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#1
05-14-2005, 08:10 PM
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What's the difference 305 IROC engine and 305 truck engine?
I have a 1988 Chevy 1/2 pickup with 305 5sp manual. It has over 170,000 miles and getting tired. Instead of rebuilding it, I have a chance to buy a good running 89 Camaro IROC 305 (TBI) engine for $150 (90,000 miles female owned car that lost it's shock tower to rust)
Looking at the parts cost to rebuild, the IROC engine will cost quite a bit more. Probably because the truck engine may be a non-roller engine and the IROC motor is? Is this the major difference...any other differences?? 
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#2
05-15-2005, 08:41 PM
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Re: What's the difference 305 IROC engine and 305 truck engine?
well they should both be hydrolic roller engines, chevy started doing that in 87. the main difference is going to be the cam and i think the heads and intake. the bottom end however should be identical. although the oil pan from the truck engine may have to be swapped to the camaro engine when its installed.
__________________
 Chevrolet Camaro - I enjoy beating the hell out of people   http://www.automotiveforums.com/vbulletin/showthread.php?t=68052
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#3
05-16-2005, 01:13 AM
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Re: What's the difference 305 IROC engine and 305 truck engine?
I agree but I'm pretty sure the truck engines were non roller engines. My S10 motor is from a '90 truck and it's not a roller cam. 4.3's are all roller cams though. I wouldn't be surprised if the heads and intake were the same. I know the heads on 3/4 and 1 ton trucks are different due to valves and seats. For $150 you can't go wrong....
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    '89 S15 4x4 350TBI/700r4restored body, paint, 3" lift, crane cam, vortec heads '88 Iroc 350 carb, TCI 700r4, 380hp
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#4
05-16-2005, 02:03 AM
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if it actually is an IROC engine, it should be a tpi, not tbi... RS's had tbi's...
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 '92 RS lt1/t56, lt4 hot cam, 30lb injectors, 54mm throttle body, full exhaust, 4.11 posi, 4 coil ignition, alluminum driveshaft, adj rear suspension, low. springs, electric water pump, custom tune.
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#5
05-17-2005, 09:14 AM
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Say's IROC-Z
The car has IROC-Z written all over it and the TBI looks like a stock setup.
The VIN is 1G1FP21E5KL177XXX Not a Camaro/Trans Am expert but thought the 1989 IROC had (3) engine options: 305/TPI code F, 350/TPI code 8 and 305/TBI coder E. (Using the 8th VIN digit)
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#6
05-17-2005, 09:34 AM
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305 Tbi Iroc-z
Just checked the following 3rd generation web site..the IROC did have a 305 TBI option in 89
http://www.thirdgen.org/newdesign/tech/techdb.shtml
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#7
05-17-2005, 09:16 PM
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Re: What's the difference 305 IROC engine and 305 truck engine?
yup, some IROCs came with the TBI setup.
__________________
Chevrolet Camaro - I enjoy beating the hell out of people http://www.automotiveforums.com/vbulletin/showthread.php?t=68052
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#8
05-18-2005, 02:01 PM
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Re: Re: What's the difference 305 IROC engine and 305 truck engine?
Quote:
__________________
'92 RS lt1/t56, lt4 hot cam, 30lb injectors, 54mm throttle body, full exhaust, 4.11 posi, 4 coil ignition, alluminum driveshaft, adj rear suspension, low. springs, electric water pump, custom tune.
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#10
05-19-2005, 12:07 AM
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Re: 305 Tbi Iroc-z
Quote:
Wierd....
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 91 RS Camaro V8 305 TBI cold/ram 14"/3" open element K/N filter 3.73's B&M Megashifter 180 thermostat Flowtech TERMINATOR Exhaust 3" exhaust cutout Silvania Silverstar Headlights Ronal R15 Firehawk Wheels Hankook Ventus Sport (front) Sumitomo HTR+ (rear) 275/40ZR 17 all around... _____________________________
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