Just so no one gets their panties in a wad. Boyds knows his sh!t. My 598s blown make 1000 hp and 1000 ft lbs at 4300. Not one problem and they have 100 hrs on them. Did you upgrade fuel pump? I had a motor built by one of the best drag engine builders in the Midwest and I never upgraded , first pass I almost ran over my crankshaft. In my opinion I'd put big pumps at least an a1000. Anyways Boyds does a ton of marine products. I bought my boat used and everything but the motors have let me down.

How big is the pick up in the tank?

I wouldn't hesitate too take too boyd or eric for that matter. But we have and always will support smith power and I'm sending there for refresh. Bob which is brads dad is awesome. Boyd is very reputable and if something they did I'm sure he will make it right. Just my .02

Thats why I asked, Boyd's just did two Dart blocks for a buddy of mine, key'd big bore lifter's and 60 mm cam tunnel bearings. Brad build my 540's

Why are you making it sound like they are just rebuilt??? A little mouse told me you have 35 hours on them roughly. I once had a builder tell me when it fires up and runs with no problems then he did his job. But to make a reputable builder sound like he did something wrong 30 some hours later is bullsheet

33 you will be very pleased with the motors boyd built.

Mike the motors have over 30 hrs. It isn't the builder

See post 27 about the fuel system, all new as it was MPI prior...

Tank pick up is 3/8 NPT and it's tapped for dual engines, being a single engine I've set it up to draw from both into the fuel filter

Who's motors are you referring to? My hour meter (installed with the engine) reads 9.2.

Your motors. You ran them all summer is what I'm told. Here's what I would do. Backup from talking about or trying to involve engine builder. Think about what you've done differently. Take a fuel sample as we know marinas are so honest lol... did pump quit for a minute or whatever but a builder isn't responsible for detonation or anything when it leaves their hands after dyno in my opinion. Also c &s is awesome. So is Patrick at pro systems. The thing that sucks too me about this is you threw a reputable builders name out immediately.

Guys I don't think the OP was shooting the builder yet just said he wasn't sure what to do from here. Me personally I think if he is willing to stand behind his work and make it right or come to some kind of agreement with you I'd let him do it.