About what hp should I have with this set up???

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

A stock 600cfm carb will not feed a 300hp + motor,

If it is a marine q-jet, it would be unusual if it was only 600cfm. I think even the ones they put on the 4.3ls were 750's. It's vac sec, so its not over carbed.

Without checking casting numbers, static compression will be about 10:1. On the high side for a boat, but higher octane, timing adjustments, and not having a heavy boat, will help.

Moving from mech to elec fuel pump, not sure why he would do that. It will need to wired correctly in a boat, so its not pumping fuel after engine stalls.

Cam has potential to suck some water. Will want to check plugs regularly after idling.

If intake is the low profile, look for the GM cast-iron high-rise dual plane (like what the Merc 350 MAG had), or if fresh water, many after market options.

Offhand, would say the engine builder built a mild perf car engine. Outside of the intake, if you are going to push the builder for more HP, consider slightly moded vortec heads or equivelents. Vortecs will require a different intake than what I stated above, though.

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Rapidomarine I thought only built marine I thought he would do what I wanted but.guess not..

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

this carb should be fine here and it is the stock carb here is a sight to tell you http://www.4secondsflat.com/Carb_CFM_Calculator.html

 

[haulnazz15]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

If this is a Rapido Marine engine, then I'll bet it was built properly.

 

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Rapidomarine I thought only built marine I thought he would do what I wanted but.guess not..

Ok, I interpreted your first post as you having the engine rebuilt that was in the boat. A reman can have just about anything, and you would want to verify casting/part numbers. or did you buy short block and use your own heads and intake?

If you are staying with what you have, a 600-650 cfm is ok. My point is, if it was a q-jet with that size, it is more than likely a car carb, or one that has been converted. I'd still bet that it a 750 if it is a q-jet. If they only said a 600cfm carb, you probably get a Holley or Edelbrock.

I have no personel experience with rapido, but searching here will find allot of comments posted by those that have. Positive and negative expierences. If I remember correctly, there was someone that received a 350 from them that had 305 heads, so you should check those casting numbers, under the valve covers. I think they were good about replacing them, though.

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Ok I thank everyone for there feed back.The Heads are the 193 casting number, dont know if they came on a 305. The engine I got it a long block from Rapido I ask him " RAUL" to build me a 350 hp engine he ask my outdrive told him it was an ALPHA1 he said it wont handle that I said ok build me a 320 hp. he said with a cam and spring upgrade and it being bore 30 over I should be 300 to 320 hp then I told him I wanted flat top pistons. I have no idea how he can say I am going to get this for sure without a dyno. So I was hoping for some feed back and now I am hearing about water ingestion, and that I will be around 280 HP. Raul seems very short with people. So i want more input I did pay extra and want to make sure I am getting what I paid for.

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Also the carb has a mercruiser metal tag on it.

 

[FreeBeeTony]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

I If I remember correctly, there was someone that received a 350 from them that had 305 heads, so you should check those casting numbers, under the valve covers. I think they were good about replacing them, though.

That was me John, about 4 yrs ago........good memory.

I had no problems w/ Raul, he sent me the correct heads and I have had no problems w/ the engine after 230hrs!! Runs great!

 

[FreeBeeTony]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

So i want more input I did pay extra and want to make sure I am getting what I paid for.

Shoulda went with the Vortec heads.........

 

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Ok I thank everyone for there feed back.The Heads are the 193 casting number, dont know if they came on a 305. The engine I got it a long block from Rapido I ask him " RAUL" to build me a 350 hp engine he ask my outdrive told him it was an ALPHA1 he said it wont handle that I said ok build me a 320 hp. he said with a cam and spring upgrade and it being bore 30 over I should be 300 to 320 hp then I told him I wanted flat top pistons. I have no idea how he can say I am going to get this for sure without a dyno. So I was hoping for some feed back and now I am hearing about water ingestion, and that I will be around 280 HP. Raul seems very short with people. So i want more input I did pay extra and want to make sure I am getting what I paid for.

OK keep in mind, that someone here might be refering to prop HP and Rapido might be refering to crankshaft hp. The alpha drive will eat up 20hp or so.

As far as the cam, I don't believe you can say it will absolutly be an issue. Assuming Rapido has used this in other 350's, probably not. Just something you should check on once its running.

I did find some conflicting info on the 191 heads. One site indicated 305/350 with 305 sized valves. Most just say 350 heads, with no chamber size or valve size. Some forums indicated 76cc other 64 or65cc. Clear as mud.

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

They are 193 heads..

 

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

They are 193 heads..

Sorry about that, but doesn't change the answer much. Still confilcting data, but many say it is swirl port head, good for low rpm torque applications.

 

[wca_tim]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

bottom line, you got a pretty close to factory 350 that should hold up a good while and get decent fuel economy. run it and enjoy it.

If you want more power, Heads are the first place to start - vortecs at a minimum. also, with restrictive marine exhaust, a split duration camshaft is a smart choice (keep exhaust valves open longer to offset poor exhaust flow - both in heads and exhaust manifolds). You probably didn't get any help in power from the cam, but did probably gget a light lope with it. It should be OK with respect to reversion, but is a little close to comfort - check it after idling for a while as mentioned above to be sure. check on the water, not on muffs...

I could say more, but nothing I can think of that would be immediately productve... go boating and enjoy it!

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

well that does not make me happy when i paid more for 300hp..

 

[wca_tim]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Those heads, decent intake, a little better than 10:1 compression (close on pump gas) dyno headers (when most people quote dyno numbers, they're numbers generated with headers, NOT with their marine exhaust.... just sayin...), you're probably not far off 300 horsepower at the crank... most people who think they have 300, probably have more like 250 with their engine in the boat, in real time current state of tune, current condition, etc...

I'd bet that you would see a small but noticable increase if you went with 1.6 rocker arms on the exhaust valves...

Throwing a bunch of theoretical numbers out and getting upset that they're not what you thought they should be is not a very useful exercise... put together, maximize the tune with jetting, timing, prop and set-up variables, and then if you're happy with the way it runs - you win!

just remember that step changes in horsepower and torque cost money... a LOT more than a near stock reman engine if you want great big jumps. food for thought.

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

what is a decent intake??

 

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

what is a decent intake??

Interesting.... It seems that intake manifolds for '87-95 smallblocks are becoming extinct (ones with center bolts canted). I only found the cast-iron high-rise in the pre-87. An Edelbrock RPM would be equivelent in performance, but Edelbrock doesn't show any that fit those heads any more??? They do have the Performer 2104, which will accept Q-jet or square bore. That would work, but not as much improvement as rpm model. Might have to look for used.

PS: to use aluminum intake you need to have fresh water cooling or boat in fresh water only.
PS2: an intake change may also require carb tuning, ie changing of rods and/or jets.

The GM part number is: 14097494 http://store.gmperformanceparts.com/store/SelectProd.do?prodId=7697&redir=true&manufacturer=GM&category=Intake%20Manifold&name=Cast%20Iron%20Dual%20plane%204-bbl%20&model=<!--14097494-->

 

[jrturbo]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

what about a 2604 eldebrock

 

[John_S]

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

Re: New reman engine 350, what to know about what hp I will be getting out of this wi

what about a 2604 eldebrock

It looks to be the air gap version of the one I listed (2104). Will keep carb cooler,