Full 3rd gen Swap

going to swap a 350 into my IROC with a stock 305, and everyone I talked to told me to just get SFC's to strengthen the structural integrity. Aparently, Kenny Brown performance makes some of the best for your car. Good luck.

The Freak

You do not need sub frame connectors. contrary to some peoples beliefs, even a 454 will not twist a 3rd gen in to a pretzel. Charles

Well that's new to, well, pretty much everyone... Even my '90 GTA with a stock 305 TPI saw HUGE benefits from a set of MAC sub fame connectors. The car is far stiffer, and many of the creaks and groans are gone. Thirdgens will twist, especially t-top cars. Cracks in the sail panels are not unheard of.

My friend actually has I think a 1990 350 Formula hard top, and he wished he had put SFC's on it because after he had his car for a couple months, his roof was covered with stress cracks.

The Freak

largest stress crack I have even seen in a F-car is 3/8's of a inch long. That was in a Big Blocked drag car running Slicks, no cage, no sub frame connectors, 12.09 in the 1/4.

So if your pals is all cracked up, he should junk it, cause it's from a wreck and not a stress crack from a 350. Charles

I have drove V8 third gens for years with out sub frame connectors. Basically unless you want to stiffen up the ride, or are making a pure race car you do not need them. You can use them, but they are not required. Charles

Required on a bone stock, pristine body car? No, not required. A good idea, but not required by any means. Throw that 454 in one and that f-body has just become disposeable if you can get it to hook up at all. Ever open the door and slowly drive over a speedbump? Ever hear the creaking and groaning when jacking up only one corner?

To be fair I do not recall hearing of any stress cracks on hardtop cars offhand, but on t-top cars with modded powerplants? Oh yeah. The number one recommended upgrade is always SFCs. Well, that and a good alarm. ;)

I am just worried about the whole 350/t-top/5-speeed combo.... plus the Camaro had been ditched once that DID twist the body enough to shatter the t-tops... so I think the 200 buckss or so would be a good investment. But thanks for all the replies!

-Geno