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-   -   Need engine advice N A 598 cubic inch rebuild (https://www.offshoreonly.com/forums/general-q/318685-need-engine-advice-n-598-cubic-inch-rebuild.html)

HaxbySpeed 12-31-2014 11:30 AM

S30, that's a pretty expensive set of heads to only make 740hp with. If that's all you were shooting for, the 325's out of the box would do it no problem.

Mayor, sounds like a great build, and is right where it should be on power with the components you used. Obviously there's a fair bit of power potential left with a cam swap, given the cubes and compression. But, realistically do you need any more? It will be a very reliable combo I'm sure.

HaxbySpeed 12-31-2014 11:39 AM

:food-smiley-007::food-smiley-007::food-smiley-007::food-smiley-007::food-smiley-007:

It's cold here today

KWright 12-31-2014 11:40 AM

My results
565 cu in, 9.3 comp., n/a efi 759@ 6400. Fully dressed with wet exhaust.

PurdueCAT 12-31-2014 11:43 AM


Originally Posted by MILD THUNDER (Post 4242255)
I see your from Lafayette. Where do you boat around there ?

I boat at Mississinewa Reservoir nearly every weekend and Cumberland once or twice a year. At 78mph I am by no means the fastest boat at Mississinewa.

PurdueCAT 12-31-2014 11:44 AM


Originally Posted by KWright (Post 4242286)
My results
565 cu in, 9.3 comp., n/a efi 759@ 6400. Fully dressed with wet exhaust.

details on this build or did I miss them earlier in the post?

SB 12-31-2014 11:50 AM

To save people looking it up:

Comp Cam #11-461-8
Intake Duration at 050 inch Lift: 254
Exhaust Duration at 050 inch Lift: 260
Duration at 050 inch Lift: 254 int./260 exh.
Advertised Intake Duration: 308
Advertised Exhaust Duration: 314
Advertised Duration: 308 int./314 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.575 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.575 in.
Valve Lift with Factory Rocker Arm Ratio: 0.575 int./0.575 exh.
Lobe Separation (degrees): 112

MILD THUNDER 12-31-2014 12:21 PM


Originally Posted by PurdueCAT (Post 4242287)
I boat at Mississinewa Reservoir nearly every weekend and Cumberland once or twice a year. At 78mph I am by no means the fastest boat at Mississinewa.

Wow. Just looked it up. Never even knew it was there. We got a place on Shafer lake. I'll have to check that out sometime

PurdueCAT 12-31-2014 12:44 PM


Originally Posted by HaxbySpeed (Post 4242277)
S30, that's a pretty expensive set of heads to only make 740hp with. If that's all you were shooting for, the 325's out of the box would do it no problem.

Mayor, sounds like a great build, and is right where it should be on power with the components you used. Obviously there's a fair bit of power potential left with a cam swap, given the cubes and compression. But, realistically do you need any more? It will be a very reliable combo I'm sure.

I agree, I think something in the .660 lift range would free up alot of power.

KWright 12-31-2014 12:51 PM


Originally Posted by PurdueCAT (Post 4242288)
details on this build or did I miss them earlier in the post?

4.25x 4.600, Brodix -2plus heads cnc ported by rsd. crower 1.8 ss shaft rockers, Hogan sheetmetal intake, custom mercury racing 525 efi throttle body, Whipple tuned mercury computer, Hardin cyclone headers with Gil tails.

fbc25el 12-31-2014 12:57 PM

Mr mayor, how was your service with your engine builder? I currently use a guy in indy but I am looking for a little closer shop. I met you a couple of years ago at Cumberland poker run we were at wolf creek with Tim & Terry. Fred.


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