persuaderkurt
Member
Where do you get a crat 383 450hp for under $5k. Walmart?
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Mercruiser 5.7 260hp
- Thread starter cvx16cvx
- Start date
SneakyPete
Member
Check Scoggin Dicky, you can buy a set of their high lift iron vortec heads with an edelbrock air-gap intake for $1,009. The heads can handle up tp .525 of cam lift. http://www.sdpc2000.com/catalog/2172/SDPC-Vortec-Cylind...ds-and-Head-Kits.htm
Check either high performance chevy magazine, hot rod, or car craft as they did a vortec head build up and got 400 something horse for cheap money.
Vortec heads are great bang for the buck, I am going to go that route if my 2 bolt main targetmaster ever lets go.
Check either high performance chevy magazine, hot rod, or car craft as they did a vortec head build up and got 400 something horse for cheap money.
Vortec heads are great bang for the buck, I am going to go that route if my 2 bolt main targetmaster ever lets go.
SneakyPete
Member
440 Budget Vortec Build - I know its a car engine, but it can give you ideas for the top end
http://www.carcraft.com/techarticles/81998/index.html
http://www.carcraft.com/techarticles/81998/index.html
bakedgoods222
Member
Check With Davison's Metro Power Center In Michigan they have long blocks of all sizes crazy cheap!! 1-(866)-593-8100
persuaderkurt
Member
bakedgoods222 thanks for the info. I have a 5.7LX carbed and have been thinking of putting on a procharger. After all is said and done I am estimating the cost to be around $5k. $3.7 for procharger plus a new carb and prop should put me close to $5k. I will have to give Davison's a call. Maybe a new engine would be a better option. I can always sell mine to offset the cost of a new one.
I have always been very happy with my engine....just would like a few more ponies.
cvx16cvx...
You can get some big HP numbers out of s mall block Chevy! Just for giggles, I had an "A-Class" Eliminator 23' cat offshore running a Merc speedmaster III and a very stout (nascar grade) 355ci small block on pump gas (93 octane) turning 108+mph for hours!
If you can scare up a newer style Vortec 350 or 383 from a competition ski-boat (300-340hp range), it is an EASY bolt-in and BIG difference for your performance goals (plus it's going to be reliable)!
If you decide to build your own, make sure its being built to MARINE SPECS with the highest quality parts (correct VALVES, PISTONS, RINGS, BEARINGS and SET-UP-SPECS are an absolute must)! Go to Amazon.com and order the book on "Building a Marine Performance Small Block Chevy"... I think it's by Peterson Publishing or S&A books? It has EVERYTHING you need to know for under $20.
You can get some big HP numbers out of s mall block Chevy! Just for giggles, I had an "A-Class" Eliminator 23' cat offshore running a Merc speedmaster III and a very stout (nascar grade) 355ci small block on pump gas (93 octane) turning 108+mph for hours!
If you can scare up a newer style Vortec 350 or 383 from a competition ski-boat (300-340hp range), it is an EASY bolt-in and BIG difference for your performance goals (plus it's going to be reliable)!
If you decide to build your own, make sure its being built to MARINE SPECS with the highest quality parts (correct VALVES, PISTONS, RINGS, BEARINGS and SET-UP-SPECS are an absolute must)! Go to Amazon.com and order the book on "Building a Marine Performance Small Block Chevy"... I think it's by Peterson Publishing or S&A books? It has EVERYTHING you need to know for under $20.
Okay Well I am getting some great thoughts! The ski boat motor deal is the cheapest but i believe they dont run over 5000rpm.
Did I mention my goal is to beat my buddy.
He is running a 1971 Tahiti 18ft flat bottom with a 455 Olds Torker intake MSD set up with a berkley jet drive and a jetovater trim. It kills me that he is just a little faster....
In any kind of chop, lake chop that is.., I crush him. Well the engine is coming out onto a stand this week so please keep up the suggestions..Thanks Chris
Did I mention my goal is to beat my buddy.
He is running a 1971 Tahiti 18ft flat bottom with a 455 Olds Torker intake MSD set up with a berkley jet drive and a jetovater trim. It kills me that he is just a little faster....
In any kind of chop, lake chop that is.., I crush him. Well the engine is coming out onto a stand this week so please keep up the suggestions..Thanks Chris
Chris... The ski boat motors are very stout and they have tons of torque... just what you need to turn that bigger prop!
Get yours out and look at it... You should be considering something fairly "heavy duty"... like 4-bolt mains, steel crank, good rods and rod bolts, good pistons, really good valves, etc. Some of the merc stuff is nice, some is just your basic truck 350. Put together someting strong, and again, to MARINE SPEC's! Some of the old HOT-ROD stuff works, but not always in a marine application... Jim.
Get yours out and look at it... You should be considering something fairly "heavy duty"... like 4-bolt mains, steel crank, good rods and rod bolts, good pistons, really good valves, etc. Some of the merc stuff is nice, some is just your basic truck 350. Put together someting strong, and again, to MARINE SPEC's! Some of the old HOT-ROD stuff works, but not always in a marine application... Jim.
CheckmateFever
Well-known member
I would love to upgrade my engine some day too. I like the ski-boat engine idea, where do you find them?? About how much are the going for?
Cvx, i'm looking foward to seeing what kinda results you get, it'll give me a good idea of what to do with mine eventually!!
Cvx, i'm looking foward to seeing what kinda results you get, it'll give me a good idea of what to do with mine eventually!!
FYI guys... Want a quick 50+HP on your 260 merc for under $2000?
Performer RPM intake
Holley 750 marine carb
Competition Cam MARINE GRIND hyd. cam (comp kit)
Stainless marine performance small block manifolds & risers
Stock heads, stock shortblock, stock ignition. We did a "bolt-on build" to a 250 hour Merc 260 and pulled 315hp @ 5000 rpm on the dyno.
Performer RPM intake
Holley 750 marine carb
Competition Cam MARINE GRIND hyd. cam (comp kit)
Stainless marine performance small block manifolds & risers
Stock heads, stock shortblock, stock ignition. We did a "bolt-on build" to a 250 hour Merc 260 and pulled 315hp @ 5000 rpm on the dyno.
Chris E
Well-known member
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by vinny p.:
The term "long block" refers to an incomplete engine that consists of only the block, heads and internal components. Sometimes it can come with the "tin", which means oil pan, timing and valve covers. </div></BLOCKQUOTE>
If your talking a Mercruiser engine, from the factory, their idea of a long block includes everything but ignition, fuel and exhaust manifolds - just to make things more confusing.
The term "long block" refers to an incomplete engine that consists of only the block, heads and internal components. Sometimes it can come with the "tin", which means oil pan, timing and valve covers. </div></BLOCKQUOTE>
If your talking a Mercruiser engine, from the factory, their idea of a long block includes everything but ignition, fuel and exhaust manifolds - just to make things more confusing.
happy...
most of the new motors (vortec's) are hydrolic roller cams. They make tons more torque and very durable compared to the old standard flat-tappet ones. Sounds like your engine guy is too "old-school" or doesn't know enough at building a MARINE motor??? You don't have to build a "NASCAR" motor to turn 5500rpm!
Again, building a STOUT HEAVY DUTY motor is the same for performance whether in a car, truck, or boat... The marine motors are usually set up to a different set of specs to deal with the continuous full-load running & internal heat for long periods of time... That's why correct severe-duty VALVES are a must, along with proper piston & ring clearences, heavy duty bearings, using good oil & oiling system, etc.
most of the new motors (vortec's) are hydrolic roller cams. They make tons more torque and very durable compared to the old standard flat-tappet ones. Sounds like your engine guy is too "old-school" or doesn't know enough at building a MARINE motor??? You don't have to build a "NASCAR" motor to turn 5500rpm!
Again, building a STOUT HEAVY DUTY motor is the same for performance whether in a car, truck, or boat... The marine motors are usually set up to a different set of specs to deal with the continuous full-load running & internal heat for long periods of time... That's why correct severe-duty VALVES are a must, along with proper piston & ring clearences, heavy duty bearings, using good oil & oiling system, etc.
SneakyPete
Member
Is there machine-work required to put a hydraulic cam into a flat tappet motor? I thought it was just a matter of changing the cam, lifters, and pushrods...
There are KITS for everything...
A flat-tappet referes to the cam & lifter design. The bottom of the lifter is "flat" and basically glides around the cam lobe. It can have either solid or hydrolic lifters (can is cut differently for type of lifter).
A roller cam set-up uses a lifter with a roller-bearing on the bottom and a special cam designed to have that roller on it. The advantage is less friction and more radical cam profiles to boost torque or horsepower. Sometimes they also require special valve springs and pushrods depending on the use and application. Roller lifters can be solid or hydrolic as well, and the roller can is designed for type of roller being used.
Hope that helps... Roller is a bit more expensive, but worth the effort! Sometimes you can use later-model factory "roller motor" parts at a good price! Jim.
A flat-tappet referes to the cam & lifter design. The bottom of the lifter is "flat" and basically glides around the cam lobe. It can have either solid or hydrolic lifters (can is cut differently for type of lifter).
A roller cam set-up uses a lifter with a roller-bearing on the bottom and a special cam designed to have that roller on it. The advantage is less friction and more radical cam profiles to boost torque or horsepower. Sometimes they also require special valve springs and pushrods depending on the use and application. Roller lifters can be solid or hydrolic as well, and the roller can is designed for type of roller being used.
Hope that helps... Roller is a bit more expensive, but worth the effort! Sometimes you can use later-model factory "roller motor" parts at a good price! Jim.
happy
Active member
ok.. j.. show me 1 flat tappet small block chevy series engine thats in a boat that runns reliable 5500 rpm all day long.. now make it affordable.. aint happening.. the all day long 502's 500's 525's spinning 5200.. a dragster runs up high rpms and they gotta go thru them (engines) all the time.
<<< an no j.. aint old school.. just trying to get people up to speed.. i hate people spending money on bad ideas.. and a small block running 5500 rpm all day long.. is wrong.. the approach to the whole idea of getting more speed needs to be addressed differntly in this situation. thats all..
there is new stuff out there that will get him the speed he wants.. and ultimatly.. at less cost.. but thats not what he wants to hear.. so
there it be..
and my machinist says... c'mon... meet us in the keys this time next year.. then we'll speak.
<<< an no j.. aint old school.. just trying to get people up to speed.. i hate people spending money on bad ideas.. and a small block running 5500 rpm all day long.. is wrong.. the approach to the whole idea of getting more speed needs to be addressed differntly in this situation. thats all..
there is new stuff out there that will get him the speed he wants.. and ultimatly.. at less cost.. but thats not what he wants to hear.. so
there it be..
and my machinist says... c'mon... meet us in the keys this time next year.. then we'll speak.
WHOA! Okay stop the bickering..I just want to go fast as cheaply as possible..Was thinking of doing a 383 kit to my Merc 5.7 260hp..I have not thought of running the Enchanter on the NASCAR circuit..I just want reliable HP with a higher rpm than 4800...
Yes I have seen automotive crate 383 motors for $3k..There is a dozen of them on EBay.
I might just go thru my engine and stroke it it go with Dart heads and make it a roller set up..Whew!
Yes I have seen automotive crate 383 motors for $3k..There is a dozen of them on EBay.
I might just go thru my engine and stroke it it go with Dart heads and make it a roller set up..Whew!
happy
Active member
now your talking... up grade your crank to steel, roller set up on the top half.. nice carb, and exhaust.. you'll be doing fine.. and remember this.. horsepower is to prop diameter, as torque is to pitch.. thus you can utilize your horsepower to swing a larger diameter prop.. and increase your pitch for your increased torque.... what you'll find is you don't need to run 5500 rpm...
ps... nascar isn't running 20 yr old chevys.. heheheh my point was to make it spin that high all day long is expensive and crazy.. he's on the right track now stroke it and put some good stuff on the lower half to handle whatever upgrades he wants.. <<< at the keys.. got work to do.. go luck with your project...
ps... nascar isn't running 20 yr old chevys.. heheheh my point was to make it spin that high all day long is expensive and crazy.. he's on the right track now stroke it and put some good stuff on the lower half to handle whatever upgrades he wants.. <<< at the keys.. got work to do.. go luck with your project...