When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Anyone out there with an LT1 running any other carburetor than the Holly 770? had mine rebuilt just doesnt run right. thinking about a 650, any thoughts out there?
I was using a Holley Street Street Avenger 670 cfm until it started leaking fuel and caught fire. Turned out to be loose float adjustment. Fuel leaked out, puddled up on intake and poof! It ran great and I was very happy with it until this. I would still buy another one though...
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
Not an LT-1 but I'm running a Holley 650 with mechanical secondaries on my 427/390 and it pulls great. Seems to be plenty of carb right up through 5,500 RPM's. Nice low and mid range torque. If you're worried about it not being enough carb, I think you will be OK. I talked with Holley tech before I put mine on. If you don't live over 6,000 RPM's you will be fine and may realize superior volumetric efficiency throughout the low to mid RPM range.
I was using a Holley Street Street Avenger 670 cfm until it started leaking fuel and caught fire. Turned out to be loose float adjustment. Fuel leaked out, puddled up on intake and poof! It ran great and I was very happy with it until this. I would still buy another one though...
OHHHH! I see you had those Junk Moroso clear float bowl screws. I had one crack and fail on me years ago, luckily I was 2 blocks from home when it started to leak fuel onto my motor. I run with the factory brass screws now and throw away any I find on carbs I rebuild.
Yeah, I bought the car that way. Sad part is I only owned the vette for 2 months...then the fire. Now I am doing a complete frame-off resto. Hope to have it back on its wheels by the end of the summer!
Thanks, the car is 100% stock, I think I might just have it rebuilt again. its hard starting, it floods, let it sit for about 10 minutes and it starts right up, runs great until I shut it off, then restart, it wont idle? I think its possessed!