A question about Holleys

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Captainkirk

Captainkirk

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I see Summit is now offering Holley carbs in the standard zinc dichromate finish, and also now in polished aluminum, which appears to be cheaper. Any reason why the aluminum should be avoided or discouraged over the standard Holley carbs?
 
Captainkirk said:
I see Summit is now offering Holley carbs in the standard zinc dichromate finish, and also now in polished aluminum, which appears to be cheaper. Any reason why the aluminum should be avoided or discouraged over the standard Holley carbs?
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I believe the aluminum finish would oxidize over time whereas the dichromate is more durable. I was just looking at the 660 center squirters with shaved choke towers.
PS I know that they're discontinued.
 
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If the aluminum is anodized then no issues with oxidization. The biggest issue with aluminum is heat soaking. You will need to run a spacer and shield. I used this on my Quick Fuel that has a PTFE (Teflon) Black Diamond coating to combat heat too. With these my fuel bowls were not even warm to the touch with the motor fully warmed up and sitting with the hood closed and 185 water temp. Heat is the biggest issue with todays fuel, it lights off very fast which means it will boil in the bowls and the bowls will dry out if the car sits and the longer it sits the more evaporates.


I used this kit.
Holley 108-70 Heat Shield Kit
 
dano said:
If the aluminum is anodized then no issues with oxidization. The biggest issue with aluminum is heat soaking. You will need to run a spacer and shield. I used this on my Quick Fuel that has a PTFE (Teflon) Black Diamond coating to combat heat too. With these my fuel bowls were not even warm to the touch with the motor fully warmed up and sitting with the hood closed and 185 water temp. Heat is the biggest issue with todays fuel, it lights off very fast which means it will boil in the bowls and the bowls will dry out if the car sits and the longer it sits the more evaporates.


I used this kit.
Holley 108-70 Heat Shield Kit
Click to expand...
The aluminum is not anodized but rather polished that's why it's cheaper and they offer the dichromate as an alternative.
 
yellow rose said:
This is the only heat shield I’ve used that actually worked. I won’t use anything else.

Order Products
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Are these not for street cars?
WARNING
This product is not recommended for the use on:
1. Intakes with heat crossovers and EGR values in the intake.
2. Straight 4-6-8 cylinder motors where the exhaust and intake overlap.
3. Some castiron intakes have had an issue also
REASON: The polycore is an excellent insulation but it cannot take the extreme heat
that the exhaust creates. This causes it to get soft or melt.
 
yellow rose said:
This is the only heat shield I’ve used that actually worked. I won’t use anything else.

Order Products
Click to expand...

Have you used their polycore spacer/gaskets? I looked at these pretty hard, but read the heat warnings posted by A56 and went with the Holley which I found was basically a copy of what Chevy put on their Corvettes from the factory.
 
dano said:
Have you used their polycore spacer/gaskets? I looked at these pretty hard, but read the heat warnings posted by A56 and went with the Holley which I found was basically a copy of what Chevy put on their Corvettes from the factory.
Click to expand...


Yeah, I use them but I don’t use heated intake manifolds. If it has a heat crossover I block it, even on street cars.
 
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