Reply With QuoteSorry for the large photos... I thought they would've been resized when posting.. I was wrong... :hammer2:
I felt it was time to tune up my carb with a jiffy kit/carb kit to make ensure a trouble free season coming up. I went on to Jegs to try to find a kit for my Holley carb but after looking around I'm not sure what carburator I have. I know that it's a 4 barrel with mechanical secondarys, I've had the carb as long as I've had my boat, about 15 years.. The boat runs strong and clean, I just want to rebuild the carb as it's getting a bit on the crusty side (as you can see). I've always thought it was 750 cfm but I'm not sure...
Numbers that are on the carburator:
Holley
6R 7075 B
E9JL-EA (motorcraft choke)ele.
List 50470
2731
12R-4608B
Photos:
http://img.photobucket.com/albums/v2...e/Danny002.jpg
http://img.photobucket.com/albums/v2...e/Danny003.jpg
http://img.photobucket.com/albums/v2...e/Danny004.jpg
Thanks for your help...
Dan
Sorry for the large photos... I thought they would've been resized when posting.. I was wrong... :hammer2:
Dan,
That is a pretty old one and the Holley "list #" index no longer shows it.
I do believe that it is a Model 4160, 650 CFM, Vacuum Secondaries,
Marinized Carburetor. It was a popular carb for the 460's and other
stock motor packages. Volvo used the later version for their early
90's carbed big-block chevys.
I would imagine that a kit for a 4160 Series kit would work. Just be
sure and compare the parts and gaskets in the kit package the best
you can before you remove the plastic seal.
You also might call the "Carb Shop" in Ontario. They used to have
a lot of parts for obsolete units, or can direct you to a cross reference.
Brad Urban used to own it, I think Bob Vrbanic now has it.
1461 E. Philadelphia, Ontario, CA 91761
Phone: (909) 947-3575 Fax: (909) 947-7495
Good luck.
Definately a 4160 with the single metering block and vacuum secondaries.
Summit ( www.summitracing.com ) has the Holley Quick Kit for $19.95. Part# HLY-37-1542.
http://store.summitracing.com/defaul...h.asp&x=32&y=9
BTW...
Is it just me, or is your transfer tube just kinda hangin' loose there in the first pic? Hope it wasn't like that when you pulled it out! :jawdrop:
Oldrat and Flip, Thanks for the confirmation on the model... Yes Flip I took one of the bowls off just to lurk around, the transfer tube was loose inside both fittings, good eye...
Now that It's a 650 I'm a little bummed.. I've been reading here that even a mild 460 could take to a 750 with no problem, and... It seems like most of you agree that mechanical secondarys are the way go over the vacuum units.. Do you guys think I can gain any performance by replacing my old 650 with a newer Holly 750? Or should I just keep the old crusty 650 going?
Thanks...
Dan
After all those years, you might consider a new carb. Look at
internal surfaces and especially the metering block in the
front for pitting and corrosion which can affect how the carb
flows fuel, etc. Also, sometime the base plates and other
surfaces warp and do not seal good. Also, get some of the new
bowl & metering plate gaskets that do not stick and seal better.
Since you said the carb was working OK, I would just clean it
out and kit it and use it until you determine what you want to
do. You may be able to find a nice used 750 double pumper
somewhere that you can try. Although, I am sometimes hesitant
about buying used carbs.....you never know what someone has
done to them. A larger carb should give you a little more in
the midrange and top end, but on stock motors the size increase
or performance gain is not quite as noticeable. You also may have
to fiddle with the power valve ranges on a larger carb depending
on your cam.
I have also had good luck out of the box with the Barry Grant
Demon Series marine carbs. It takes very little to get these
tuned to a specific application.
OR
Oldrat and Flip, Thanks for the confirmation on the model... Yes Flip I took one of the bowls off just to lurk around, the transfer tube was loose inside both fittings, good eye...
Now that It's a 650 I'm a little bummed.. I've been reading here that even a mild 460 could take to a 750 with no problem, and... It seems like most of you agree that mechanical secondarys are the way go over the vacuum units.. Do you guys think I can gain any performance by replacing my old 650 with a newer Holly 750? Or should I just keep the old crusty 650 going?
Thanks...
Dan
Oh ok, looking back at that first pic I see the bowls are loose too!It just kinda weirded me out seeing that tube just hangin there.
Performance-wise, I would guess that you would see a quite a bit of jump in power and RPM going from the 650 to 750. The 650 is probably not flowing nearly what that big 460 could burn. I saw somewhere on here recently that some people think that the 460 likes even bigger carbs. Some were going as far as to say you couldn't over carb those motors. I dunno, I'm not expert. That being said..... I've got a real clean 850 for sale if you want it.
Just remember to keep you gas mileage in mind when selecting your next carb if you do decide to move up in cfm. Who knows? Maybe switching up will keep you out of the secondaries on that 650? Maybe you'll like the power so much you won't be able to stay out of them with the bigger carb?
I'm not trying to discourage any sales here or talk you out of upgrading, but I have already been down this road with my 460 from stock (same carb you have and SCJ iron intake) to an 800 DP and a Stealth intake, the result was about nil, both were tuned well, both pull about 4900 rpm's. Unless you plan on upgrading exhaust and perhaps a more aggressive cam, I'd guess you'll see very little if any real change.
Save yourself alot of headaches and use a "Holley" kit. Jiffy kits work well on old carters/rochesters etc. But buy the Holley kit for your holley, you'll be glad you did...........MP
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