PBWOOD

  • Karma: +0/-0
BBC BUILD
« on: November 01, 2010, 09:32:03 PM »
Couple questions i have a stock 454 block and picked some heads up that are square port and are bigger than the stock ones that i got with the block how do i know what intake i can run and get the most out of those heads.The next question how big should i machine the block.I know it can get expensive but its a budget build and obviously want a bang for my buck..And not the blow up the motor bang.. :banghead: :banghead:Any ideas would help thanks.
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lupo1904

  • Karma: +9/-0
Re: BBC BUILD
« Reply #1 on: November 01, 2010, 09:37:09 PM »
there u go buddy ask some ??????? :beer: :beer: :beer: :beer: :beer:
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GT Jets

  • Karma: +192/-0
Re: BBC BUILD
« Reply #2 on: November 01, 2010, 09:38:52 PM »
Couple questions i have a stock 454 block and picked some heads up that are square port and are bigger than the stock ones that i got with the block how do i know what intake i can run and get the most out of those heads.The next question how big should i machine the block.I know it can get expensive but its a budget build and obviously want a bang for my buck..And not the blow up the motor bang.. :banghead: :banghead:Any ideas would help thanks.

Unfortunately the camshaft has as much of a deciding factor for the intake as the heads, it all needs to work together.

I work it backwards....

Heads chooses the pistons (which determines the C/R). I am an oval port fan to the core if under 5.500 RPM.  :sly:

Cylinder condition determines the bore size (smaller is better for durability due to cylinder wall thickness).

RPM range chooses the camshaft and intake combo, not to mention intention of use and exhaust restrictions....

Welcome aboard BTW... :thumbup:

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

lbhsbz

  • Karma: +29/-1
Re: BBC BUILD
« Reply #3 on: November 01, 2010, 09:49:04 PM »
Define "budget".


The first thing I would do is determine exactly what you've got to work with...post up the block and head casting numbers.

Then, get everything down to a machine shop and have it all cleaned and magged to see if any of it is worth getting excited over.

Then determine what your goals are?  What kind of boat is this going in?  What was in the boat before?  What kind of RPMS did it turn?  What kind of speeds did you see?  what are you hoping to gain from the new motor?  What other parts do you already have on the old motor that you can reuse on the new one if need be?  Do you have a crank?  rods?  rockers?  pistons?

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PBWOOD

  • Karma: +0/-0
Re: BBC BUILD
« Reply #4 on: November 01, 2010, 10:00:56 PM »
well the ideas that i'm throwing around because of research and (simplicity/lack of knowledge) is to get rpm's with a tunnel ram and predator carb.still don't know what kind of cam to make it work.I can put the motor together but can't figure combination's out. :banghead: :mad:
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PBWOOD

  • Karma: +0/-0
Re: BBC BUILD
« Reply #5 on: November 01, 2010, 10:06:50 PM »
the boat it was in before i never got it finish actually was and 18 ft tahiti not sure of year.had a 455 and jacuzzi pump gave it away cause wanted chevy can't stant olds and the conversion was 2 expensive.so here iam this winter triing 2 build the motor then find a whole orsell my wakeboard boat which ill post this weekend and get a jetboat that way.but boats aint sellin so im back 2 square one build one.ill get numbers of motor when i get back in town thanks 4 the input..
 :thumbup: :thumbup: :beer:
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enginedoctor

  • Karma: +7/-0
Re: BBC BUILD
« Reply #6 on: November 01, 2010, 10:51:29 PM »
Combination...combination X BUDGET :)...Iknow a bit about builds gimme a call..I'm on the board. :thumbup:
  • Boat #1: 1970 Horizon Cheby powered Jet
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mash on it

  • Karma: +29/-0
Re: BBC BUILD
« Reply #7 on: November 02, 2010, 09:31:20 AM »
 Re: bbc cam choices...
Reply #6 on: May 22, 2008, 02:40:35 PM Quote 

--------------------------------------------------------------------------------

Quote from: KonaCole on May 22, 2008, 01:20:15 PM
... I was told that the duration on the 292 was a too much for not running headers...


I can't figure this one out. There are no reversion problems with logs, only with headers. 

A 454, 10:1 compression, Comp 292, large oval port heads, all else correct = 500 HP on pump gas.











I know this was an old post, but I really liked that combo in my sled, Pulled 5500+ R's on a WJ pump, GPS'd at 71.8 at laughlin.

Daniel
Mash on it
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CJ/RR 212...under construction  "Pistol Annie"

Motoghost

  • Karma: +0/-0
Re: BBC BUILD
« Reply #8 on: November 03, 2010, 10:22:30 AM »
Those Square port heads are HUGE, you have to run a really big cam and intake to even get those heads to start flowing.

I just got done building my 454 4 Bolt main, Heres the list

.30 over on the block so .30 Over Hyperectectic pistons
.268 comp Marine Cam
Stock cast Oval port heads slightly ported with 427 Corvette valves.
Mellings stock oil pump ( high flow will run the pan dry on high rpms)
Stock port matched intake ( my boat has a covered engine, no room under there)
Heavy valve springs
10 Qt marine pan
Double roller chain
Stock balancer
Stock rods
ARP bolts

I had the Engine built at Bob McKrays performance in Mission Viejo, I didnt touch the thing, Cost me 3000, Estimated 475HP
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1974 Tahiti
Berkeley JG Pump. Jetavator. Hydrolic Place Diverter
(needs a motor) :(

orange bahner

  • Karma: +0/-0
Re: BBC BUILD
« Reply #9 on: November 21, 2010, 08:10:24 PM »
Ok here my build that cost me about $3,500

454 4 bolt Hi Perf block bored .060 over (4.31)
Hi Perf 990 rectangular port heads pocket ported and polished chambers 118 volume
stock rods and crank with ARP bolts (balanced and blue printed)
Keith Black Hyper pistons part#257 25.5cc domes (10.5 cr)
Comp Cams Xtreme Marine xm286hr grind hydraulic roller cam (566 lift 296/302 duration) 112 lobe seperation
Comp Cam roller lifters
Comp Cam one piece push rods
Comp Cams Ultra Pro roller rockers
Comp Cams Springs and retainers
 Cloyes Double roller timing chain
Cloyes Timing cover with cam button
Melling high volume high pressure oil pump
14 quart Dooley oil pan
Edelbrock Victor jr 454r manifold
850 Double pumper holley
per comp cams Cam Quest 6 specs program should produce 647 hp @ 6,000 rpm
615 ft lbs torque @ 5,000rpm  ?
« Last Edit: November 21, 2010, 08:18:55 PM by orange bahner »
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9 out of 10 dentist recommend oral sex

BOOST

  • Karma: +25/-0
Re: BBC BUILD
« Reply #10 on: November 21, 2010, 09:13:27 PM »
    OK smoken deal on the build :thumbup: what kind of MPH and at what RPM?

orange bahner

  • Karma: +0/-0
Re: BBC BUILD
« Reply #11 on: November 21, 2010, 09:50:18 PM »
    OK smoken deal on the build :thumbup: what kind of MPH and at what RPM?

Only got 2 hours on build not ready to HIT IT yet but it sure feels good when so far probably going to change to a b impeller next to get some more rpm out if it as well as soon as I have it broke in I would like to get at least 5 hours before I start turning over 5k rpm
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9 out of 10 dentist recommend oral sex

 


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