650 holley
Thread Starter
Safety Car
Joined: Jun 2013
Posts: 4,399
Likes: 793
650 holley
Hey can anyone out there tell me if a 650 holley would fit on a 69 350/300. wondered about clearing hood. Would also like to use the 350hp manifold or another hi rise. some feed back please.
Burning Brakes
Joined: Sep 2009
Posts: 1,124
Likes: 140
From: Western New York
Don't know how much I can help, but I run a Holley 650 DP on my '72 with a 350/4 speed. I use an Edelbrock Performer manifold and a Moroso drop base air cleaner. With all of that, I have about a 1/4" of clearance between the stock hood and the air cleaner stud which I have cut down to just a few threads for the nut to grab hold of. Not me but the one on the air cleaner!
Duane
Duane
Le Mans Master
Joined: Nov 2006
Posts: 7,215
Likes: 1
From: Orlando FL
Don't know how much I can help, but I run a Holley 650 DP on my '72 with a 350/4 speed. I use an Edelbrock Performer manifold and a Moroso drop base air cleaner. With all of that, I have about a 1/4" of clearance between the stock hood and the air cleaner stud which I have cut down to just a few threads for the nut to grab hold of. Not me but the one on the air cleaner!
Duane
Duane
just be careful, not sure how tall the intake you want to use really is. In the end you will need to be mindful of the clearance.I know this: Once you have pocked a hole in a vette hood with a breather stud because your math was just slightly off
you will be very mindful of clearance.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
If you're referring to the spread bore 650 cfm Holley Quadrajet replacement, then yes, it will fit with no issues. The 350/300 and 350/350 used the same spread bore Quadrajet intake manifold.
If you're referring to the square bore 650 double pumper, you will have to use an adapter to fit the carburetor to the manifold and this puts hood clearance as questionable. This assumes your reference point is the factory small block hood used from '68-'72.
I write "questionable" since some cars it's not an issue and some cars it just won't clear the base hood. No two C3s are precisely the same when it comes to body fit on the chassis and you run into those tight clearance issues where it does work on one car and not on another. So just because someone else says it worked for them, don't just get to dropping the hood without being double damn sure you have the clearance.
If you're contemplating a square bore intake, like the aluminum LT-1 or an aftermarket high rise, then it becomes very doubtful you will have the clearance. There is a reason Chevy used the big block hood on the LT-1 cars.
If you're referring to the square bore 650 double pumper, you will have to use an adapter to fit the carburetor to the manifold and this puts hood clearance as questionable. This assumes your reference point is the factory small block hood used from '68-'72.
I write "questionable" since some cars it's not an issue and some cars it just won't clear the base hood. No two C3s are precisely the same when it comes to body fit on the chassis and you run into those tight clearance issues where it does work on one car and not on another. So just because someone else says it worked for them, don't just get to dropping the hood without being double damn sure you have the clearance.
If you're contemplating a square bore intake, like the aluminum LT-1 or an aftermarket high rise, then it becomes very doubtful you will have the clearance. There is a reason Chevy used the big block hood on the LT-1 cars.
Le Mans Master
Joined: Oct 2010
Posts: 6,929
Likes: 842
From: melbourne florida
2023 C3 of the Year Finalist - Modified
on my 79 i have an r.p.m air gap a 1/2 in spacer a dropped base air cleaner with a 3" filter with no issue, while people say oh that manifold won't fit. so do the math and check , you might be surprised what will fit.
Instructor
Joined: Nov 2012
Posts: 219
Likes: 0
From: Irma Northern WI
Holley list 6210 is a direct bolt on. They are difficult to find it good shape though. It is a 650 spread bore double pump with the factory divorced choke set up. I think that they were available in vacuum secondary too but, I don't know that list number. I do think that the 350/300 and the 350/350 used the same intake manifold, but someone may dispute that.
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