Hi

I am building turbo engine for my Valiant and I am thinking about the rear end. Could the 7 1/4 suregrip handle behind 400hp slant? If it breaks, what is the first thing to break?
I have a 8 1/4 sg rear too, but the stupid finnish law won`t let me use it

Why not???

How would they know????

Or just make it look old and used.....

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Wow, now that's some big brother in action. When they start lining people up for the furnaces it will be a good thing you can escape quickly with your 400 hp slant six powered dodge with 8 1/4 sure grip rear.

I think 400 hp is too much for a 7 1/4, you will eventually shear off the axles or snap the teeth off the ring gear or break the yoke off the pinion. I'm just guessing, because I've never kept a 7 1/4 around long enough to break it. Then again, it could last a long time if you arn't really slamming it. If you must keep the 7 1/4, you'll have to go easy on it. I think they put 7 1/4 rears behind 318 engines, but a stock 318 isn't 400 hp either.

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1980 Aspen 225 super six

I actually have 4 choices:

1. Keep 7 1/4 rear, becouse this car originally came with it
2. Build the engine around 170 block, the car originally came with 170.
3. Use 3 on tree, not a choice really.
4. Change the 8 1/4 rear after registeration and drive with "illegal" car.

This all becouse if you change over 35% of original parts, it`s a "new" car. You have to pay new car taxes and the car have to pass new car requirements Engine 15%, transmission 9%, rear axle 10%, steering 3% +suspension, brakes, seats etc...
I am going to paint everything so I probably am going with choice 4...
But I`d still like to know if I could manage with 7 1/4.

In America, there would be a revolution over that. Heck, we had a revolution over a tax on tea.

Good luck, and fight the power!

Greg

So how will they know the 8-1/4" isn't original?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Don't be too hard on the Finns - in California we are required to retain 100% of the original emission components for 1976 and later autos, even if the car runs cleaner with aftermarket products! Big brother is alive and well and draining lots of $$$ out of car enthusiasts here in Calif.

Of course, the simple solution is to own pre-1976 vehicles, which is more fun anyway.

Good luck with the alterations. Perhaps you can register it/have it inspected with the 7 1/4 and other original parts, and change to the 8 1/4 afterwards?

Steve

1966 Dodge Dart GT

MFJ, if you got a 7 1/4 with sg, I might be interested in buying it, if you wont keep it.

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

I would say that 180 - 200 rear wheel HP would be the max for a 7 1/4 SG
400 HP would break one fast.
I have broken axle shafts, pinion stems and the SG's pinion gears (spider gears) out of 7 1/4 rears, they are not made to handle alot of torque.
DD

Thanks Doc

So anything could break with 400hp.
I´ll have to change 8 1/4 after registeration and hope that the inspector won`t notice it afterwards. Some of those knows old cars well and even own these too.

skraecken: No, I don`t have SG.

OK

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

Hey

Down here in Argentina we're known for our outrageous stupid laws and our great sideways to that. I'd suggest, as an experienced law "twister" (not breaker) that you install your 8 1/4 BEFORE the inspection, that way you can oil it and get a nice ride over a dirt road and it will look even older, greasier and dirtier than the car... Unless you tell me that finn inspectors can tell the diffrence btwn a 7 1/1 and a 8 1/4 mopar rear end, if this' the case I gently fold my knee to them. This way you'll get your car inspected with the 8 1/4 already in. Same goes to minor, undetectable mods, unless they can tell by your "I'm guilty" face

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

400 hp? I wanna see that when you're through. Are you talking standard or metric horsepower??

P.S. - the 8.25 certainly won't be new, so I don't understand the "logic".....

Like Dan sed - unless they are mopar experts, how in the hell would your government officials know?

D/W

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If it ain't broke, fix it!

What is difference between standard and metric horsepower?
All you need is a big turbo. It`s not that difficult Legally `65 Valiant could have ~280hp But I can get a 120 hp dyno slip for inspection
It is "new" to this car. When you change over 35% parts that are not the original parts, the car must be taxed again, it is new car then... This is a stupid law to all car and motorcycle builder, everyone hates it. And tries to twist it...
Cars must be inspected every year here in Finland. But I´ll take the risk and hope that they won´t notice it.
Ok, this has gone far away fron the original subject

Easy now!

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23