1968 400 3x2 cam

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Feb 25, 2017 | 12:14 AM

Duffeball

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Pro

Joined: Jan 2009

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From: Omaha Nebraska

1968 400 3x2 cam

Hey guys,

Got a 68 I'm doing a rebuild on. Frame is nearly back to a roller. Gonna get an engine together soon. Just wanted input on the engine goin back in and if there's any point to giving it any "upgrades".

It's a 427 that's a 3x2 400 HP. Stock 215 heads with forged 6223 crank hypereutectic Pistons. Nothing fancy. M-20 4 speed and 3.36 gears. I plan to build it as normal but didn't know if anyone's messed around with a different cam in a standard set up? What were the results? I'm of the opinion to just go standard grind.

Still want to have enough vacuum produced to run the features of the car that need it.

Feb 25, 2017 | 01:37 AM

ddawson

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Joined: Mar 2001

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From: Lincoln, CA

Before I had mine rebuilt is was a pretty standard 427, Q-jet and a compcam.

Also had headers. If the heads are still stock you could have them upgraded. Take a look at how Mark does it.

http://www.chevelles.com/forums/13-p...-pictures.html

Last edited by ddawson; Feb 25, 2017 at 01:38 AM.

Feb 25, 2017 | 02:39 AM

7T1vette

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Joined: Jan 2006

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From: Crossville TN

If you plan on keeping the car for a long time and you have some spare 'coin' to drop on the engine, you might consider a spunky roller cam.

Feb 25, 2017 | 07:42 AM

Duffeball

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Pro

Joined: Jan 2009

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From: Omaha Nebraska

Keeper

To me it's a keeper car kinda deal. That said I'm even running the stock cast exhaust manifolds. The heads are already machined and rebuilt.

Maybe there's not a ton of value to upping the cam if everything else will restrict it on the way out.

Feb 25, 2017 | 11:52 AM

ddawson

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From: Lincoln, CA

When I bought the car I had the stock manifolds. Still pulled strong but headers made a very noticeable difference.

Feb 25, 2017 | 06:36 PM

rklessdriver

Safety Car

Joined: Apr 2005

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From: Dale City VA

It would be well worth the money to put a retrofit hyd roller cam in the engine.
Will

Feb 26, 2017 | 07:07 PM

cv67

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From: altered state

St. Jude Donor '05

x2 dawson and reckless

The right cam headers and good tuning really wakes up a BBC doesnt take too much to have a good time

Edit: love the sound of solid flat tappets but HR is probably better long run

If you dont DIY Mark an excellent choice..or listen to Will hed never steer you wrong.

Last edited by cv67; Feb 26, 2017 at 07:35 PM.

Feb 26, 2017 | 08:17 PM

Les

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Joined: Dec 1999

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From: Sierra Foothills CA

Have you discussed valve to piston clearance with your builder? I don't know what kind of pistons you're using but the closed chamber heads make it important to know how much clearance you're working with, and that can determine how much cam you can use. Rollers, with their fat lobes, will hang the valves open longer than a flat tappet cam. Just something to think about.