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Old 02-20-2009, 10:02 PM   #1
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Default alum heads vs cast iron heads

helping a guy on a 96 Impala SS. Stock has the cast iron heads. it blew the headgasket overheated and cracked the head. i know its junk. So now im helping look for new heads. If i found one that matched he might want to go that way, but if not then i could go alum or cast right.

Are there any differences in lt1 heads as far and flow, combustion chamber size and design. Which should i be looking for Alum -Cast, and not have to retune.
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Old 02-20-2009, 10:29 PM   #2
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Bit confused hear did you mean an Impala ss dont think the monty has a lt1
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Old 02-20-2009, 10:35 PM   #3
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yea sorry i got confused talking on the phone about another car while typing
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Old 02-20-2009, 11:07 PM   #4
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The cast heads flow better untouched, but the aluminum heads weigh less and of course disperse heat better. I have a set of cast 350 LT1 heads off of a 94 Caprice for sale for 50 bucks + shipping.
 
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Old 02-21-2009, 09:20 PM   #5
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The cast heads flow better untouched, but the aluminum heads weigh less and of course disperse heat better........
Not to mention that the aluminum heads have smaller combustion chambers and thus, a higher compression ratio.

Still......if I had the choice of iron heads for $50 or aluminum heads for $200......I just may opt for the irons, since the aluminums aren't $150 better in stock form.

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Old 02-21-2009, 09:36 PM   #6
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KW Do you know how much meat can be cleaned off the cast heads?
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Old 02-21-2009, 09:41 PM   #7
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KW Do you know how much meat can be cleaned off the cast heads?
No.......

To be honest, the B-body crowd don't do a lot of porting or decking of the iron heads......too much trouble!

I'd say that more than 99% of us running ported heads are using the aluminums or aftermarkets. Almost no one is running ported LT1 irons.

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Old 02-21-2009, 09:45 PM   #8
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Gotcha. Thats good to know.
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drivers side is a dream....passenger side on the other hand...i lost 2 screwdrivevers and a socket when i chucked them in the woods

u can do it



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Old 02-22-2009, 12:57 AM   #9
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What do you even use to port cast iron?
Hi-level torches? Haha
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Old 02-22-2009, 05:28 AM   #10
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You just mostly use a porting bit that doesn't have as big a opening between the cutters. We've got some at the shop that could probably be used to port a set of cast iron heads but we use them for general metal work.
 
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Old 02-22-2009, 10:37 AM   #11
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Hey CKJ Im really interested in the heads.
Do u have any pics, how many miles, have u looked them over for cracks, are they assembled so i can do a valve job mill and go?
He also wants to know if they turn out to be cracked can he get his money back?
How much would shiping be to 67801.
Hes tring to do this on a budget.

Thanks,
Mark
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