alum heads vs cast iron heads - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 11 (permalink) Old 02-20-2009, 10:02 PM Thread Starter
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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.

77 camaro 454 (project)
79 GMC c10 454 (sold)
86 Camaro 350 (drag)
89 S10 305 (peg legger)
93 Firebird LT1 (Daily Driver)
(Pasesetter LT, ORY, Flowmaster,K&N FIPK, CSR Electric Water pump,Air Foil, 160 Thermostat, MSD wires, NGK TR6, 150 Wet Shot NOS, PCMforless tune.)

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post #2 of 11 (permalink) Old 02-20-2009, 10:29 PM
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Bit confused hear did you mean an Impala ss dont think the monty has a lt1

95 lt1 4l60e headers ory catback k&n cold air free mods pa racing k- member a arms eibach springs I think you can take me its just a 305
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post #3 of 11 (permalink) Old 02-20-2009, 10:35 PM Thread Starter
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yea sorry i got confused talking on the phone about another car while typing

77 camaro 454 (project)
79 GMC c10 454 (sold)
86 Camaro 350 (drag)
89 S10 305 (peg legger)
93 Firebird LT1 (Daily Driver)
(Pasesetter LT, ORY, Flowmaster,K&N FIPK, CSR Electric Water pump,Air Foil, 160 Thermostat, MSD wires, NGK TR6, 150 Wet Shot NOS, PCMforless tune.)
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post #4 of 11 (permalink) Old 02-20-2009, 11:07 PM
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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.
post #5 of 11 (permalink) Old 02-21-2009, 09:20 PM
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Quote:
Originally Posted by CKJ View Post
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.

KW
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post #6 of 11 (permalink) Old 02-21-2009, 09:36 PM
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KW Do you know how much meat can be cleaned off the cast heads?

03 Z06, LTs, A&A P1SC running 6psi, 550/471
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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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post #7 of 11 (permalink) Old 02-21-2009, 09:41 PM
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Quote:
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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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post #8 of 11 (permalink) Old 02-21-2009, 09:45 PM
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Gotcha. Thats good to know.

03 Z06, LTs, A&A P1SC running 6psi, 550/471
Quote:
Originally Posted by 94FormulaBird View Post
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



I am permanently banned from all petting zoo's for getting to friendly
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post #9 of 11 (permalink) Old 02-22-2009, 12:57 AM
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What do you even use to port cast iron?
Hi-level torches? Haha


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post #10 of 11 (permalink) Old 02-22-2009, 05:28 AM
CKJ
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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.
post #11 of 11 (permalink) Old 02-22-2009, 10:37 AM Thread Starter
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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

77 camaro 454 (project)
79 GMC c10 454 (sold)
86 Camaro 350 (drag)
89 S10 305 (peg legger)
93 Firebird LT1 (Daily Driver)
(Pasesetter LT, ORY, Flowmaster,K&N FIPK, CSR Electric Water pump,Air Foil, 160 Thermostat, MSD wires, NGK TR6, 150 Wet Shot NOS, PCMforless tune.)
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