General Category > Quadrajet Carb Talk and Tips

Is this qjet ok for 400hp 10.5:1 Chevy 350?

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Camaro350:
Hi, I am building an engine for my '70 Camaro. I am replacing a matching # 250hp 350 with a daily driver motor but want to stay with a Qjet carb. 

New engine specs: ~10.5:1 compression, 3.48 standard stroke, not sure about cam yet but probably an Isky Mega 221@0.050 lift, 108 LSA. Rear axle is 2.73, TH350 tranny.

The carb: http://www.smicarburetor.com/products/sfID1/28/sfID2/9/sfID3/32/productID/18

omaha:
yes that will work but don't be surprised if it needs some tuning

novadude:
Why not just find a good core and build one yourself using parts from Cliff?  This way you'll know what you have, and you can tailor it to your application.  As said above, any "out-of-the-box" carb you buy will likely be coming apart anyway.  Why not just start with a cheap core and DIY?

FWIW, a 10.5:1 355 with that cam won't need a ton of help except with the idle circuit.   I am running something similar (355, 9.6:1, 217/225 108 LSA roller), and my car idles great and runs well with a carb built close to Cliff's "recipe 1" specs (slightly larger idle down channel restriction).

Camaro350:
Thanks,  I ordered the book they sell here as well. I am open to build myself but I probably should have mentioned I live in Sweden, not easy to find used qjets over here that's already "in use". Enthusiasts who like to cruise are quite fond of qjets I believe.

So I figured that even though I get one ready 2 go, I'm probably gonna take it apart before use anyway.

omaha:
yes I think you might be ok with the carb the way it is. However, with the info in the book you should be able to get it "spot on" if you need to.  Might need some idle work but not much

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