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Home » Public Forums » GMCnet » Low pro carb hat. What's a good lowpro hat? Want my hatch flush again
Re: Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362503 is a reply to message #362496] Tue, 23 February 2021 15:29 Go to previous messageGo to previous message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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Senior Member
Thinking back on this Jeep snorkel, someone out there had it on their 455 and ran it on a chassis dyno. Above 3K rpm it fell flat on its face. Whoever it was running the dyno speculated that the Jeep snorkel was the cause. The air coming in at 3K did not have time to straighten out after making the right angle turn and the turbulence of the flow was interrupting the effectiveness of the venturi effecting the FA mixture. They placed a 1" spacer between the snorkel and the carb to give the air time to straighten out. That took care of the problem, and engine pulled strong to 4K. Wish I could remember who that was, but might be worth considering that you have an extra 1" there in case you have power issues. JMHO

Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
 
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