Hotcam kit rocker arms
09-13-2017, 09:00 PM
#4
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Those are the hot cam rockers like the others said quality stuff they have the bowtie's on them that's the give away. It looks like whoever redid his engine went the el cheapo route and used Impala heads instead of the aluminum LT1 heads.
The upside though is that they're iron heads and you have iron heads and an iron block if you want to boost the motor later down the line it's the perfect candidate.
I would be wondering how he ended up with Iron heads though on an LT1. Did he swap the motor out from an impala? Did the engine over heat and warp the original aluminum heads that badly? It's a mystery for sure. Just an odd find.
The upside though is that they're iron heads and you have iron heads and an iron block if you want to boost the motor later down the line it's the perfect candidate.
I would be wondering how he ended up with Iron heads though on an LT1. Did he swap the motor out from an impala? Did the engine over heat and warp the original aluminum heads that badly? It's a mystery for sure. Just an odd find.
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09-14-2017, 10:13 AM
#8
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Yeah I posted before checking. 
Even though allegedly/supposedly/reportedly the iron heads flow better than aluminum in stock form, in the long run you are far better off going with an aluminum head in every way imaginable.
Even though allegedly/supposedly/reportedly the iron heads flow better than aluminum in stock form, in the long run you are far better off going with an aluminum head in every way imaginable.
09-14-2017, 05:15 PM
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What? The LT1 Iron heads have always been less problematic than aluminum but less popular because they're old tech iron. It's the aluminum headed LT1's that end up blowing gaskets and having heat problems. It's like a completely different world between F-body and Caprice/Impala guys. They run the same mods but never have the same issues. N/A, Supercharged or Boosted Iron heads make for pretty damn strong LT1. Def not going to be a disadvantage OP.
09-15-2017, 11:07 AM
#12
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The weight savings is one, also an aluminum head dissipates heat quicker, which along with reverse cooling is the reason why the LT1 can run significantly higher CR which equates to better power efficiency. I have no idea what is meant by "less problematic." I haven't seen anything "problematic" using aluminum heads even with those using a serious power adder. If doing so, there are ways to keep the heads on the block and keep them sealed.
09-15-2017, 11:31 AM
#13
Iron heads are more tolerant of maintenance/service abuse which could lead to massive overheating; that's why they were better suited to general B-body / police / taxicab use.
Aluminum relaxes and loses its properties at a lower temperature than cast iron does. I'm talking bulk overheating here, not just combustion chamber surface temperatures (which of course will be very high in serious performance applications).
Iron LT1 heads can and have made some serious power, but in a competent performance enthusiast's hands, no way are they better.
Viper, if you ever decide to run more cam ....stouter valvesprings, first make sure those heads have been upgraded to screw-in rocker studs. Stock are pressed-in.
Aluminum relaxes and loses its properties at a lower temperature than cast iron does. I'm talking bulk overheating here, not just combustion chamber surface temperatures (which of course will be very high in serious performance applications).
Iron LT1 heads can and have made some serious power, but in a competent performance enthusiast's hands, no way are they better.
Viper, if you ever decide to run more cam ....stouter valvesprings, first make sure those heads have been upgraded to screw-in rocker studs. Stock are pressed-in.