I was given an almost new Holley Street Avenger 770 that was rejeted to 670 with a new blow out valve. I downloaded the intruction manual and noticed there is a fitting for a power brake hose. I thought I had to run my vacumn from my disc conversion to the intake. However, does this mean I can run it to my carb?

Sorry for the dumb question.

i ran mine to my intake ... i have tje 670 also..i heard it doesnt matter same amount of positive vaccum

it also looks claner at the back of the manifold rather than all the way to the front of the carb

It can be used for the vacuum booster or the PCV hose that runs to the driver side valve cover and pcv valve. Really just depends on how close to factory you are routing your hoses. A lot of after market manifolds are not tapped for vacuum these days so if you have the manifold port you have a choice.

Changing jets dose not change the cfm of the carb if it is a 770 then it will stay a 770.

What motor are you using this for? I ask b/c I have it on my 396 and it was dangerously lean STOCK!

I will have to ask the guy I got it from what he met by rejeting, the carb was almost new.

I am putting it on a 383 stroker, I do have an older 650 (I think) I could run.

My father rebuilt the motor but passed away before we completed the restoration. Unfortantly, I didn't get a lot of information on what he did.

I know the rotating assembly is balanced and blueprinted including the flywheel. Camel hump heads (64-66 chevy polished and ported), not sure if they are the big valves or medium. Roller rockers. Dynomax headers and a high rise Edelbrock performer intake.

What I don't know is the cam specs.

It is slowly coming back together. We put the motor in the subframe this weekend and hope to have it bolted back to the car at the beginning of January.

http://community.webshots.com/user/jhilts71

If it is truely a 770 i would go with the 650. This is going to be a street car so you want good drivablity and the 650 will be better then the 770.

I was running a 780 on my 383 and switched to a 670 avenger and there is very little difference. The 670 throttle seems just a tad more responsive. Both are vac sec carbs as is the 770 and with the right sec diaphram spring the sec's won't open any more than needed. I tend to agree with running a smaller carb but the 770 won't be out of place on the 383...

My guess is the guy put the same jetting in the 770 as comes factory in a 670.

My dad actually had the smaller carb on the motor. He was debating about user the 770, but I thought he kept the 770 for his self because it was newer. I had asked him to build a motor that was dependable with a little pep, so maybe we was thinking the 650 would have a little more drivability. I am not sure.

I will get the numbers off the smaller one and find out more information.

I think I will also call Jegs and see if they can tell me what cam I ordered.

I believe the other carb is a 750. 80508-1 was the number on the carb.

My cam was a Comp Cam with 454 lift, 268 Duration.

.194 valves with 62 CC heads

Rotating Assembly from Ohio Crank

Hypereutectuc TRW flat top pistons