I have a '89 Iroc-Z,G92(dual cats, 3.45posi,cooling lines,5spd305tpi,) I was wondering what the difference is between 89 G92 305's and earlier and later ones. IT says it makes 230hp at 4600rpm 300ft/lbs at 3200. Other years w/ 3.45 &3.42 is at 4400rpm. Does it allow for higher revs. It also redlines higher than other Iroc's I've seen. Is this the best combo ever offered in the IRoc years? I think it is. No slushbox for me please. ------------------

There's nothing special about the 3.45 gear 305 5-speed other than the L98 cam and the dual cats. All 89-92 G92 cars got this. The 3.45 ratio rear end is a 9-bolt, which is a little bit stronger than the regular 3.42 ratio 10-bolt they put in the later thirdgens.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

Why does it redline at 4600 not 4400 like the rest of the years? Just curious.

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1989 Iroc-Z. 305TPI 5spd, G92 (230hp/300ft/lbs). 91-92Z28 groundeffects. Corvette Admiral Blue Metallic paint. Thermomaster chip, 160*stat & fan switch, Bosch +4 plugs, MAF screens removed, custom ram air, Flowmaster cat back, K&N, adj. fuel pres. reg.
72,000 miles. SWEET!!

Don't confuse redline with peak hp.
Your redline is 5500rpm, just like the 350
and other 305/5spds.

However, the dual cat 305/5spd was rated at
a peak hp of 230 @ 4600 rpm as opposed to
4400rpm on the 350/305 5spds.

This is attributed to the dual cats, I would guess. The 3.45 has nothing to with the peak
rpm at which it occurs.

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88 IROC the best RS ever made!
well except for the B4C

[This message has been edited by 871LEIroc (edited November 10, 2000).]