opinion 383vs454

Reply Subscribe

Thread Tools

08-09-2011, 06:49 PM

#11

87MagnumII

Registered

Gold Member

Join Date: Apr 2010

Location: Daniels, WV

Posts: 895

Likes: 0

Received 10 Likes on 5 Posts

Quote:

Originally Posted by GPM

That might take a lot of HP.

I second that motion

08-09-2011, 08:28 PM

#12

JeremyAnderson

Registered

Join Date: Mar 2010

Location: Salisbury, NC

Posts: 62

Likes: 0

Received 0 Likes on 0 Posts

350 to 383 is night and day, but it will take a BBC with a blower to gain 25mph! I really think you'll like the 383

08-11-2011, 11:58 AM

#13

prerunner404

Registered

Thread Starter

Join Date: Jun 2010

Posts: 52

Likes: 0

Received 0 Likes on 0 Posts

ok i was afraid of that i was gonna have to go big block to get some mph outta her what kind of speed increase do you think ill get with the 383?

08-11-2011, 05:09 PM

#14

tmdog

Registered

Join Date: Aug 2003

Location: Ga. & Fl.

Posts: 177

Likes: 36

Received 3 Likes on 1 Post

Build a 383 right and that boat of yours will do hi 60's or 70.
Dump the tbi and carb it.
Dynoed my 383 at 491h/498t. Boat equipped w/ Alpha.

08-12-2011, 02:40 PM

#15

prerunner404

Registered

Thread Starter

Join Date: Jun 2010

Posts: 52

Likes: 0

Received 0 Likes on 0 Posts

how long you been pushing it with that alpha tmdog? how big is your boat

08-12-2011, 04:41 PM

#16

prerunner404

Registered

Thread Starter

Join Date: Jun 2010

Posts: 52

Likes: 0

Received 0 Likes on 0 Posts

also what prop sizes are you guys running on your alphas with the 383

08-12-2011, 04:49 PM

#17

Fenderjack

Pirate of the Chesapeake

Gold Member

iTrader: (2)

Join Date: Aug 2006

Location: North Point Creek, Md.

Posts: 4,330

Likes: 0

Received 0 Likes on 0 Posts

What gearing is the alpha??

John

08-12-2011, 05:03 PM

#18

GPM

Registered

Join Date: Mar 2004

Location: Pa

Posts: 2,663

Likes: 7

Received 80 Likes on 58 Posts

What HP are you running now ?

08-12-2011, 05:25 PM

#19

onesickpantera

Registered

iTrader: (1)

Join Date: Feb 2005

Location: Michigan

Posts: 4,388

Likes: 40

Received 21 Likes on 10 Posts

Quote:

Originally Posted by prerunner404

well im sold then ill do the 383 it seem to make more sense to me. right now my boat only runs about 35-40 with the 350 i have it has about 350 hrs on it so i know she is gettin tired i have to run it at wot(4500rpm or so) just to get any where and that yeilds me about 35 mph. im looking to get the boat to run in mid50's to low 60's. im always easy on outta the hole take offs so i think i can baby the drive for a few seasons.

its a tbi motor so can i reuse the tbi? or do i have to switch over to carb or multi port injection?

That seems like VERY low mph. Unless that motor is hurt I agree you are going to need A LOT of hp to hit 60mph.

Are you running an aluminum prop?

08-12-2011, 06:15 PM

#20

tmdog

Registered

Join Date: Aug 2003

Location: Ga. & Fl.

Posts: 177

Likes: 36

Received 3 Likes on 1 Post

Quote:

Originally Posted by prerunner404

how long you been pushing it with that alpha tmdog? how big is your boat

383 is mounted on a 18 Donzi and been running 400+hp for the past 4yrs. Alpha has a 1.5 gear and turning a 25 Hydro.
Building a solid and reliable eng. is critical and very costly. Did I mention costly.

Reply Share

First
Prev
2 / 3
Next
Last