heads? cam? small block stroker build
#11
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Thanks for the info so far. I bought this boat and it has been kinda a nightmare so far but I like to work on things. Blew the lower first time I drove it. Rebuilt it and blew the motor second time I drove it LOL and I was taking it easy. Block had a hole in it the size of my fist but I was able to limp it back to the dock it was crazy seeing the engine run with a piston laying in the bilige. So I was thinking I have a 4 bolt bare block laying around. I was givin a set off Eddie marine small block exhaust. I also have edlebrok rpm manifold and Carb not sure what size Carb tho. Don't know how to identify. Also have a Mallory marine distributed and box. So that's where I am at. I figured since I need to build a motor might as well stroke it and the biggest kit I found all forged h beams and stuff 409. For 1399.00 it may be over kill but that's ok. Previous 48 MPH with a stainless 19 would be overjoyed to hit 60 can I do it with this build and more pitch. I got lots of nitrous laying around too if temptation persists
#12
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Thanks for the info so far. I bought this boat and it has been kinda a nightmare so far but I like to work on things. Blew the lower first time I drove it. Rebuilt it and blew the motor second time I drove it LOL and I was taking it easy. Block had a hole in it the size of my fist but I was able to limp it back to the dock it was crazy seeing the engine run with a piston laying in the bilige. So I was thinking I have a 4 bolt bare block laying around. I was givin a set off Eddie marine small block exhaust. I also have edlebrok rpm manifold and Carb not sure what size Carb tho. Don't know how to identify. Also have a Mallory marine distributed and box. So that's where I am at. I figured since I need to build a motor might as well stroke it and the biggest kit I found all forged h beams and stuff 409. For 1399.00 it may be over kill but that's ok. Previous 48 MPH with a stainless 19 would be overjoyed to hit 60 can I do it with this build and more pitch. I got lots of nitrous laying around too if temptation persists
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I'm all about more hp, thats a lot of boat for an alpha drive though. You start throwing more power to it and it won't last long. Rebuild it with what you have and leave it alone.
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Thanks for the info so far. I bought this boat and it has been kinda a nightmare so far but I like to work on things. Blew the lower first time I drove it. Rebuilt it and blew the motor second time I drove it LOL and I was taking it easy. Block had a hole in it the size of my fist but I was able to limp it back to the dock it was crazy seeing the engine run with a piston laying in the bilige. So I was thinking I have a 4 bolt bare block laying around. I was givin a set off Eddie marine small block exhaust. I also have edlebrok rpm manifold and Carb not sure what size Carb tho. Don't know how to identify. Also have a Mallory marine distributed and box. So that's where I am at. I figured since I need to build a motor might as well stroke it and the biggest kit I found all forged h beams and stuff 409. For 1399.00 it may be over kill but that's ok. Previous 48 MPH with a stainless 19 would be overjoyed to hit 60 can I do it with this build and more pitch. I got lots of nitrous laying around too if temptation persists
You dont need forged stuff with the beans you will be putting out. Trust me just do a good balance on some good cast stuff.
If you block is useable, you should have the dough for a mellow 400HP set up at least high 3's.
You have the exhaust, all the marine stuff from your old setup
The merc stock ignition is fine.
you have a manifold
You may want a real carb, or to just tube up the one you have, Id go with a real carb here.
you are proposing a lot of work for a marginal platform and I understand why the guys are telling you to just stand down and fix what youve got- I get it, but there are times when you just cant and I get that as well.
UD
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Do a search for "Reversion" you will need performance exhaust. To get 1HP per CI you will need a roller cam, a flat tappet just will not get it in the marine world. Here is what I would do. Sell the Alpha drive in the swap shop and buy a Bravo setup. Build a 502 or a 489/496 stroker engine. Or sell the boat and buy one with a 454 or 502 that already runs 60MPH. My boat came with a stock 330 454CI and ran 55MPH on GPS. After thousands of dollars worth of upgrades and hundreds of my labor hours I have the boat running 74GPS. All of the upgrades were done over a period of years and I broke many parts until I figured out what I was doing. Good luck with your project!!
#17
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Do a search for "Reversion" you will need performance exhaust. To get 1HP per CI you will need a roller cam, a flat tappet just will not get it in the marine world. Here is what I would do. Sell the Alpha drive in the swap shop and buy a Bravo setup. Build a 502 or a 489/496 stroker engine. Or sell the boat and buy one with a 454 or 502 that already runs 60MPH. My boat came with a stock 330 454CI and ran 55MPH on GPS. After thousands of dollars worth of upgrades and hundreds of my labor hours I have the boat running 74GPS. All of the upgrades were done over a period of years and I broke many parts until I figured out what I was doing. Good luck with your project!!
Agreed on reversion, Ive built many of these combos as well
The reversion problem is why I said "use great caution" in selecting a camshaft 8 posts ago.
The poster has an EMI exhaust, these are not too bad.
Reversion is a big problem trying to get to high HP using an automotive formula of high lift and valve overlap.
Heres my latest marine small block build.
Its a 500/500 engine.
http://www.offshoreonly.com/forums/d...ent-years.html
This is my 5th small block config in 20 years. The last one lasted 10, and the 4 before that 10 combined years. I think im on a pretty good formula after all this time and money.
I finished this one a week ago and its going into the boat either next week or the week after.
I agree its a pain to get a small block to high HP levels, and if I were him Id start over with a different project.
-but he seems pretty determined.
Uncle Dave
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Agreed on reversion, Ive built many of these combos as well
The reversion problem is why I said "use great caution" in selecting a camshaft 8 posts ago.
The poster has an EMI exhaust, these are not too bad.
Reversion is a big problem trying to get to high HP using an automotive formula of high lift and valve overlap.
Heres my latest marine small block build.
Its a 500/500 engine.
http://www.offshoreonly.com/forums/d...ent-years.html
This is my 5th small block config in 20 years. The last one lasted 10, and the 4 before that 10 combined years. I think im on a pretty good formula after all this time and money.
I finished this one a week ago and its going into the boat either next week or the week after.
I agree its a pain to get a small block to high HP levels, and if I were him Id start over with a different project.
-but he seems pretty determined.
Uncle Dave
The reversion problem is why I said "use great caution" in selecting a camshaft 8 posts ago.
The poster has an EMI exhaust, these are not too bad.
Reversion is a big problem trying to get to high HP using an automotive formula of high lift and valve overlap.
Heres my latest marine small block build.
Its a 500/500 engine.
http://www.offshoreonly.com/forums/d...ent-years.html
This is my 5th small block config in 20 years. The last one lasted 10, and the 4 before that 10 combined years. I think im on a pretty good formula after all this time and money.
I finished this one a week ago and its going into the boat either next week or the week after.
I agree its a pain to get a small block to high HP levels, and if I were him Id start over with a different project.
-but he seems pretty determined.
Uncle Dave
I used RMbuilder for my cam and I am sure he could easily get him 400HP.
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