won't need another emmisions test after 2006.....but I can't wait. Emmissions testing is no longer required after the vehicle passes the 19th year of age. (hence 20 years and over need no test).
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Old 06-08-2005   #8
MunsonGTA
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Join Date: Jun 2004
Location: Ravenna, OH
Posts: 1,947



GTA Year: 1987
GTA Engine: Custom
Re: recomended engine replacement..

i say rebuild your stock engine with a stock rebuild until you can go the no emissions route; or rebuild it with something like a 383 stroker kit and top it with the stock setup so you still have emissions. I'd go the 383 and emissions legal way, then once you don't have emissions anymore you can uncork it and let it rip.
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87 GTA: Forged 408 LSX short block, TEA stage 2 cnc ported 243 heads, BTR Stage 3 stroker cam, Fast 102 intake, NW 102 TB, Longtube headers, custom 411 ECM, custom harness, custom tuned, Performabuilt stage 2 4l60E with PTC 2800 stall, 9 bolt rear with 3.70 gears and TAP girdle.

11.16 at 123 mph.
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