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Old 09-11-2009, 07:20 PM
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355 Or 406?

I Have A 350 Std Bore With A Scat Rotating Assembly. Flat Top Forged Pistions. Patriot Perf. 190cc Heads Comp Cams 286 Hyd Roller. All New. The Motor Runs Great. I Have About 428 Hp And 460 Ft-lbs Of Tq. In A 1970 Nova. I Ran The Car At The Track A Few Times And Now I'm Hooked. I Ran A 8.9 In The 1/8 Mile. I Dont Know If Thats Good Or Not? But I Want To Get Into The Low 7's. My Question Is Should I Rebuild My Motor And Bore It Out .030 And Reuse All The Stuff I Have And Add A Shot Of Nitrous. Or Should I Build A 406 With A New Shp Block From Dart. I Know Rebuilding My Engine Would Be Alot Cheaper...will The Hp Be There? I've Been Reading Alot About 406 Builds And How There Getting About 575hp Or More Without N.o.s. And Also I Still Want It To Be Street Worthy. What Do You Guys Think?

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Old 09-11-2009, 09:06 PM
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There's no replacement for displacement. Why stop at a 406 if you were to buy an aftermarket block?
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Old 09-11-2009, 10:13 PM
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406 ...or bigger
I have an roller cammed vortec 406 and love it.
Shane
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Old 09-12-2009, 06:30 AM
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The street worthy part makes low 7's tough,low 8's high 7's is more realistic.It takes a good gear and converter to get there.What gear do you have now? What converter?your combo should get you low 8's high 7's as is.How does the car hook?What is your 60 ft time?
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Old 09-12-2009, 07:15 AM
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If you swapped all of your upper end parts over to a 406 block, and all other things being equal, you will make the same HP, but at a lower RPM, and you'll make more torque, and its peak will be at lower RPMs. Best of both worlds; more streetable, more torque, fewer RPMs to get it.

Take a look at this dyno simulation. I plugged in parameters, then all I did was change the bore and stroke for different displacements and look what happens to the curves. These aren't actual engines, just simulations to give you an idea of what you can expect. Tallest torque curve is a Caddy 500, middle is a 383, smallest is a 350. All used an insanely mild cam.
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Last edited by curtis73; 09-12-2009 at 07:21 AM.
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Old 09-12-2009, 10:19 AM
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As long as you have the gears and tranny that combo should run in the 7's. My 65 mustang has a 355 with high compression, big cam and 492 heads, glide with 3500 stall and 3.73 gears. The previous owner ran high 7's and low 8's in it. You should get a lot more out of your combo. What kind of tires are you running
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Old 09-12-2009, 12:31 PM
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Dang Curtis73, put that 500 Cad in a pickup and pull a house with it. Those numbers are in diesel engine territory.
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Old 09-12-2009, 12:36 PM
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I'm running a 408 in my camaro and i can't get enough of it seems like endless power tire shredder. .Cole
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Old 09-12-2009, 01:12 PM
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As old fords says, you have enough power to run in the 7s now. If you are
serious about going fast, money would be better spent on chassis preparation.
Converter, gears, traction, everything that helps to make the car accelerate
faster. Target 60 foot times in the 1.5 range, low 7s to high 6s are posable.

Last edited by automotive breath; 09-12-2009 at 02:25 PM.
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Old 09-12-2009, 01:46 PM
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Ditch the hyd roller for a mechanical street roller. 248-254 @.050". Get a 4500 stall 9" converter and 4.56's. It will run the numbers.
What is your MPH now?

If you have to go to a dart block to build a 406 you can build a oval port 468 BBC and go faster with even more durability for the same $$$.

Last edited by F-BIRD'88; 09-12-2009 at 01:56 PM.
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Old 09-12-2009, 02:28 PM
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Quote:
Originally Posted by Blazin72
Dang Curtis73, put that 500 Cad in a pickup and pull a house with it. Those numbers are in diesel engine territory.
That is a screencap of the actual 500 that went into my 66 Bonneville (or BonDeville as I called it) I used a diesel TC and 2.73 gears and it roasted the tires in all three gears.
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Old 09-12-2009, 06:32 PM
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355 Or 406

I Have 4.10 Gears. Tranny Is A Th400 With Trans Brake. Tci Breakaway Conv. 3000 Stall. 60FT WAS 1.79
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Old 09-12-2009, 06:46 PM
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355 Or406

When I Ran At The Track My Nova Had A Muncie M20. Ran 8.9 1/8mile. I Have Caltracs Now And Mt Street Radials. 235/60r15. I Know I'll Get Better Times With The Th400. I'm Thinking About Building The 355 With The Stuff I Already Have But Go To A Solid Roller Cam And A 125 Shot Of N.o.s
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Old 09-12-2009, 07:26 PM
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What part of Louisiana are you from?

Did you have wheel-spin with the 1.79 60 ft?
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Old 09-13-2009, 06:36 AM
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355 Or 406

Iwas From Lafayette But Now I Live In Greensboro,nc. Back To My 60ft Time I Did Have Some Wheel Spin. I Still Have To Adjust My Caltracs.
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