Are ported cast iron heads better than corvette aluminium heads?
05-13-2002, 08:18 AM
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Car: '89 RS
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Are ported cast iron heads better than corvette aluminium heads?
I've checked heads cast # (14101081) on my '88 350TPI engine and i've found, that they are 305 heads (small valves 1.8x/1.5) 
Have anybody same heads on 350 engine? Can I port them, so they flow better? Or must I better look for the Vette aluminium heads? I found also some chart for that cast iron heads:
Page:
http://www.afn.org/~afn14222/flow_14101081
Can somebody give me advice, should I port them? I dont have other mods at the time, but I plan port plenum, runners, intake ja use LT1 cam or smth like that. I have short headers & K&N filter. Tnx
Have anybody same heads on 350 engine? Can I port them, so they flow better? Or must I better look for the Vette aluminium heads? I found also some chart for that cast iron heads:Page:
http://www.afn.org/~afn14222/flow_14101081
Can somebody give me advice, should I port them? I dont have other mods at the time, but I plan port plenum, runners, intake ja use LT1 cam or smth like that. I have short headers & K&N filter. Tnx
Last edited by max_est; 05-13-2002 at 08:21 AM.
05-13-2002, 04:36 PM
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The vette heads offer some advantages that dont exist with the cast heads.
1.) weight savings
2.) smaller combustion chamber (higher compression)((not always good))
3.) D-port exhaust
and some other small things
You'll be better with vette aluminums if you can afford them
1.) weight savings
2.) smaller combustion chamber (higher compression)((not always good))
3.) D-port exhaust
and some other small things
You'll be better with vette aluminums if you can afford them
05-14-2002, 07:49 PM
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Originally posted by tpi_roc
The vette heads offer some advantages that dont exist with the cast heads.
1.) weight savings
2.) smaller combustion chamber (higher compression)((not always good))
3.) D-port exhaust
and some other small things
You'll be better with vette aluminums if you can afford them
The vette heads offer some advantages that dont exist with the cast heads.
1.) weight savings
2.) smaller combustion chamber (higher compression)((not always good))
3.) D-port exhaust
and some other small things
You'll be better with vette aluminums if you can afford them
But other than that, the vette heads do offer some advantages. Even if you can't afford the vette heads, I'd get some kind of used 350 heads and port them (preferably iron L98 heads)...you can find them cheap, and they will flow a hell of a lot better than the 305 heads.
05-14-2002, 11:55 PM
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You have to remember that Al disipates heat a lot quicker than iron. This effectively lowers the compression ratio (CR), if you want to regain the "lost" CR you can deck the heads.
05-15-2002, 10:45 AM
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Car: '89 RS
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Originally posted by ir0cz
I'd get some kind of used 350 heads and port them (preferably iron L98 heads)...you can find them cheap, and they will flow a hell of a lot better than the 305 heads.
I'd get some kind of used 350 heads and port them (preferably iron L98 heads)...you can find them cheap, and they will flow a hell of a lot better than the 305 heads.
05-15-2002, 10:50 AM
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Check quote. ir0cz mention iron heads. But cast # for vette aluminium heads is interesting too.
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05-15-2002, 02:29 PM
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Casting # for L98 Iron heads 14101083, though you'll also see 14096217 occasionally. They're almost exactly the same head, the and both were also used on the 285hp 350 crate motor that gm offered back then.
05-15-2002, 10:07 PM
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Originally posted by max_est
Check quote. ir0cz mention iron heads. But cast # for vette aluminium heads is interesting too.
Check quote. ir0cz mention iron heads. But cast # for vette aluminium heads is interesting too.
05-16-2002, 12:45 AM
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Car: 1987 IROC-Z28
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Do the D-shaped exhaust ports make any difference as far as mating up to a pair of headers since the headers are not D-shaped?
Hodge
Hodge
05-16-2002, 02:20 AM
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Car: '89 RS
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Originally posted by 914Mula
I have some l98 heads for sale if you are interested.
I have some l98 heads for sale if you are interested.
If U ship them, then maybe we can make deal.. 
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