difference in aluminum and cast iron heads?
06-23-2005, 01:02 PM
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Car: 85 Monte Carlo, 93 C1500, 98 Neon
Engine: 355, 4.3L, 2.0 DOHC
Transmission: T5, 4L60E, T350
Axle/Gears: 2.73, 3.42, 3.94
difference in aluminum and cast iron heads?
I was looking in the Jeg's catalogue at intakes for my '87 Firebird engine. I know the intake bolt angles on the '87 and later heads are different than the the '86 and earlier.
What's the difference between aluminum and cast iron heads in the '87 and later style? Jeg's lists different part numbers for '87 and later aluminum and cast iron.
I thought it strange for there to be a difference late model heads just because they're made of different materials.
What's the difference between aluminum and cast iron heads in the '87 and later style? Jeg's lists different part numbers for '87 and later aluminum and cast iron.
I thought it strange for there to be a difference late model heads just because they're made of different materials.
06-23-2005, 01:31 PM
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Transmission: 5
the intake bolt angles on the '87 and later heads are different
The aluminum heads have the early-model bolt pattern; only the iron heads have the different one.
06-23-2005, 01:35 PM
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Car: 85 Monte Carlo, 93 C1500, 98 Neon
Engine: 355, 4.3L, 2.0 DOHC
Transmission: T5, 4L60E, T350
Axle/Gears: 2.73, 3.42, 3.94
Oh, I get it now. The late model aluminum heads are basically identical to the early model heads, whereas late model iron heads changed the intake manifold bolt angle.
Thanks.
Thanks.
06-23-2005, 07:03 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Aftermarket aluminum heads are generally available with either bolt angle.
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