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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   Build a 650-700 hp engine. N/A or blower? (https://www.offshoreonly.com/forums/general-boating-discussion/334652-build-650-700-hp-engine-n-blower.html)

Keytime 02-24-2016 10:54 AM
Originally Posted by caseyh (Post 4407712)
I did 598s na made 724hp 725tq on 87 pump gas.http://i902.photobucket.com/albums/a...ps7ihdygsd.jpg
Any estimate on valve spring replacement hours and rebuild hours?

jeff32 02-24-2016 11:28 AM
Nice engine!!!!

CDShack 02-24-2016 11:37 AM
Originally Posted by Tom A. (Post 4407855)
I have 700hp blower motors and love them.

That said, I would take 700 N/A motors any day for the fact they have way fewer moving parts, belts, and potential for things to go wrong and if built right can run on 89 octane. I am running 93 octane which is getting harder to find on the water.
And NA motors don't stick out of the motor cover!

caseyh 02-24-2016 11:51 AM
Originally Posted by Keytime (Post 4407863)
Any estimate on valve spring replacement hours and rebuild hours?

Top end is norma and bottom end Ron is saying 400 and hopefully more. They are big but very low cop to run 87. Dart tall decks, alm pro 1 heads, all ported, fully roller etc. http://i902.photobucket.com/albums/a...psflymmdsr.jpg

Tom A. 02-24-2016 12:25 PM
2 Attachment(s)
Originally Posted by CDShack (Post 4407900)
And NA motors don't stick out of the motor cover!
Well that depends........

Potter 850 N/A and 700 N/A

jeff32 02-24-2016 04:52 PM
Originally Posted by Tom A. (Post 4407855)
I have 700hp blower motors and love them.

That said, I would take 700 N/A motors any day for the fact they have way fewer moving parts, belts, and potential for things to go wrong and if built right can run on 89 octane. I am running 93 octane which is getting harder to find on the water.
Good point!

F-2 Speedy 02-24-2016 05:21 PM
Originally Posted by caseyh (Post 4407910)
Top end is norma and bottom end Ron is saying 400 and hopefully more. They are big but very low cop to run 87. Dart tall decks, alm pro 1 heads, all ported, fully roller etc. http://i902.photobucket.com/albums/a...psflymmdsr.jpg
Your bilge looks like a operating room, nice looking mils, whats up with the collar on the header flange......whats the bullet weigh ??

TooLateVTEC 02-24-2016 07:15 PM
Originally Posted by MILD THUNDER (Post 4407827)
Ive been running for years without intercoolers, and have held it wot for alot longer than 30 seconds at a time. Closer to 30 miles wide open on funs runs .
I was thinking EFI, a little bit different with the carbs on top vs port EFI.

ROB FREEMAN 02-24-2016 07:44 PM
um no quote . want to delete post

ROB FREEMAN 02-24-2016 07:49 PM
Originally Posted by 33outlawsst (Post 4408060)
Your bilge looks like a operating room, nice looking mils, whats up with the collar on the header flange......whats the bullet weigh ??
going to be tight fit .. that hatch arm looks like it might hit when closing on the tails clamp ...mine was hairline close on my cig .. yours looks to be the same .. looks sweet enjoy, raised port heads n talldecks make for a wide package been there done that .. my headers had to be " leaned " as cmi calls it .


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