Merc 420 spec's ??? What is it??
To match them yella motors you got in that there bote.
11-19-2002, 06:53 PM
#23
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Hey Crazyhorse! You forgot to mention that my "bote" is yella too!
blown formula----looks like I'm going to become a martyr again. But you don't have to throw me into the lion's den----just open the gate and I'll walk in.
blown formula----looks like I'm going to become a martyr again. But you don't have to throw me into the lion's den----just open the gate and I'll walk in.
11-19-2002, 08:37 PM
#24
Registered
Thread Starter
Ok, so here is the recipe per the thread:
assuming the engines have clean bores & pistons in spec=
454-420 base engines
hone cylinders or bore & repl pistons
Merc high rise manifolds
stock carbs...???
cam- Edlebrock torquer hydraulic roller 224-232
[email protected] .525-.550 lift
110-112 lobe sepearation (4" risers)
OR
cam-Comp Cams Extreme 4x4
223 int...234 exh .544 lift int/ .564 lift exh
111 lobe seperation
Springs- Torquer 2 ???
remove casting flashing on intakes (heads & intake), clean up the bowls, radius the turns, unshroud the valves (street port heads)
bore notch the cylinders
file to fit rings
Stainless Marine exhaust & thrull hulls 4"
Change ignition to Thunderbolt IV or V or aftermarket
does this cover it? Which cam would be best of the two?
I am after more all around use rather than absolute speed, but good usable 500hp (or more) would be nice if it is reliable!!
assuming the engines have clean bores & pistons in spec=
454-420 base engines
hone cylinders or bore & repl pistons
Merc high rise manifolds
stock carbs...???
cam- Edlebrock torquer hydraulic roller 224-232
[email protected] .525-.550 lift
110-112 lobe sepearation (4" risers)
OR
cam-Comp Cams Extreme 4x4
223 int...234 exh .544 lift int/ .564 lift exh
111 lobe seperation
Springs- Torquer 2 ???
remove casting flashing on intakes (heads & intake), clean up the bowls, radius the turns, unshroud the valves (street port heads)
bore notch the cylinders
file to fit rings
Stainless Marine exhaust & thrull hulls 4"
Change ignition to Thunderbolt IV or V or aftermarket
does this cover it? Which cam would be best of the two?
I am after more all around use rather than absolute speed, but good usable 500hp (or more) would be nice if it is reliable!!
11-19-2002, 09:53 PM
#25
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Join Date: Jan 2002
Location: south jersey
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blown,
i'm sure that cam would work well for you but that wasn't my recommendation. it was just an example and happens to be the one i use. that is the cam i like for my particular application because my boat is so heavy. there are lots of good cams to select from depending on your situation, what you will use the boat for like pulling skiiers or poker runs, rpm range, weight of the boat, etc.
my engines also came from the factory bore notched.
i'm sure that cam would work well for you but that wasn't my recommendation. it was just an example and happens to be the one i use. that is the cam i like for my particular application because my boat is so heavy. there are lots of good cams to select from depending on your situation, what you will use the boat for like pulling skiiers or poker runs, rpm range, weight of the boat, etc.
my engines also came from the factory bore notched.
11-19-2002, 09:54 PM
#26
Registered
Blown Formula,
I don't know what your budget is for rebuilding your engines, but I would definately go with the hydraulic roller cams. Perhaps Dennis Moore can help make the suggestion on a hydraulic roller cam for you.
Also, if you really want a kick in the pants, once you get the heads off from those engines, send them to "JimV" and have the wedges installed!
I don't know what your budget is for rebuilding your engines, but I would definately go with the hydraulic roller cams. Perhaps Dennis Moore can help make the suggestion on a hydraulic roller cam for you.
Also, if you really want a kick in the pants, once you get the heads off from those engines, send them to "JimV" and have the wedges installed!
11-19-2002, 10:07 PM
#27
Registered
The blocks/engines that come with the "factory bore notch" does help, but is still nothing like the extent of what can be done over and above the what the factory does. With the "factory bore notch" there is much more to be desired and is minimal at best. I've even seen this done from the factory on the old 396 blocks.
11-20-2002, 09:12 AM
#30
Registered
Blown Formula,
I have a GM High Performance roller cam 224/234 @ .050 with .527 & .544 lift with 110LSA. This cam has about 40 hours on it and is in perfect condition.
I had it in my 502 but have since done a number of other mods to the engine and have swapped to a bigger cam .
This is one of the cams that Dennis Moore mentions in his book.
Infact, I have a buddy that installed the same cam in a 454 Magnum and it really woke it up!
The version of the cam that I have has the fuel pump lobe on it.
The cam is machined for a GenVI motor but is easily adapted to a Gen IV or V by using a retainer plate that your block is already machined for and utilizing a Gen VI timing set.
The cam is just sitting on the shelf with the box collecting dust. If you are interested I would take $75 plus shipping for it, and in fact I would throw in a GenVI timing set with about 20hrs on it for another $20.
E-mail if you are interested: [email protected]
I have a GM High Performance roller cam 224/234 @ .050 with .527 & .544 lift with 110LSA. This cam has about 40 hours on it and is in perfect condition.
I had it in my 502 but have since done a number of other mods to the engine and have swapped to a bigger cam .
This is one of the cams that Dennis Moore mentions in his book.
Infact, I have a buddy that installed the same cam in a 454 Magnum and it really woke it up!
The version of the cam that I have has the fuel pump lobe on it.
The cam is machined for a GenVI motor but is easily adapted to a Gen IV or V by using a retainer plate that your block is already machined for and utilizing a Gen VI timing set.
The cam is just sitting on the shelf with the box collecting dust. If you are interested I would take $75 plus shipping for it, and in fact I would throw in a GenVI timing set with about 20hrs on it for another $20.
E-mail if you are interested: [email protected]
