Offshoreonly.com - 600 ci NA build

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - 600 ci NA build (https://www.offshoreonly.com/forums/general-q/351197-600-ci-na-build.html)

Single cat

05-25-2018 10:54 AM

Pull

Just made our finial pull with some fuel in it. Made 1005hp and 858 lbs at same rpm. Time to call it good. Will post dyno run latee.

hogie roll

05-25-2018 11:31 AM

Quote:

Originally Posted by MILD THUNDER (Post 4628380)

yep. Goes back to the thoughts that runner volume isnt the end all to cylinder heads. Architecture is the key.

id love to see the numbers from 3500-5000. My guess is its making more than enough torque to get a 32 skater up and flying

He has a multi speed trans too, so I don’t expect he’ll have an issue. Would be interesting to see how they’d do in a V.

i think a 632+ using the new big m pro series block and these heads would be the ticket.

14 apache

05-25-2018 11:40 AM

Very impressive numbers that should get your skater to 160MPH with out a problem nice job.

14 apache

05-25-2018 09:40 PM

Did you run any vacuum on the motors when you had them on the dyno? If you did how much?

Single cat

05-26-2018 09:18 AM

Engine

The pumps pull around 9 inchs of vacuum.

Baja Rooster

05-26-2018 12:03 PM

I can’t wait to hear this beast.

Single cat

06-03-2018 08:32 AM

Know the fun begins

https://cimg2.ibsrv.net/gimg/www.off...31fb041c99.jpg

dunnitagain

06-03-2018 08:31 PM

Quote:

Originally Posted by Single cat (Post 4628386)

We made one pull down at 4500 but i cant remember the numbers off the top of my head but it was mean. David add more water to the pump. He said he dont like pulling motors like that down low because its rough on his pump.

Those little Superflows cant handle big torque , low rpm loads . The brake doesnt have enough diameter , for the water capacity to pull the engine down that low.
David is right , I wouldnt pull my dyno that hard either!

SS496

06-04-2018 08:22 AM

Those look like the B&M 2 speed marine transmissions. I have a set as well in my Cat. Where did you get parts for them?

I believe they are a derivative of a 727 torqueflite........so most of the internals should interchange. Any information is appreciated.

Im also following this build because I have a somewhat similar set up in mine......598's, dart big chiefs, single dominator's, B&M 2 speeds, SSM #5's......unfortunately I do not know what cams are in the engines since I just bought the boat in April. Ill have to get off my butt and measure the valve events.....so far ive just sorted out the over richness of the carbs and will install a CB black boxes (only $200 and they interface between the distributor and MSD box) so I have computer control over timing.

14 apache

06-04-2018 11:59 AM

Quote:

Originally Posted by Single cat (Post 4628505)

The pumps pull around 9 inchs of vacuum.

Are you going to run vacuum in the boat?

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