Replacement marine carb

[mattyboy]

Looking for a reliable plug and play 4bbl marine carb for the 5.0 the Holley has been nothing but a PITA
The Holley is a 4160 I think looking I guess for around a 600 cfm

Any suggestions

Thanks

[Pat McPherson]

Looking for a reliable plug and play 4bbl marine carb for the 5.0 the Holley has been nothing but a PITA
The Holley is a 4160 I think looking I guess for around a 600 cfm

Any suggestions

Thanks

I've had great luck with Edelbrock 600 on small blocks and 750 on big blocks. About $400 from any number of sources; bolt it on and go...

http://www.summitracing.com/search/p...retors/cfm/600

[John C in PA]

I've had great luck with Edelbrock 600 on small blocks and 750 on big blocks. About $400 from any number of sources; bolt it on and go...

http://www.summitracing.com/search/p...retors/cfm/600

Patrick, what is gained by putting a 4 bbl on a stock motor without doing the cam too? I ran the Summit Racing CFM Calculator which shows at 5,000 RPM from a 302 you flow 371.38 CFM (street) or 480.61 CFM (racing). "The ratings are different because street engines have a volumetric efficiency around 85% while racing engines are closer to 110%."

John C

[mattyboy]

I used the specs for a 69 HM 302 which is listed at 240 hp which is a 4 bbl carb setup. when i went over the motor build with the shop they said the carb should be a 600 like the 351

the 4160 comes in a 390, 450 and 600 cfm versions The block is an 87 5.0 which in stock form is 225 hp.
Not sure I understand a stock motor do you mean going from a 2 bbl to a 4 bbl means an intake first before the cam I used a weiand 4 bbl spread bore stealth high rise intake which is what it had on it on it when i got it just an older version
the motor runs well just have problems with the idle and low end rpm range it does bog for a second then takes off if trying to plane quickly but the mid range punch and top end the motors screams
Just looking for a carb that I am not always fiddling with

[John C in PA]

Matty, I was thinking of my 302 HO which came with the 500 CFM 2 bbl Holley. Some time ago I asked the Cobra guy at my shop about switching to a 4 bbl and he told me w/o replacing the cam the carb wouldn't get me much. Never had trouble with my carb. Knock wood.

John C

[joseph m. hahnl]

Edelbrock's are the so much easier to work on and the no leak float bowl is a bonus too.

Matty: Did you set your power valve with a vacuum gage? The wrong power valve can put your idle performance in the sea bucket

[tmdog]

Power valve is not part of the idle circuit and inactive at idle.

[Hooligan1]

Great choice, the Edelbrock carb is excellent. When a Holley starts to wear out, the shaft bushings are a big source for an air leak which makes it almost impossible to tune. Having that carb properly rebuilt can be very expensive. Sure you should match your carb to the cam but you should match all of your components together. It is much more important to match the carb to the intake and don't get too involved with the engineering and math behind the subject and don't base your knowledge on one mechanic, keep asking around. I've been at this for over 40 years now and I'm speaking from my own experience.

[Pat McPherson]

I thought Matt was done with the Holley and ready to replace?
My suggestion, based on past experience, both marine (chevy 350, 454, 502) and in a Mustangs (ford 289, 302, 347), was that Edelbrock Carbs are plug and play or closest to it anyway.
I'd buy a 600 Edelbrock Marine carb and a 1" 4 hole spacer/adapter to mate with the existing spread bore intake. That's me and it's not my $$, it's Matt's...

[woobs]

I used an Edelbrock 600 with my 4.3L V6 (237 HP) and a performer manifold. I had to add a calibration kit as the 6 is well, a six and not an eight. Nothing special for the cam ...just the stock grind from the 4.3 220hp EFI version. We set it up on the dyno and it works beautifully pulling to 5200. I have not touched it since that day (3 seasons). The power translated to real application perfectly and the boat jumps out of the water to plane with no bogs or flat spots. Highly recommended.
4.3 Dyno 05242013.JPGCam profile.JPGGreavette Sunflash IV July 2013 042.JPGSeaJ43.JPG

[mattyboy]

Had it rebuilt 2 seasons ago and have had to tune it several times with a gauge it is ok for a while then acts up

Sounds like the edelbrock is the way to go

[Donzi_Dude]

the edlbrock is the biggest turd you can put on a boat. if you must have one buy a 750 i will bet you $20 that it makes a min. of 10 HP over the 600 on your 302.

if you want to make 20HP buy this.

http://www.demoncarbs.com/5282010GC.asp

[Pat McPherson]

the edlbrock is the biggest turd you can put on a boat. if you must have one buy a 750 i will bet you $20 that it makes a min. of 10 HP over the 600 on your 302.

if you want to make 20HP buy this.

http://www.demoncarbs.com/5282010GC.asp

My bone stock 502 with the 750 Edlebrock will turn 5000rpm pushing my 22C to 73mph GPS... Then, throttle back and she idles at 600rpm... No issue! knock on wood


Now would the engine make a little more power with a finely tuned 800-850cfm Holley or Demon? Yupe, but...

[chip w]

Had it rebuilt 2 seasons ago and have had to tune it several times with a gauge it is ok for a while then acts up

Sounds like the edelbrock is the way to go

When I had the '69 with the 302 HM it had a Rochester 750 on it. It ran great on the top end but did the same as yours on the low end. My understanding was that the bogging was too much fuel at low end and it was flooding it out. I replaced it with a Holly 550 CFM and it was great at idle and hole shots. We wanted that as we used the boat for skiing, but I probably lost a little on the upper end. The smaller carb seemed to suit our needs. I did hear that after I sold the boat they had to rebuild the carb, typical for a Holly, but it was probably 5 to 7 years old by then. I haven't used the Edelbrock but I think that a 600 CFM would probably solve your problem.

[joseph m. hahnl]

Power valve is not part of the idle circuit and inactive at idle.

Oh but it is It's a huge part of the idle circuit when it opens prematurely . Hence the reason you need a vacuum gage at idle to put the correct vacuum opening. Not my first walk in the park with a Holly . Buy the Holly book you might learn something

Matty: I run an AFB Webber(Pre Edelbrock) 600 on the 350 cid and an Edelbrock 750 on the 400 cid. easy cleaning, easy meter jetting. now worries about float bowl gaskets leaking. all around a great carb. I think you'll be overjoyed with the trouble free performance they offer