454 seized and cracked manifolds

i recently picked up a 1989 barefoot nautique with a 454 with only 280hrs. the block was cracked and seized and the manifolds are cracked pretty bad. I have another 454 block so im dropping both motors off at machine shop and having a fresh rebuild done The questions i have is theyre any upgrades i should do while the motor is apart? maybe a cam or roller rockers. second question where would be a good place to find replacement manifolds?

I have a set of merc manifolds you are welcome to them if you want them.Oh the dreaded 454 RR cam question not much out there.I have a comp cam a little better than stock with new lifters ready to install get yourself a decent set of heads if you really want to see any improvement in performace. You dont have to spend a lot (like I did) to wake it up costs about the same to rebuild 781's or 049's which flow a lot better than stock peanuts. Also have stock peanuts you can bolt right on cheap save you some money if you are happy with stock ones.I am rootin for you seems not too many big block threads actually get finished here.(stirring things up! mine is almost done) so I am guilty of the same thing just waiting for cam to get here so I can button it up.My build got way out of control.They say big inches or big dollars or C all of the above

Waterdog wrote: 89 2001's are std rotation maybe the 454's in 89 went to the 1.23 trans and are std too!

I dont believe that to be the case. All '89-90 454 powered CC's Ive seen have reverse rotation 454's mated to BW 72c 1:1's.

thanks for all the information this is my first decent boat. would mercruiser manifolds work? mine say pleasure craft. how much you want for them shipped to 03872

I will grab the numbers tomorrow. hopefully the heads off the nautique will be ok to use with just a resurface,how much for the manifolds i thankfully will meet you half way. the engine and boat only have 280hrs. its a shame the previous owner just let the boat sit without winterizing it. What would a 89 barefoot nautique with new interior, fresh motor, and a 1991 trailer in great shape be worth roughly? trying to reassure myself i didnt get screwed over.

UT, dont bother with the peanut ports if that's what oldcuda is selling... those are the same as what youve got already, and are a major choke point on the BBC's. We'll get you set up with a set of 781 or 049's when the time comes for the Banana boat to go under the knife. I may have a RR flat tappet core that I could donate to the cause as well. Word on the street is that Comp is fresh out.

We're taking steps to get the '79 back in the water soon... all it took was a big pile of money! We'll see if we can crack that 60mph mark yet.

Oldcuda, I hear where youre coming from! Those heads might work great for Brian86's '89 BFN. My comment above was directed to my Uncle Todd (Got Tiques).

Century you say... any chance you went roller on that RH 454?

Wow, that sounds like an awesome build. Would love to check it out in person.

You and I got the last 2 roller cores- Bob told me the other one was going in a Century. Cool that its local!

We hope to have our BFN back in the water by the 4th as well... we had to go a little wilder than expected on the cam (slightly less lift than you, but more duration) due to our excessive compression (10.4) matched to iron heads... I havent gotten the data spit back out yet with the expected performance numbers, but I think we'll be in the 480hp range, probably peaking ~5600rpm. With the new cam and upgraded exhaust, Im expecting to see a consistent 60mph... we were in the 58-59mph range last year with the Comp cam and stock-like 3" Osco cast iron manifolds. Had we been starting from scratch rather than inheriting a strong running longblock, a stroker (496) 454 would have been the perfect starting point.