548 BBC with AFR heads Dyno Time Only 702hp
 

Regretfully posting this up for sale. Some recent unexpected life events dictate it selling. I JUST got this back/done. Fresh 2021 build Dart 548" with dyno time only from a very reputable builder, Frank Ungarten @ FU Marine. JUST got off the dyno and back in the garage ready to go. The motor made a peak hp of 702.0 hp @ 5700 rpms, peak torque of 684.7 @ 4700 rpms. The motor probably had another 10-15 hp with a 1" wilson spacer. The motor is 9:6:1 Compression ratio. It would eat 87/89 octane fuel if needed. I don't think you could remotely buy the parts/build this engine/dyno it for the $ I am asking.
The specs:
Dart Big M 9.8 Deck block. Line Bored/Final Machined/Lifter bores accurized/Hot Tanked. Black 2k engine paint.
Calles Forged 4.250" Stroke Crank
Scat I Beam Connecting Rods with ARP 2000 Rod Bolts
Clevite Main/Rod Bearings
Full Double Roller Timing Chain (either roll master or comp- can't remember)
Billet Alum Timing Cover
Every fastener on the motor is ARP 12 Point Stainless, even the oil pan hardware you cannot see ($$$)
Fel Pro Gaskets
Dooley Enterprises 12 quart oil pan w/ teague drain hose modification (drains out the bilge drain hole with a hose)
Stainless water crossover
AFR 335 full cnc heads. 115cc.
Pac Racing valve spring upgrade from afr along with their inconnel exhaust valves.
Cometic .030 MLS Head Gaskets
JE (not SRP 4032 cheaper alloy line), real JE flat top forged 2618 alloy pistons with total seal rings.
Pistons are .018" in the hole. 4.530" bore.
Marine Kinetics Billet core double firing order swap custom spec'd cam with bronze melonized distributor gear.
MSD Pro billet ignition controlled by a daytona sensors ignition box. Fully tuneable with a laptop.
Full Mercury engine harness ready to plug into a hull harness.
Edelbrock Victor Jr. 454-r 4500 Dominator Flange Intake
Holley 4500 1050 Dominator carb.
ATI 8" Super Damper/ARP Damper bolt/ATI pointer.
Eddie Marine Throttle Bracket
Hardin Marine Polished Valve Covers
Hardened 3/8 Pushrods
Johnson High RPM Full Roller Lifters ($$)
Crane Roller Rockers 1.7 Ratio
High Torque mini starter ARP Flywheel Bolts Mercury Flywheel
Mercury gen 4 raw water pump Mercury Power steering/alternator/brackets

looking for 20k or best offer. pictures are on facebook. cant figure out how to post them here
https://www.facebook.com/marketplace...50614215361242

Hope all works out for you. Probably your dream build and then life kicks you in the azz. Been there. Good luck with sale! Nice build.

thanks man! It was a dream build. Boat it was going in wound up having a wet transom and a bad stinger... became more work then I wanted to do... But on the flip side I replaced it with a 29 fountain with a 604ci potter efi motor... Just wanna sell this to offset some of that cost.

any chance you could post a few pics of your build?

See the link on bottom of listing. Several pics and dyno sheet.