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View Full Version : 427 or 454 bbc in a jet boat??


smokinflatties
04-23-2007, 06:41 AM
can a 427 make the tork of a 454 or not worth the time its a 350 pd cp tunnel , i found a 427 short block & steel crank for $600 ,cant find 454 short block ?
ck7684
04-23-2007, 06:46 AM
What do you plan on using it for?? Sounds like a good deal to me. I dont think there would be a drastic difference in torque, and the 427 would be better for higher rpm with lower piston speeds...more cubes is always nice too tho...
smokinflatties
04-23-2007, 07:08 AM
run about 11o mh whit a sg 3 pump:confused:
ck7684
04-23-2007, 08:38 AM
I'd go with the 427...if not let me know who's selling that one :D
Jetaholic
04-23-2007, 08:41 AM
All a 454 is is a factory stroked 427. The 427 has 3.75" stroke while the 454 has a 4" stroke. The bore is exactly the same, so I'm assuming it's the same exact block.
You could probably make it into a 454 by replacing the crank with a 454 crank if you wanted to.
smokinflatties
04-23-2007, 08:49 AM
All a 454 is is a factory stroked 427. The 427 has 3.75" stroke while the 454 has a 4" stroke. The bore is exactly the same, so I'm assuming it's the same exact block.
You could probably make it into a 454 by replacing the crank with a 454 crank if you wanted to.
yes and no a 454 block can go 427 but a non cleneced 427 block cant go 454 is what a under stand ,i havent seen ths one yet so i dont know if it is
Jetaholic
04-23-2007, 09:12 AM
I believe that is correct but don't quote me on it. If this is the case, I'm sure any machine shop can clearance a block for ya.
Aduner2
04-23-2007, 09:19 AM
I had a 427 L88 in a 18.5 Challenger jet for years. Ran really well. CI is hp, how much do you need? Just match the impellar to hp and the boat will run great.
GUGS102
04-23-2007, 10:11 AM
I suscribe to the no replacement for displacement theory. If you decide you want a 454, I have a steel crank just polished if you need one.
At the price of stroker kits, put in a 4.250 and make it a 489 or 496
Gugs
smokinflatties
04-23-2007, 01:11 PM
All a 454 is is a factory stroked 427. The 427 has 3.75" stroke while the 454 has a 4" stroke. The bore is exactly the same, so I'm assuming it's the same exact block.
You could probably make it into a 454 by replacing the crank with a 454 crank if you wanted to.
the 427 is a tall block gen 5 what rod do i use someone said i have to use a longer rod with a standerd 427 piston