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02-20-2009, 10:02 PM
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#1
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Regular Member
Join Date: Sep 2008
Location: Dodge City KS
Posts: 79
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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.
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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.)
Last edited by 93formulat-top; 02-20-2009 at 10:40 PM.
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02-20-2009, 10:29 PM
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#2
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Regular Member
Join Date: Dec 2008
Location: Montezuma IN
Posts: 22
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Bit confused hear did you mean an Impala ss dont think the monty has a lt1
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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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02-20-2009, 10:35 PM
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#3
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Regular Member
Join Date: Sep 2008
Location: Dodge City KS
Posts: 79
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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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02-20-2009, 11:07 PM
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#4
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Administrator
Join Date: Dec 2006
Location: Farnham, VA
Posts: 13,492
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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.
__________________
Chris
The Few, The Proud, and the Crazy... LT1 owners 
Something wicked this way comes!!
Quote:
Originally Posted by SStrokerAce
BTW Chris.... you're going to think this new cam is INSANE!!!! Then again it is, not many guys with a LT motor have that many cubes and want that RPM with a hyd roller!!!!!
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02-21-2009, 09:20 PM
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#5
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Global Moderators
Join Date: Dec 2007
Posts: 1,265
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Quote:
Originally Posted by CKJ
The cast heads flow better untouched, but the aluminum heads weigh less and of course disperse heat better........
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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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02-21-2009, 09:36 PM
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#6
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Administrator
Join Date: Jul 2006
Location: Virginia Beach
Posts: 7,375
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KW Do you know how much meat can be cleaned off the cast heads?
__________________
Working on a LT1 is like making a deal with the Devil. For a minute you think are getting ahead. But we all know how its going to end up. 
The Few, The Proud, and the Crazy... LT1 owners
Quote:
Originally Posted by 94FormulaBird
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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I am permanently banned from all petting zoo's for getting to friendly
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02-21-2009, 09:41 PM
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#7
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Global Moderators
Join Date: Dec 2007
Posts: 1,265
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Quote:
Originally Posted by 03slowZ06
KW Do you know how much meat can be cleaned off the cast heads?
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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.
KW
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02-21-2009, 09:45 PM
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#8
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Administrator
Join Date: Jul 2006
Location: Virginia Beach
Posts: 7,375
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Gotcha. Thats good to know.
__________________
Working on a LT1 is like making a deal with the Devil. For a minute you think are getting ahead. But we all know how its going to end up.
The Few, The Proud, and the Crazy... LT1 owners
Quote:
Originally Posted by 94FormulaBird
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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I am permanently banned from all petting zoo's for getting to friendly
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02-22-2009, 12:57 AM
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#9
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Regular Member
Join Date: Apr 2006
Posts: 481
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What do you even use to port cast iron?
Hi-level torches? Haha
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02-22-2009, 05:28 AM
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#10
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Administrator
Join Date: Dec 2006
Location: Farnham, VA
Posts: 13,492
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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.
__________________
Chris
The Few, The Proud, and the Crazy... LT1 owners
Something wicked this way comes!!
Quote:
Originally Posted by SStrokerAce
BTW Chris.... you're going to think this new cam is INSANE!!!! Then again it is, not many guys with a LT motor have that many cubes and want that RPM with a hyd roller!!!!!
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02-22-2009, 10:37 AM
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#11
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Regular Member
Join Date: Sep 2008
Location: Dodge City KS
Posts: 79
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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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