Personally I'd rather run a Holley carb than a Horrey carb. While I don't have any experience with these carbs, I have run one of their chinese knock-offs of an Edelbrock Performer intake and was not impressed. It looked chintzy, had multiple sealing issues, bolt holes were all just a little off/crooked. After six months, I finally threw it in the recycling bin with the used Budweiser cans and bolted up a swap meet Edelbrock manifold.
I've never understood folks like this....Summit has an outstanding return policy...even if they won't give you a refund they'll give you credit.... That said while I cannot speak for the carb....I have bout some summit branded ignition parts....popped open the box and was staring at name brand (mallory) stuff....same with a cam for a beater mobile I was flipping...it ended up being a crane.
Bought the combo manifold and 600 cfm carb w/vac secondaries. Runs good, no issues yet and have run it at the track numerous times. Good luck.
Purchased a 780 cfm and air gap manifold for a 383 SBC 18 months ago. We had to change the jets (can't remember the number) and the accel pump to a 50cc for an off idle stumble. It is a very tunable carb and tech support from Summit was great. I haven't had a problem since.
And buying this shit is what's killing the people who paid the freight for R&D to build it to begin with. Dave
They are simply recastings of the Holley 4010 series which were introduced in the late eighties. Based on the Autolite 4100 series FoMoCo 4 barrels. Good operating carbs.
I have one and have not have any issues. they have alot of extras that the 4010 didn't have. I have also seen those intakes and would not recomend those to anyone.
Damn good street carbs, way ahead of their time. Same operating window as the Edelbrock AFB clones, head and shoulders better. And you arent taking anything away from holley, they dropped that design years ago. The market wasnt ready for it at the time, IMO.
Remember that Summit does not manufacture anything.The usually buy in volume from known manufactures at a discounted rate which enables them to sell at a lower price.As Salty said above I have ordered items with the Summit brand and was shipped name brand items.Based on my experience and their return policy I wouldn't be afraid to try one of their carbs.
I bought a rebuilt Q-jet from summit. Bolt on and go, no issues. Reasonable price, and Very Fast Shipping as well.
I have one of the original Holleys in this version. I heard that Holley sold the design so they aren't really a knock off but just manufactured by another company. I think its the best carb I have used in years for a street car.Its been on two different cars so far and I haven't done a thing to it.
My brother is running one on his 383 stroker, claims he got 6 more MPG and does as good as the Edelbrock he took off. Summit said if he didn't like the look or performance, drain the gas and send it back.
Even notice that there is always someone who will post negative about foreign made autoparts. They should look at the "made in" sticker on the computer they are posting from and the many other items they use everyday. I can't "hipocrit".
If I hadn't found a real nice 4100 core I would be running one of these for sure. Great design and very efficient.
The original shooter holes are WAY small in the old holley versions. Just drill them and test with a number drill set till the stumble goes away. Once you do that, they are a really good carb.
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