Technical > Spud Miller's Cave

Engine won't run right with zoomie headers

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DiggerDon:
I have a 18 degree 428 engine in my fed 14 to1 comp ratio 950cfm gas carburetor that I had built for a dirt track car. Never used engine in dirt car, (sold dirt car with old engine) built my fed with the new engine. Made zoomie headers and ran rough would not idle right, I made collector headers and it runs great.
Would like to put zoomies on car to look original. Seems like I have vacuum problems .
What can I do to fix the problem. Thanks Don

crider:
I just went thru this very same thing on my BBC, try making you zoomies longer. It took care of my idle issues. Engine was acting like it had a massive vacuum leak and wouldn't idle, added some length to the pipes and it cleared right up

jspell:
I went through this last year with my 423" SBC with 18* heads etc...ran great on dyno...would not run with the zoomies...14:1 comp and big cam...I put collector headers back on it...runs great.

Rusty Kramer:
I wanted to put Zoomies on a naturally aspirated   engine many years ago and I was advised not to because they do not make enough back pressure for an N/A application and you will lose a lot of low end power. 

wideopen231:
Have run zoomies for years on NA motors with no real issue.As to power loss .I think its mostly bottomend power and I lleave at 5000 with 6600 stall converter so who cares about bottom end power.I run mostly in a 1500 to 1800 rpm range 6600 thru 8400 maybe cpl more in 1/4.

Zoomies seems to always be fine with injection and take some tunning if running one of those craparators.

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