Flamingo 42

I'm replacing my stock mercruiser carberator as part of my engine upgrade, anyone have an opinion on what carb would work better the holley or the edelbrock. I dont want to be tuning or adjusting all the time, will be using the 750 cfm.

formula 382 sr-1

iTrader: (3)

Edelbrock are very easy but you do lose some Hp with them.

Griff

Holley or Sea Demon. Why are you stuck on 750cfm's???? What engines and how much HP????

ezstriper

I run both....not on the same boat...guess i should clear that up....performance holley....overall ease of tuning, economy I like the edelbrocks....Rob

powerqrudy

I was thinking of doing the same thing to my SBC. What size is the current Rochester that they come with on a SBC ?

And what do you do for the Fuel line as fas as hooking it up to the new carb ?

Knot 4 Me

Holley's quality is suspect lately. Buddy bought 2, 850's for a 454 buildup he did and both eventually wound up at Nickerson to get them right. Out of the box they were pretty much junk. I might lean towards Demon.

Griff

850's are too big for a 454 unless its turning 6000+rpms. I remember several threads where the 850's were difficult to tune as well.

I had an 800 on a 420hp hopped up 454 mag and it was a little too big.

Flamingo 42

I'm upgrading my 330 hp 454 with aluminum heads, rpm airgap intake , still researching the cam and .30 bore to clean everything up.

KAAMA

iTrader: (1)

I agree with Griff. If this tells you anything, I have used a Holley 830cfm carb with Annular Discharge when I had my original 540cid engines. We dyno'd my engines on Tom Earhart's dyno and he said in all the years of dyno testing he never saw a carb "follow" as well as it did on my engines---540cid, Dart PRO-1 heads, Ultradyne Hyd Roller cams, 8.2 comp ratio, Dart single plane intakes, full length tubular headers, made 630hp @5400rpm.

If I had a 454cid engine I would probably use a Holley 750cfm carb.

floatingphil

I have used the Holley 650 QJet replacement and it's great. It's a vac. spreadbore so it fits your manifold properly and the steel fuel line bolts up along with the arrestor. The throttle bracket needed some work on mine. Electric choke is nice for us northern guys that still boat in November


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