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#81
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I have seen that car over the years scouring the internet for info. Very Popular, you must be proud! |
#82
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That is a nice set up, I was thinking of the one Tom S. is working on as a Reproduction, a 1963 Tunnel Port, I think? This one in your car is the lower Tunnel Port I guess, maybe you can explain the difference since I am new to the 421 Tunnel port. I myself use 1966 Tri-power Rochester's. |
#83
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#84
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Mikes Reply:
Tom S., began this project and is now working, with others, to finish this short run of the 1962 - 63 Tunnel Port Intakes 421 ci SD, there are two versions one early and one later for say 67-70's. Here are the prototype patterns as they are being made on a Lazor printer: If you want one, you'd better let me know and I will pass on the word! Option is directly PM Tom S. on PY forum. Last edited by TRADERMIKE 2012; 05-13-2022 at 07:04 AM. |
#85
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From a value point for resale, I would keep the Ram air 5 in it to increase the overall value? JMO See my other Threads for a photo of your car. |
#86
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Mike,get your description right.We are building D port Tunnel RAMS!Not Tunnel PORT.Tom
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#87
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OK, 20+ off topic posts and counting . . . .
Two questions: Is the “421 hole” only for iron heads or do aluminum heads need it as well? Has anyone plugged those three holes in the head instead of tapping the block? Seems like it would be easier, especially with aluminum heads.
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" Darksiders Rule "
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#88
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#89
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Since no one has replied to your question, I read a lot on the subject on this forum and this is what I think: (1) yes (2) Do the Aluminum heads the same way, the holes are "not" drilled from the Manufacture, as far as I have read. It is especially important to drill the holes between the 2 Siamese Exhaust ports. |
#91
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Thread closer lol
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#92
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Maybe he just likes to type.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#93
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Un subscribing
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#94
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Guess this thread is done.
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" Darksiders Rule "
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#95
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Why did Pontiac add those cooling holes to the 421 SD but not to millions of regular everyday Pontiac V8s?
If it was truly beneficial why didn’t they? The added tooling and machining cost could have been a factor. Perhaps potential long term durability issues? The 421 SD, produced in very limited numbers mostly for racing, had no factory warranty so any failures wouldn’t end up as a liability. I’m guessing not many Pontiac engine builders today offer that particular modification on their list of different options, maybe I’m wrong. If it was something that really made a difference everyone would be doing it. Thread closed. 1964 421 HO block, 370 hp code 45B for manual trans, no special added cooling holes. |
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