Winter project
- Thread starter docpan
- Start date
dllubin
Don
I had to wear heavy gloves to set up my DCNFs. My phenolic spacers are only slightly larger than the carb bases sothey offer no radiant shielding to my fingers. I particularly like the heat shield above the headers. Can you describe what you are using and how it is kept in position? I need to do the same thing. Right now my engine is sitting on the workbench so it would be the ideal time to figure it out.
Thanks,
Don
docpan
True Classic
The metal heat shield is flexible but keeps it shape so it is pushed in between the exhaust and intake manifolds . Something like this
https://www.amazon.com/Heatshield-P...8&qid=1519228950&sr=8-26&keywords=heat+shield
The phenolic plate were made by a speed shop I found on ebay. They make custom carb plates. It took a while but he finally got them done. Measurement was 160mm by 140mm. They could be a little wider like 180. The plates were 1/2 in thick, had to replace the studs to accommodate the thicker material.
Dashman's Hot Rod and Speed Parts in Wisconson
I also used this to cover the water pipe that runs under the manifold.
https://www.ebay.com/itm/Cobra-99-0...-75in-x-7in-/352102246219?hash=item51faede74b
The k&n air cleaners still fit under the cover!!
https://www.amazon.com/Heatshield-P...8&qid=1519228950&sr=8-26&keywords=heat+shield
The phenolic plate were made by a speed shop I found on ebay. They make custom carb plates. It took a while but he finally got them done. Measurement was 160mm by 140mm. They could be a little wider like 180. The plates were 1/2 in thick, had to replace the studs to accommodate the thicker material.
Dashman's Hot Rod and Speed Parts in Wisconson
I also used this to cover the water pipe that runs under the manifold.
https://www.ebay.com/itm/Cobra-99-0...-75in-x-7in-/352102246219?hash=item51faede74b
The k&n air cleaners still fit under the cover!!
lookforjoe
True Classic
Nice! I also like that heat shield you have - I'll keep that item in my watch list for future reference 
dllubin
Don
Thanks for the information. That heat shield looks like it could do the trick for me. It will be nice to be able to adjust the carbs without wearing a pair of smouldering gloves!
Glad your air cleaners still fit. The 74 engine cover has much less clearance than the 79 does. I'm just hoping that going to the slightly taller 1500 is still going to clear the cover. I'll find out when I put the engine in. With the 1300, I was using a low profile Sprint filter that went with their dual DCNF manifold and it cleared. I'm using the DCNF configuration where only the auxiliary venturis stick out above the top of the carbs to allow unimpeded air flow with the low profile filter.
Thanks,
Don
Fiataccompli
Chris Granju
so, these oversized spacers would be something that the referenced (Dashman's) shop would now have some sort of template for?
How are you fixing the heat shield to the manifold?
How are you fixing the heat shield to the manifold?
Dr.Jeff
True Classic
Docpan, thanks for the added input. I am wondering the same question as Chris, is this something he already offers or can reproduce easily, or is it a custom built piece? If you don't mind, please tell the price for it also. Thanks.
Regarding the heat shield. Here is another version of that type product:
As you can see it is easily cut, bent/shaped and retains the profile. There are three layers; reflective aluminum on top and bottom and a air-gap and insulation layer in between. Here is the maker of this version: http://www.dciperformance.com.au/
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dllubin
Don
I think that the 75-78 covers have that strip. I don't remember if the hinge side higher as well or if the cover have a tilt to it.
Dr.Jeff
True Classic
I only have the later style to reference so not certain how it is on the early ones. But it sounds like you could make some "stand-offs" for the early engine cover. Raising the hinges and the latch to achieve a new higher position. This might help to vent the hot air as well as help clear the taller engine/air filters.
docpan
True Classic
He makes spacers for dcnf carbs, so he has the cad file for the standard size. He was selling these for 24 a piece. The custom size was 50 each, he should have the file for the custom size as well.
Chris, the metal heat shield just wedges in between the intake and exhaust manifold. I have never had it fall out.
Chris, the metal heat shield just wedges in between the intake and exhaust manifold. I have never had it fall out.
Fiataccompli
Chris Granju
Thanks. I have new, thinner spacers for my DNCFs that I need to put on, so these (or even the ones they have as stock items might be something to consider. My setup is 36 DCNFs and was done by the PO, an old friend. His comment was that the final improvements (besides airflow to them for breathing) would be a heat shield or tray...
Dr.Jeff
True Classic
Thanks. I saw the smaller standard-size insulators on his site (shown below), but not the larger ones you have. Good to know he will make them to spec.
Looking at the stock (I think?) one in the pic below gives me a thought. Perhaps use the standard size insulator(s) from the eBay seller (above) in combination with a larger flat heat-reflective plate under it. Something like this (below), but using a aluminum plate covered with a heat-reflective film on the bottom instead of the large phenolic layer:
The thought being to address two different types of heat transfer: The aluminum plate with reflective layer (underneath) will direct the rising radiant-heat away from the carb, and the insulator block will separate the carb from the transfer of conductive heat up from the intake manifold. I'm honestly not sure if a combination like this would be more or less effective than the larger thick insulator platform. But it would allow the lower reflective layer to be made as large as you wish and in any shape that is needed (like the example above). Adding a fan to direct the hot air away from the area would address the third type of heat transfer, convection.
darwoodious
Darin Nelson
I bet you could trade that '74 cover for a '76 cover...
dllubin
Don
I wonder if a 74 cover fits anything other than a 74? I can't remember what compelled them to go with the taller cover in 75. Maybe it had something to do with more emissions equipment in addition to the catalytic converter.