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So what's this a HiPo Big Block will bend the frame??
A CF member in another post was stating that a Hi Performance Big Block will bend the frame on our C3's??
I have the spreader bar and would be able to add some NASCAR style tubing from the forward frame to Firewall if needed for additional support.
I was deciding on getting a 427 Small Block for better handling, but now am leaning towards the Big Block 572 as I have been told that they are only 200#'s more. Besides, the road racers in the hey day ran heavy 427's and such at twisty tracks like Riverside.
Tq of the engine will break the tires lose with no traction with street tires or road race tires long before it could even consider bending the frame regardless of any engine used.
Last edited by Little Mouse; 01-12-2019 at 04:28 PM.
740HP? You would need serious mods to the trans, axles, gears, tires, etc to launch it hard. See AJRothams 650HP+ 10.4 sec build for ideas.
In 1st or 2nd gear you could only feed it whatever the tires will hold, or optionally you could smoke the tires at will. That can be fun.
But in 3rd, 4th, or 5th gear it should hook and it would pull like you just got hit by a locomotive in the backside. Woo-Hoo!!!
I have memories of one car with the speedo spinning like it thought it was a tach, That was fun to watch. I swear my back got bruised by the seat frame it hit me so hard.
I don't know how good the parts are in that one, but I'll probably spend that doing my replica LS6, and it won't be that strong.. It looks like it has good forged internals. Smokin' good deal.
I had a Z/28 I built a motor for and kept hearing a pop when I got on it pretty good. Couldn't figure it out until one day I happened to look in the side mirror and saw the body flexing in between the window and back glass. Torque was twisting the body on the frame. Probably won't twist the frame but on the unibody it can twist the body itself.
A CF member in another post was stating that a Hi Performance Big Block will bend the frame on our C3's??
Complete nonsense. Bending the frame implies that the properties of the metal in the frame have been exposed to forces beyond their "yield" point. Mild carbon steel (i.e., the frame) has incredible elastic properties, and can be bent and twisted significantly while still returning to its original shape and condition. In order for a C2/C3 frame to be twisted beyond "yield," it would have to bend so far that the body would break off the frame and shear off the mounts long before the frame would exceed yield strength. The coefficient of friction between the tires and the pavement cannot produce this amount of angular torsion applied into the frame. You can break components and crack welds over time, but you won't exceed the yield strength of the frame in torsion.
xw exactly thats a myth, just like the guy that says he lifted his front tires off the ground while he taught someone to drive. Please...
Build it see how it behaves go from there.
Do a lot of research before you pull the trigger on that engine. ProComp junk heads in particular. 360cfm heads aren't anything to write home about.
Any time I see a seller that has a catalog of information including dissing every other machine shop because they don't have high tech equipment - that most have and Skip is just now updating to - I run the other way.
Good parts, but the need for a huge sales pitch over and over and over in the same ad is a red flag to me.
IF I was going to put a 572 BB into my C3, which I would never, I would take that ad, bring it to my builder who has impeccable credentials, and tell him I want to build this motor. He would either use what is there OR more likely add and remove components based on his vast experience that would make a BETTER engine, that would probably make more power and more reliably. BUT for a couple of thousand more $...well worth it, in my opinion. BUILD your own is my opinion and advice.
Point #2....Why would you?
Besides breaking everything in the drivetrain along the way, someone is going to spend approx $10K to spin tires at will? You can pretty much do that with a 500 Gross HP SBC and not break every drivetrain component doing it...seems senseless.........just my opinion
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Bend and twist are 2 different things. Big horsepower and unibodies were a problem with hard launches if you had big enough rubber and a greeat traction system.They twist and tended to stay that way and the doors would go be out of alignment. Like its been stated, you may twist a C3 frame a bit, hell, mine bends when I lift it off the ground, but something else is going to break first before you do major damage to your frame. Are you racing it or just driving it hard. Racing, you will want to add alot of beefier components and frame reinforcements. Driving it hard, just add some beefier components that will get the sharp torque loads from burnouts and such. IE u joints, Ujoint straps, half shaft and driveshaft straps/ safety loops, etc.... Listen carefully to the guys here with the big motors. Its a lot of "been there, done that, got the scares/ scars to prove it " type of mentality and situations.
These cars had skinny polyglass bias ply tires from the factory and had a max of 435 to 500 hp in a big block car. They didnt have any traction compared to what you can get with a 40 series 10 inch wide plus tires some off these guys can stuff into their wheeel wells. So be aware of what traction you are getting and what components you are running. The small block cars can probably handle around 400 hp stock with a smallish tire and the big block components obviously can handle a couple hundred more. My estimate of small block HP comes from my buddy with a 450ish HP small block and he was able to tear up a half shaft.
If a tranny blows up and stays in the case, theres no big deal, but if a driveshaft or half shaft comes apart, you're whipping a big metal bash bar around a bunch of fiberglass hoping that it misses your meat.
My little 327, 365 HP baby has some beefier , sticky summer tires and it ate up a clutch before it would roast the tires. For the record, i ordered a 300 HP clutch becasue I went by the "made for your vehcile" charts and it didnt have a HP rating listed. I'm still not happy about that, but live and learn. Traction can be a bad thing if the components arent up to the task.
Last edited by Rescue Rogers; 01-13-2019 at 07:35 AM.
01-12-2019, 03:13 PM
So what's this a HiPo Big Block will bend the frame??
