motor swap outs
 

:evilb: i currently have 1993 merc. 7.4 or 454 ci. 425hp motors on trs drives and trannies in my boat. what is the current motor swap for my application? will the new 496 ho bolt right up, will a hp500, 525, or just about any BBC bolt right up or are the bolt prtterns different? anyone know about what a rebiuld on mine should be, the blocks are cracked from ice, help???????????

thanks guys for any help:(

Re: motor swap outs
 

come on, i know there are some smart people on this site, we can't all be this dumb. help???

Re: motor swap outs
 

What boat?

Jon

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Motor Mounts Are Different On The 496s ..You Would Have To Redo The Front Mounts ...The Back Of The Motors Will Accept Your Stuff ..Ask Jeff From JC PERFORMANCE ENGINES About Rebuilds With New Or Used Blocks

Re: motor swap outs
 

Well, the bolt patterns on the bellhousing are the same and the rear mounts should be also. But most of the bolt-ons will not work on the 496. Best thing is to get take out dressed engines and they should basically bolt right in.

You can't rebuild if you have cracked blocks, but you might be able to use your rotating assembly in a new block.

Re: motor swap outs
 

496s will bolt to the bellhousings,But the flywheels are different.The motor mounts are also the same bolt pattern and in the same location.So you can take one out and put one in with no realignment.But that is all that is the same . Nothing off of your mark4's will interchange not even the exhaust manifolds. JOHN

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I have 2 blocks if interested..........hell complete engines that need some refreashing I need to move. PM me if interested.
@475hp 454 carb .

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this is what i thought but my shop is telling me that the 496, 502, or no other blocks would bolt right up to my trans's. i need a guote for both options for my insurance co. and i think my shop is mistaken or trying to make the most $$$ for themselves without being truthfull, imagine that, in vegas none the less. thanks, any more info would be great.

robert

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Front Mounts Are Different

Re: motor swap outs
 

I used these guys for my big boat and their service was great. They have decent prices on their rebuilds and you would not have to worry about changing bolt ons.

http://www.ebasicpower.com/engines/index.htm

OTOH-if you need to repower it's always nice to move up in power:D 502's should fit in your app.

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i have twins with offshore mounts in my "93" 38' cig, anyone see problems with thoughs being different?

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1993 cig top gun

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Offshore mounts are more adjustable so it may take a new bracket set, but should not be a big deal.

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Shouldn't any Merc high perf. motor slap right in with minimum effort? 496, 500 (efi/carbed), 525efi, 525SC, 502, etc. etc. etc. Not really that big of deal no?

Wouldn't the cheapest route be to buy some new blocks and throw 'em back together?

Re: motor swap outs
 

I have 2 454 long blocks for sale if you are interested one has 25 hrs and the other has about 250 but the blocks and heads are good. They were running when I took them out to repower a customers boat. And by the way you can put any big block chevy in your boat will only a little extra effort gen 4 5 or 6 it dosent matter. If you have any questions call me @ 714 369 7410 and good luck.

Re: motor swap outs
 

I have found that as you shift from generation to generation what you run into is accessories not bolting on and having to hunt for brackets and stuff. The easiest thing is to go with the same long block generation you have so it all bolts back up. Getting new blocks is an option but by the time you pay a machine shop to assemble it with all new rings, bearings, and miscellaneous stuff you can by a reman from a large scale builder and be back on the water in days instead of weeks or months-assuming you are just going back to stock power.

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Anyone know of a quality shop out in Havasu to help grimmy out? I think he needs a second opinion from a shop that can give him a qualified estimate for insurance.

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I am repowering a 35 Formula with 2 new GM 454/425 Gen 6's. There is very little different on the 454 Gen 6. I had to drill out some brackets from 3/8 to 7/16 because the Gen 6 head bosses are all 7/16. We also had to rebalance the Gen 4 flywheel, but it does work. Little else has to be modified. The engine mounts and bellhousing bolt right up.

Hope this helps.

Barry

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hey matt, these are the ones we talked about. check the link and we'll be on the same page. what do you think? the guy will buy them back if they have any big problems after running them on your engine stand like we talked about.

robert