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Just got a mercruiser 575hp

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Old 08-13-2010, 09:23 PM
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Default Just got a mercruiser 575hp

Just got one of the gen IV mercruiser 540ci 575hp engines and someone put a quadrajunk on it. What would be a good carb to use on this motor?
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Old 08-13-2010, 09:29 PM
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Originally Posted by SickSation View Post
Just got one of the gen IV mercruiser 540ci 575hp engines and someone put a quadrajunk on it. What would be a good carb to use on this motor?
I have a setup for you came off my 540 going with a whipple.

1050 ProSystem Carb custom built.
CNC Victor Intake 454R for Big Block std. deck.

http://www.offshoreonly.com/forums/s...t-housing.html

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Old 08-14-2010, 01:24 AM
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the gen 4 540 is a tall deck your post says you have a short deck intake, but he could use the carb and go with a single plane brodex intake by Gellners they take a oval one and match port it to sq port heads gives more tq and hp over sq port intake, thats what I am getting for my back up motor 509 going from 650hp to 700 with a carb/intake /cam change. in case the blower motor is to big
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Old 08-14-2010, 08:26 AM
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Just do it the simple way. Get an Edelbrock Victor 454R for about 250.00 from Summit. And then spend your money on a good roller cam.
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Old 08-14-2010, 08:43 AM
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Originally Posted by AIR TIME View Post
the gen 4 540 is a tall deck your post says you have a short deck intake, but he could use the carb and go with a single plane brodex intake by Gellners they take a oval one and match port it to sq port heads gives more tq and hp over sq port intake, thats what I am getting for my back up motor 509 going from 650hp to 700 with a carb/intake /cam change. in case the blower motor is to big
I dont see where it says tall block my intake is a 454R
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Old 08-14-2010, 01:27 PM
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Yes mine is a tall deck. I found a dominator 1050 for 200.00 from a friends dad. Sounds like a good deal...

What do you guys think?
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Old 08-14-2010, 01:29 PM
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Originally Posted by AIR TIME View Post
the gen 4 540 is a tall deck your post says you have a short deck intake, but he could use the carb and go with a single plane brodex intake by Gellners they take a oval one and match port it to sq port heads gives more tq and hp over sq port intake, thats what I am getting for my back up motor 509 going from 650hp to 700 with a carb/intake /cam change. in case the blower motor is to big

Nice. Yea the motor has Ls6 heads on it.. 6272990 i believe is the casting number.. These pretty descent heads?
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Old 08-16-2010, 09:52 PM
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Merc made a NA 575???
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Old 08-17-2010, 05:54 PM
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Sicksation,

The engine is the same basic platform as the Bulldog. The following is a spec sheet I posted on a previous thread. It is not verified, however, that the hard parts are to “mil-spec” as was the Bulldog.

541.9 CID
GM MK 4 tall deck (cast# 14044807)
Block clearance to accommodate 4.375” stroke
Siamese Bore, reinforced decks with blind head bolt holes.
Deck 10.2”
2 pc rear seal
Bore 4.44”
Stroke 4.375”
(With a factory recommended bore range 4.250’- 4.560” there is plenty of room for upgrades)
SCR 8.6:1
4340 Lunati crank
Piston is Wiseco (Merc part #)
Connecting rod is Manley +.400" / 6.535"
Dart Single Plane Intake Manifold

The major difference in the two is the camshaft. The Bulldog had a moderately mild HFT, while the 575 has a SFT, 256º/264º on a 108º+3º centerline, definitely not recommended for use with wet exhaust. As Ian stated, a roller would be your best choice here.
The 990 heads are the generic 320 rectangle port GM OEM offerings. In stock condition they will be your limiting factor.
The Dominator you purchased will work well if tuned correctly.
Bob
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Old 08-17-2010, 10:49 PM
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Originally Posted by rmbuilder View Post
Sicksation,

The engine is the same basic platform as the Bulldog. The following is a spec sheet I posted on a previous thread. It is not verified, however, that the hard parts are to “mil-spec” as was the Bulldog.

541.9 CID
GM MK 4 tall deck (cast# 14044807)
Block clearance to accommodate 4.375” stroke
Siamese Bore, reinforced decks with blind head bolt holes.
Deck 10.2”
2 pc rear seal
Bore 4.44”
Stroke 4.375”
(With a factory recommended bore range 4.250’- 4.560” there is plenty of room for upgrades)
SCR 8.6:1
4340 Lunati crank
Piston is Wiseco (Merc part #)
Connecting rod is Manley +.400" / 6.535"
Dart Single Plane Intake Manifold

The major difference in the two is the camshaft. The Bulldog had a moderately mild HFT, while the 575 has a SFT, 256º/264º on a 108º+3º centerline, definitely not recommended for use with wet exhaust. As Ian stated, a roller would be your best choice here.
The 990 heads are the generic 320 rectangle port GM OEM offerings. In stock condition they will be your limiting factor.
The Dominator you purchased will work well if tuned correctly.
Bob
Thanks man. I was told it had carrillo rods and a crowler crank. The only thing i have verified is that it has gold crane rockers. Excuse my ignorance, but why would i not be able to use wet exhaust? Sorry man, my knowledge is limited..
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