[johnta1]

It is 462 CID
The stock 455 piston is 4.181 so .030" overbore is 4.21" bore.
Stock stroke is 4.21"

[Skidmark]

Originally Posted by johnta1

It is 462 CID
The stock 455 piston is 4.181 so .030" overbore is 4.21" bore.
Stock stroke is 4.21"

Thanks,
Any idea of approx HP / torque? Has a cliff built Qj. Stock intake. Factory exhaust manifolds.

[25stevem]

A motor can not make any torque or hp without a Cam in it hint….hint!

Is what you posted what you are keeping in the motor, because it’s kinda small for a 462 even with basically stock heads.

[Skidmark]

Originally Posted by 25stevem

A motor can not make any torque or hp without a Cam in it hint….hint!

Is what you posted what you are keeping in the motor, because it’s kinda small for a 462 even with basically stock heads.

Yeah, for now. Engine runs good for a cruiser. I don't race. After I paint the car, I might change the cam.

I know from being on this forum for awhile, that many don't care for the xe268H.

Would a 068 cam be better?

[25stevem]

No, that XE is still a far better pick for your CID motor then the 068.

I hope that the heads you are running are set up with springs and clearances other then stock, because that cams lift would have stock parts at there very liming or over!

Anyway with stock heads even that Cam is done by 5200, and with stock rods you go not want to go above 5500 anyway so you have a far lesser chance of blowing the motor up.

If your happy with its street manors now and with it making between 380 and 400 Hp then that’s all that matters !

[Skidmark]

Originally Posted by 25stevem

No, that XE is still a far better pick for your CID motor then the 068.

I hope that the heads you are running are set up with springs and clearances other then stock, because that cams lift would have stock parts at there very liming or over!

Anyway with stock heads even that Cam is done by 5200, and with stock rods you go not want to go above 5500 anyway so you have a far lesser chance of blowing the motor up.

If your happy with its street manors now and with it making between 380 and 400 Hp then that’s all that matters !

All I know about the springs and clearances is what was on the receipt, but hey if you think I'd be between 380-400 HP, then I'm very happy.

I know the 1972 YS engine was rated @250 from the factory.

[Skidmark]

Here are the springs

[Baron Von Zeppelin]

Originally Posted by Skidmark

I know the 1972 YS engine was rated @250 from the factory.

What car is the engine running in ?

You can tell them you have a bored and stroked 400 (sounds exotic)
or a Squared 455 with equal bore & stroke (sounds like advance level engineering)
or a 462

Or throw all of that out in one sentence .

[Skidmark]

Originally Posted by Baron Von Zeppelin

What car is the engine running in ?

You can tell them you have a bored and stroked 400 (sounds exotic)
or a Squared 455 with equal bore & stroke (sounds like advance level engineering)
or a 462

Or throw all of that out in one sentence .

I like it! Makes it sound special to the untrained ear.

I pulled it out of a 72 grandprix and now it is in my 72 lemans sport.

[grandam1979]

Originally Posted by johnta1

It is 462 CID
The stock 455 piston is 4.181 so .030" overbore is 4.21" bore.
Stock stroke is 4.21"

Unless I’m reading this incorrectly none of this is correct? 4.181 is .030 over for a 455 .060 for a 400 block. 4.211 is .060 over 455 and would be .090 over for a 400 block.

[Skidmark]

Originally Posted by grandam1979

Unless I’m reading this incorrectly none of this correct? 4.181 is .030 over for a 455 .060 for a 400 block. 4.211 is .060 over 455 and would be .090 over for a 400 block.

You're right. Per Butlers website.

400 bored .060 over is 4.181
455 bored .030 over is also 4.181

[johnta1]

Yes, I wrote the bore size wrong, it would be .030" over (455) which is 4.181.
But the CID is still correct at 462.

It would need 455 pistons because of the pin ht. and the rod length.

[Skidmark]

Originally Posted by johnta1

Yes, I wrote the bore size wrong, it would be .030" over (455) which is 4.181.
But the CID is still correct at 462.

It would need 455 pistons because of the pin ht. and the rod length.

Thanks John

[Skidmark]

Does anyone know approx HP and torque would be? One member thought 380-400 HP he didn't mention how much torque. My car will never see a Dyno, so I ask here.

One more time:

1972 YS 400 bored ..060, 455 crank conversion to fit 400 block, now 462 cid, 7k3 heads stock, comp cam xe268H, cliff QJ, factory exhaust manifolds
Factory intake
Dual exhaust

[Dragncar]

Its a 455 with a decent sized cam, nice q jet on our fine factory intake.
Its going to make the 380-400 HP as easy as falling out of a tree and be near 500 ft lbs.
I would find some Ram Air/HO manifolds or 1 3/4" headers and run it.
Should be a very fun to drive, push you back in your seat kind of ride.

[tom s]

My 455 with SP II cam and dead stock 48s made I think close to 450.The build was on this site.Tom

[Skidmark]

Originally Posted by Dragncar

Its a 455 with a decent sized cam, nice q jet on our fine factory intake.
Its going to make the 380-400 HP as easy as falling out of a tree and be near 500 ft lbs.
I would find some Ram Air/HO manifolds or 1 3/4" headers and run it.
Should be a very fun to drive, push you back in your seat kind of ride.

Thank you,
Exactly the kind of info I was looking for. I have wanted a pair of those ram air/HO manifolds. They're in my future for sure.

[Skidmark]

Wondering if I have posted enough info about my engine to tell me what the compression ratio is. It will not run good on anything less than 93 octane.

I've read XE cam might be the problem.

Thanks

[Matt Meaney]

a ballpark on the compression would be about 9.25:1, could go a little one way or the other depending on specifics.
i had basically that same engine a long time ago in my daily. it had a 041 cam with 1.5.2 rockers. nice heavy idle sound at 750 rpm in gear and great drivability.

[Skidmark]

Matt, thanks man.