L66 396? Is iron crank ok? - Team Camaro Tech
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post #1 of 10 (permalink) Old Apr 2nd, 10, 08:30 PM Thread Starter
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John
 
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L66 396? Is iron crank ok?

I just purchased a 1970 SS Camaro (have biuld sheet) and openned up the engine yesterday to see what was in it. I was not able to tell what engine it was at purchase because the numbers had been machined off during a rebiuld done by one of the previous 4 owners.

Anyway, I was expecting the L34 396 but when I openned it up I saw "truck" written on the heads so this implies an L66 396. It appears during the rebiuld the following things were done:

-the heads were ported
-new Scorpian roller rockers
-new roller lifters
-new rods
-Thumper Cam
-Vortek II intake (saw this at purchase)
-holly 750 (saw this at purchase)

This weekend I am removing the thumper cam (which required a vaccum pump for the power breaks) and putting in a milder cam to get a little better street performance:

Duration @ .050": 214/222
Adv. Duration: 270/280
Lift: .514/.537
Lobe Sep: 112 Deg.
1200-5200, Good Idle, Street Performance, 9.0:1 CR

QUESTION: The L66 396 had an iron crank. Then engine ran strong prior to openning it up so I am not going to change pistons or crank. Should I be concerned with having an iron crank instead of a forged steel crank with the top end rebiuld mentioned above. The car as 3.73 gears and an M21 trans. I will use it for daily driving and I drive pretty hard when the cops arent aroud
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post #2 of 10 (permalink) Old Apr 2nd, 10, 10:42 PM
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Re: L66 396? Is iron crank ok?

What is the casting number and casting date of the block?

They could have just put the other "truck" heads on after the rebuild.

Have you confirmed it is a cast crank? Sorry I could not tell from what you posted.

Obviously you know a forged crank would be better than a cast crank. But from the way it sounds you are going to use the car, I would not be afraid to run a cast crank.

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
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post #3 of 10 (permalink) Old Apr 2nd, 10, 10:59 PM Thread Starter
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Re: L66 396? Is iron crank ok?

Not sure what the casting number it is. I think it was machined off before they put the intake on. Isnt it on the top of the block near where the intake bolts on?

Last edited by jtwoods4; Apr 2nd, 10 at 11:15 PM.
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post #4 of 10 (permalink) Old Apr 2nd, 10, 11:26 PM
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Re: L66 396? Is iron crank ok?

Nothing wrong with running a cast crank, it's really the last piece of the rotating assembly to go over board on, first get good pistons, rods, rod bolts, main studs etc...

The casting # is on the back of the block, drivers side.
The front pad on the pass. side will tell you more specifically what it is, but the numbers in the back will give you a general idea.

The only Mustang I'd ever own is a Fender.

'68 333" Camaro
'14 5.0 Mustang
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post #5 of 10 (permalink) Old Apr 3rd, 10, 12:16 AM
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Re: L66 396? Is iron crank ok?

Casting number is back on back part of the block on the bellhousing flange area.

See this link.
http://www.yearone.com/updatedsingle...gineinfo6.html

Casting date will either be on the back of the block on the bellhousing flange or on the passenger side of the block by where the engine mount bolts on.

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
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post #6 of 10 (permalink) Old Apr 3rd, 10, 08:33 AM Thread Starter
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Re: L66 396? Is iron crank ok?

Yeah, it was machined of than one of the previous owners did a rebiuld.
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post #7 of 10 (permalink) Old Apr 3rd, 10, 11:29 AM
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Re: L66 396? Is iron crank ok?

Very strange why the casting number in the back would have been machined off. Not normally done just for a rebuild. And I can't think of a good reason why.

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
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post #8 of 10 (permalink) Old Apr 3rd, 10, 12:55 PM Thread Starter
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Re: L66 396? Is iron crank ok?

Maybe I was looking in the wrong spot, I will check again.
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post #9 of 10 (permalink) Old Apr 3rd, 10, 07:17 PM
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Re: L66 396? Is iron crank ok?

John..for everything you are doing..the cast crank will be up to snuff +.

George
68 Camaro
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post #10 of 10 (permalink) Old Apr 6th, 10, 03:32 PM
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Re: L66 396? Is iron crank ok?

Ditto on the cast crank. Plenty for that cam.
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