ZZ4 engine swap...........
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Junior Member
Joined: Aug 2001
Posts: 73
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From: Stevensville, Maryland
Car: 88 Iroc
Engine: 350 TPI
Transmission: 700R4
ZZ4 engine swap...........
hey guys,
I'm the usual guy trying to swap out my wimpy 305 and wanting more horsepower to whip some mustang rear. well i have an 88 iroc z 305 tpi auto and i was wondering with the ZZ4 engine, what other stuff can i do to get my car into very low 13/s like gears, tranny rebuild and shift kit, higher stall converter, ...... Well if u guys could help me out, im really new to this stuff and i want to get my car up and going fast. well thanx alot for your help.
mods: thermomaster chip, SLP airfoil, catco hi flow cat, 80 series flowmaster catback... hopefully ZZ4 swap soon...
I'm the usual guy trying to swap out my wimpy 305 and wanting more horsepower to whip some mustang rear. well i have an 88 iroc z 305 tpi auto and i was wondering with the ZZ4 engine, what other stuff can i do to get my car into very low 13/s like gears, tranny rebuild and shift kit, higher stall converter, ...... Well if u guys could help me out, im really new to this stuff and i want to get my car up and going fast. well thanx alot for your help.
mods: thermomaster chip, SLP airfoil, catco hi flow cat, 80 series flowmaster catback... hopefully ZZ4 swap soon...
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The ZZ4 is a nice engine, and it'll get you into the 13's if done properly, but it won't be cheap with TPI.
You'll need a better base, like Bigmouth, that's a Vette-style so you can get your EGR to work (the aluminum heads don't have the exhaust cross over passage that currently feeds your EGR valve). And, you'll need shorter fatter runners, a ported plenum, larger TB and injectors, and AFPR. Custom or DIY burned PROM, you'll have the power for the 13's. Low 13's, probably need ZZ9 or LT4 Hot Cam and 1.6:1 rockers.
Add headers (go SLP 1-3/4", as you've obviously got the bucks to get the best), high-flow dual cats, and cat back. To handle this power and get it to launch, sub-frame connectors, boxed or tubular lower control arms & LCA relocation kit, and poly bushings. 4.10 gears, posi if not already, sticky drag radials. For all the tranny questions, just talk to Dana at Pro Built.
A buddy here did all those things except headers, and stall is only 2000. In addition, he did extrude hone on the intake track, CNC head porting, zero-decking. As is, he runs 14.4's here (mid-13's corrected). Some day he'll get the headers on. Oh, he passes emissions easily.
Happy hunting!
You'll need a better base, like Bigmouth, that's a Vette-style so you can get your EGR to work (the aluminum heads don't have the exhaust cross over passage that currently feeds your EGR valve). And, you'll need shorter fatter runners, a ported plenum, larger TB and injectors, and AFPR. Custom or DIY burned PROM, you'll have the power for the 13's. Low 13's, probably need ZZ9 or LT4 Hot Cam and 1.6:1 rockers.
Add headers (go SLP 1-3/4", as you've obviously got the bucks to get the best), high-flow dual cats, and cat back. To handle this power and get it to launch, sub-frame connectors, boxed or tubular lower control arms & LCA relocation kit, and poly bushings. 4.10 gears, posi if not already, sticky drag radials. For all the tranny questions, just talk to Dana at Pro Built.
A buddy here did all those things except headers, and stall is only 2000. In addition, he did extrude hone on the intake track, CNC head porting, zero-decking. As is, he runs 14.4's here (mid-13's corrected). Some day he'll get the headers on. Oh, he passes emissions easily.
Happy hunting!
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Joined: Feb 2002
Posts: 1,141
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From: Nashville TN
Car: 1989 Trans Am
Engine: 355 HSR
Transmission: Pro-Built 700r4 w/ 3400 converter
Axle/Gears: 10 bolt w/ 3.42 gears
hey man.... i am looking into the same swap. i have talked to some people and this is what they have told me with get me to the low 13/ high 12 range...
1. zz4 engine + i am adding the LT4 hotcam for added performance
2. get rid of the stock tpi intake... changing the runners and all will help but the best bet is to get something like the TPiS miniram, the holley stealth ram, or the LT1 intake that John Millican prepares.
3. 1 3/4'' headers w/ a catback exhaust.... im gonna do the exhaust but also add a cutout for added flow... and with the cutout you can uncap it when u want...
4. you will have to rebuilt the tranny... if not you will rip it to shreds... you should also put a torque converter in at the same time...
5. a 3.42 gear should suffice... you can go with a 3.73 if you want
6. 24# injectors
that is what the people told me for low 12's... and what my plans are for now..... suspension stuff to come later i hope
1. zz4 engine + i am adding the LT4 hotcam for added performance
2. get rid of the stock tpi intake... changing the runners and all will help but the best bet is to get something like the TPiS miniram, the holley stealth ram, or the LT1 intake that John Millican prepares.
3. 1 3/4'' headers w/ a catback exhaust.... im gonna do the exhaust but also add a cutout for added flow... and with the cutout you can uncap it when u want...
4. you will have to rebuilt the tranny... if not you will rip it to shreds... you should also put a torque converter in at the same time...
5. a 3.42 gear should suffice... you can go with a 3.73 if you want
6. 24# injectors
that is what the people told me for low 12's... and what my plans are for now..... suspension stuff to come later i hope
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