will a chevy big block fit in to a 68 or 69 GTO??
468ci

thanks

Yes the gto is just like a chevelle

Yes AND no. The GTO is NOT "just like" the Chevelle, but does share many of the components. To put the Chevy in there (why in the world would you ruin a perfectly good GTO?) the wiring harness must be replaced or modified, as all the electrical underhood stuff is on the wrong side on the Chevy(starter mainly, alternator, etc.). The engine mounts are different, requiring the Chevy pads. The transmission bellhousing is also different, requiring a change of tranny or an adapter. The front springs must also be replaced, as the BBC weighs about 200 lbs. more than the Pontiac V8.

The end result will be a very expensive car that may or may not outrun the Pontiac in a straight line, but will not handle anywhere near as good as it used to. The BBC creates so much nose weight, the car's geometry is no longer correct. Be absolutely certain to install disc brakes up front if not already equipped.

Be sure you understand this: Small block Chevys are less expensive to build at the lower and mid-levels than most other engines. BBCs are NOT! They are actually, among the more expensive engines to build "right". BBC, while a very good powerplant, is very heavy, comparitively speaking. Adding aluminum heads is VERY expensive (more than an aluminum headed Pontiac). If a street car, power will be compromised to make it drivable. "Drivable" is a subjective term, no doubt. But to make the same level of usable power at street speeds and on "pump gas" (93 octane), a BBC needs a WHOLE LOT of attention in the heads and valve train, where the Pontiac does not.

It's true, I'm a "Pontiac bigot". BUT... It doesn't come completely from "emotion". It comes from experience and driving. After 30-plus years "in the business", I've seen and driven at least one of everything. That era of GTO is among the best balanced performance cars ever, and certainly the cream of the late '60s "crop". Don't fall for the old addage "You gotta use a Chevy to make a Pontiac run". We have MANY customers with pump-gas Ponchos running deep into the 10s (in street "trim") and many, many more that go mid 11s all week. One is hard-pressed to make a 454 do that on 93 without any power adders, and still be able to actually DRIVE it somewhere, especially in a 3,500 lb.-plus car. Of course it can be done, but at what expense?

Please note, this is not my opinion. These are true facts about what is being done today, regardless of all the old myths and superstitions.

In parting, I'll say, if you DO put the Chevy in there, more power to you. But be prepared to hear a raft of negative comments from Pontiac owners, and many challenges to race it against Pontiac-powered Pontiacs. The days of a 13 second GTO are far behind us. If you aren't at least in the 11s, stay home...

You build what you like. My ego is not involved here. Just don't surprised if my words turn out to be true!

Jim

Seconded, well stated and true!! ( From a Mopar guy too)!