if i remember right if a 91 or 92 z28 had t-tops then it only came with the tpi 305 not the 350 tpi .so what about the the 91 92 z28 convertible did it come with both the 305 and 350 or just the 305

 

Just 305, no 350-to much torque

 

Right on man.....Convertibles were only able to have 305's in them.....the 5.7 L98's produced to much torque for the car to handle....and the car would twist.....so..... the 350 L98 only came in Z28 Hardtops only......no t tops or convertibles were available with the 5.7 L98.

 

Very true...350"s note being available in them from the day they left the factory if that was the info needed .

But that doesn't mean there arn't any out there now

 

haha.....you got that right..I saw a 91 Z28 convertible with an LS1 in it.....wish they would have stuffed those in them in the 1st place!

 

yeah thirdgen resource has a ls1 convertible 6 speed!

 

Convertibles and no 350 only applies to Camaros. At least I never seen or heard of any. There are Pontiacs out there like this though.

 

GM just didn't want to spend a few extra bucks to strengthen the 'verts for a 350.

 

right the convert" was what $4,000-$5,000 above the price of a regular Z, what would It cost you the consumer for a 350 convet' back in 91-92? $6000-$7000 above normal price. GM prob didn't think there would be that much of a market for them. (over $30,000 camaro in 92)
biker

 

Yep, I just heard about that the other day.

 

I'm not sure on the figures, but for that year 91 there was only about 40 hp difference between the 305 and the 350.

Iv'e been told that it's not so much the HP but the torque that is the reason they didn't do them with 350's.

 

I can rip stock or mildly modded 350's with my 305 as it is now, I don't see why a 350 was too powerful for a vert..I don't have any flex issues.

 

I've seen 5.7l w/o t tops have stress cracks in the roof just above the doorglass extending from the B pillar. Now if a stock 350 can put cracks in a car with a roof I could imagine what it could do to a convert wthout lower body reinforcement. GM should of put SFC's on the verts, for the extra 200 bux it would of cost them it would of prevented some rattles and gave the car a better feel right from the showroom floor. My car flexes way too much and SFC's are a high priority this year.

 

I have those cracks with the 305! I didnt realized how much my body flexed until I tried putting in control arms. Weak.

 

There are SFC's on the verts.

 

I've been mentioning mine since I came on and once the VIN was 'decoded', it was determined that it was an L98... it has 140 MPH speedo which suggested that from day one. Also have electric windows, lock and trunk release. Auto trans, and ASC door jam stickers. Mine slides under accel. I think this is common enough. They are a lot of fun in that regard (if you know how to drive properly), but for racing, traction is much more paramount.

I also have factory dual cat exhaust. Anyway, this rumour been dispelled enough for me... I'm going to try to restore my car's former glory

BILL

 

Umm not to argue and I'm not sure if anyone mentioned this yet, but I know for a fact my 89 Iroc had Factory T tops with a Factory L98 350. I also beleive the 90 had T's with the L98. Just so you know that's all.

 

1989 was the last year the optional 5.7 TPI L98 engine came in T-Top IROCS. Starting in 1990, (just found out, thought, it was 91) the 5.7s were available only in hardtop. Thanks for the info though man....

 

I have those cracks on my hardtop 2.8L v6, they probably more likely came from popping a curb or something like that forcing the body to flex as well as the engine.

 

^ Agreed.

 

where did you find this proof that in 1990 no 5.7 L98's came w/t-tops? I'd like to check it out. Cuz I saw a 1990 IROCZ that had 5.7tpi and t-tops, but I didnt check the RPO codes, so it could have been modified, who knows.

 

http://members.***.net/iroczdave1/ Go to this Guy......he know's a BUNCH about 3rd generation f-bodies. He's a great guy to deal with and he providied me with the info about it all......write him an email if you want.....