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Swapping small block for big block?

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R/C-PILOT

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« on: January 24, 2008, 06:47:14 PM »
 Have any of you guys swapped a small block for a big block chevy?  I'm interested in problems you may have encountered.  What's the weight difference.  How about dimensions?  Seems to me, the mounting points are the same dimensions, right?  Big blocks are wider and longer by 4-5 inches?  I bought a BBC and planned to build it with my 12 yr old son (and a good machine shop).  My goal, is a blown 6-700 hp BB. The boat I have is a 1988 16ft Tahiti w/sbc and Berk 12je.  I planned on a couple year build, then buy a different hull to put it in. But I was thinking, why couldn't I put it into the Tahiti?  Any suggestions? Certainly, you Cali guys have been there and done that. Any input?
« Last Edit: January 24, 2008, 06:55:32 PM by R/C-PILOT »
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco


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GAWnCA

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« Reply #1 on: January 24, 2008, 06:56:14 PM »
Sell me that boat the way it is and find a bigger hull  :)  That is a sweet deal there!
~Greg
Forgive your enemies.  It messes up their heads.

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« Reply #2 on: January 24, 2008, 07:46:55 PM »
Sell me that boat the way it is and find a bigger hull  :)  That is a sweet deal there!
Boat is to sweet to sell.
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

FORKEDUP

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« Reply #3 on: January 24, 2008, 07:48:42 PM »
def a very nice boat :)
BEAUTY IS ONLY A LIGHT SWITCH AWAY
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19' eliminator daytona 496bbc (still in my heart)
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« Reply #4 on: January 24, 2008, 08:04:00 PM »
I'll  take it the way it sits ;D
1979 Sanger Superjet
BBC, 12JG

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« Reply #5 on: January 24, 2008, 08:05:51 PM »
I got first dibs!!!   :D ;) ;D  I'll be in Kansas City this Aug. so if you change your mind, I'll drop by and take it off your hands.
~Greg
Forgive your enemies.  It messes up their heads.

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« Reply #6 on: January 24, 2008, 09:10:33 PM »
That is the nicest looking 16' jet boat I have ever seen.  :o

The SBC and the BBC use the same rear engine mount. You shouldn't need to move the rear engine mounts feet on the stringers. The front mounts are very similar but I've never had a chance to actually check to see if they're exactly the same. I'm guessing the weight shouldn't be more than a 100 pounds difference.

I"m guessing your Tahiti has 1/4 stringers, if it does I wouldn't put a blown BBC with 600 -700 HP in it.

Build a nice 383 stroker and call it a day. It can be set-up to run real well, won't stress out your hull like a blown BBC, and IMO a cooler boat. Good luck!
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« Reply #7 on: January 24, 2008, 09:13:25 PM »
Build a nice 383 stroker and call it a day. It can be set-up to run real well, won't stress out your hull like a blown BBC, and IMO a cooler boat. Good luck!

Best advice so far. You can get 425-450 HP out of a reliable 383. All day long
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« Reply #8 on: January 25, 2008, 04:37:53 AM »
The boat has full length stringers.  Sure would look sweet with a blower back there.

« Last Edit: January 25, 2008, 04:46:26 AM by R/C-PILOT »
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

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« Reply #9 on: January 25, 2008, 05:10:31 AM »
Yup rear mounts are the same. Get front ones on E-bay. Either Glenwood or Harmon Marine. Then you need headers, distributors are the same. Pretty much not that big deal of a swap. I went from Ford engine mounts (bought my boat w/o engine) and swapped it over to a BBC.
  T.J.

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« Reply #10 on: January 25, 2008, 05:39:46 AM »
I will be putting a spam thread on here shortly. It will be Everything for a jet boat BBC, and possibly sell a core motor as well

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« Reply #11 on: January 25, 2008, 08:33:57 AM »
That is the nicest looking 16' jet boat I have ever seen.  :o  ...

Second nicest, I forgot about the 16' jet boat that Josh at JBP has... it's still a beutifull boat.

The boat has full length stringers.  Sure would look sweet with a blower back there.

Then my guess is you can put pretty much anything you want in there. But you can still put a blower on a small block and get plenty of HP.
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NO REGRET$ ... Arguing on the internet is like competing in the Special Olympics / no matter how good you do you're still retarded!!!!!

                                                          1978  19' Mach 1 Tunnel jet

UNDONE

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« Reply #12 on: January 25, 2008, 08:44:49 AM »
I agree with the 383 idea. Actually looking at one myself. TandLengines.com has some pre balanced, checked and machined stroker kits for Chevy's. They're ready to go out of the box if you want to assemble it yourself. Prices are also very reasonable. These guys are absolute professionals they have a long list of NASCAR teams and drivers for clientèle. Definitely worth a look and a call. If nothing else you'll come out of it with a whole lot of ideas and a better understanding of the advantages of the 383.

Here are their kits for the 383, or you can have them complete an engine for you starting around $3200 for that price you can expect a solid 400HP and let them know you're planning on a blower motor so they can supply the right equipment.

jet boat performance

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« Reply #13 on: January 25, 2008, 10:11:29 AM »
R/C we have succesfully run/built/and owned multiple Small block boats over the years and NEVER been unhappy with the out come Obviously not a good power plant for a 23 ft Sleekcraft but Sbc's and Sbf's are fun to build easy to work on and make good power Tom

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« Reply #14 on: January 25, 2008, 10:24:07 AM »
Alway's good to be re-inforced by the pro's Tom...
P.S. T&L engines offers a 2 year 24,000 mile warranty with every engine they sell.

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« Reply #15 on: January 25, 2008, 12:16:24 PM »
R/C we have succesfully run/built/and owned multiple Small block boats over the years and NEVER been unhappy with the out come Obviously not a good power plant for a 23 ft Sleekcraft but Sbc's and Sbf's are fun to build easy to work on and make good power Tom

Tom, the problem is getting certain parts for the SBC.  When I was looking for thru-transom headers, a good set was almost as much as I paid for the boat. You sure as heck can't find a decent set used.  Their are a million BBC parts out there, new and used.  Just more out there to choose from.  I decided I wouldn't skimp on the build and by the time I would finish this motor, I would see about putting it in the Tahiti or another hull.  Looking at the boat forums, their are a bunch of good deals out there.  Besides, I'd have a blast coming out to California to get another jet or v-drive hull.
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

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« Reply #16 on: January 25, 2008, 12:22:48 PM »
Sounds like a good time, however I just so happen to have access to some small block parts you may find yourself interested in. Thru transom exhaust logs, motor mounts, etc. If your dead set on headers ask Tom he seems to have a good working relationship with Rewarder. I have had 2 sets of headers done by Jim and family. Great people, reasonable pricing. Headers are inherently expensive however the last time I spoke with Jim I drove down to his shop on a sunday for a custom set of headers and he seemed to be in a place mentally where he is more out to see people having fun and enjoying their toys (as he does) than he was with making outrageous profits. He gave me very good pricing and he will be my header source in all my future projects.

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« Reply #17 on: January 25, 2008, 03:28:34 PM »
Definitely would want thru-hull headers.  I've got polished logs now. Tom had a pair of decent over transom headers a while back, but I didn't want that much noise, nor would i want to chop up my cockpit cover. Undone, I'll keep you in mind when I decide what direction I go. SBC or BBC.
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

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« Reply #18 on: January 25, 2008, 05:30:49 PM »
Tom at Jet boat performance is your man for the rewarder headers. But I will keep an eye out for you. I love small blocks. Had all big blocks until 4 months ago. Now my 600WHP F250 w/460 is gone, 454 conservative 550HP 18' jet boat is gone, now all I have is a 354 Hemi and 350 Chevy, and a bunch of blocks lying around. My next planned project is already in the works and will absolutely be a small block.

Like Tom was saying, he's been very successful with small blocks, and had some good times with one screaming SBC jet. (literally 7000RPMs w/ a 6-71 huffer up top 10.5:1 compression).

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« Reply #19 on: January 25, 2008, 09:44:24 PM »
I certainly would consider a small block, but again, one of the major costs of a SBC is the 3K$ headers.  For a newbe like me, the SBC flies.  Just want the most of what I do or build.  BBC starts out at more HP than what I have.  I've always wanted a blown motor.  I'd very much like to build a BBC blower motor, then find a hull for it.  I would just keep the Tahiti and buy a new hull.
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

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« Reply #20 on: January 26, 2008, 10:47:41 AM »
$3k? You definitely need to call Rewarder, on a cold call basis I'm pretty sure he can at cut that in half. unless you're talking about an IMCO system or something. The expensive ones are for a 460...

http://www.rewarderheaders.com/search_result.asp?CATEGORY=ALL&MANUFACTURER=Thru-Transom&DESCRIPTION=&PRODUCT_ID=

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« Reply #21 on: January 26, 2008, 04:59:07 PM »
Undone, I was talking about the Lightening's that CP sells. Their awful proud of them bad boys at $3200. I know by their description, their serious quality but the price still kills me.  I guess, when I'm ready, I'll be taking a look and see what's available at that time.  I already have the BBC and still plan to build it with my 12yr old son.  Their was a guy on HotBoat, went by Billet, lived in MN or MI.  He had the same 16ft hull (older version 76ish) that had a bigblock from the factory. We compared a few notes back then, but I'd love to get back ahold of him now. I haven't seen him on any other boards.
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

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« Reply #22 on: January 26, 2008, 05:03:14 PM »
Second nicest, I forgot about the 16' jet boat that Josh at JBP has... it's still a beutifull boat.

Then my guess is you can put pretty much anything you want in there. But you can still put a blower on a small block and get plenty of HP.
Have ya got a couple of pictures of Josh's boat? Or any other 16 footers?
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

hotrod56cars

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« Reply #23 on: January 26, 2008, 07:09:41 PM »
Have ya got a couple of pictures of Josh's boat? Or any other 16 footers?

http://www.socaljetboats.com/index.php?topic=1784.0
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NO REGRET$ ... Arguing on the internet is like competing in the Special Olympics / no matter how good you do you're still retarded!!!!!

                                                          1978  19' Mach 1 Tunnel jet

R/C-PILOT

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« Reply #24 on: January 26, 2008, 08:16:24 PM »
R/C

1988 16' Tahiti SBC  &  1977 18' Dimarco

 


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