Big - Small Block or Small - Big Block Question

[pullmytrigger]

I am working with the Furniture Row Nascar Team right now and I am building 2- 434ci small blocks using the Dart raised deck and raised cam block. I am using their SB-2 heads right off their car engine. I also am putting fuel injection right on their Intake manifold also. The engine will 9.1 compression to run on pump gas.

at 434 and FI they must be for something other than the racecar......

 

[HaxbySpeed]

we are running them between 5000 and 7300 rpm 90% of the time

SWEET!! That must sound awesome! Are you spinning those rpms on a stock rotating assembly? Cools pics too, thanks for sharing.

 

[shifter]

http://www.youtube.com/watch?v=DINWsjuh

The sound is great. Nothing like it.

Block/crank/rods/heads/springs/valves stock.

pat W

 

[MikeyFIN]

Keep in mind, hes talking cubic inches here not horsepower. a 454 small block can theoretically have the same torque as a 454 big block. The question was on longevity and cost I think.

Wroong....

The question is any big block head ( except the 330 Merc/Truck peanut heads) flow better than most Good smallblock heads.
The Small blocks are around 200cc ports ( intake) and the smallest bigblocks are at 280.

Giving my choice I´d go with a regular 454 or a stroker kit to make a 496 have old big oval ports opened to the rectangular valves ( 2.19-2.25 intakes 1.88 exhaust) a stout roller cam and voilá easy 600hp engine for even RV or Marine use...

 

[MikeyFIN]

You can't compare apples and oranges. If you had a 454 big block vs a 454 small block and both had same compression ratio setups and equally equipped etc., etc., and were in the same boat, the small block should win the race hands down every time because it's much lighter in weight than the big block. There are so many facets to this argument that you could go on forever, but I remember back in the 70's when Smokey Yunick built a 208 cubic inch small block Chevy for Indy that had something like 900 horsepower, and they don't lift the throttle at Indy for 3 hours. Anyone that would argue a small block won't hold up to endurance hasn't turned on the TV on Sunday's for the last 30 years.

This is a newer ending argument like car vs bike etc etc...

But actually Hot Rod did a few years back with a Camaro a test.
They had a 400 c.i. SBC and a 402 bigblock, both worked about the same regarding compression camshaft degrees and lifts etc etc. Car was the same with same gearing and sofort, different turbine.
The Big block won the ET at the strip by 0.4 seconds or more (?) and the trap speed was higher too.

Regarding SB2 heads and sofort well yes they are something else, like
the LSx engines nowadays whose heads flow more than the best BBC heads outthere. Only the very latest ProStock heads can hold their own to LSX heads.

 

[jeff1000man]

A friend of mine is finshing up a pair of really nice 409's made from Dart blocks and good internals. They are supposed to make 500HP +-

Really am looking forward to seeing what his boat will do now.

 

[MikeyFIN]

A friend of mine is finshing up a pair of really nice 409's made from Dart blocks and good internals. They are supposed to make 500HP +-

Really am looking forward to seeing what his boat will do now.

409´s should make easy 500...

 

[jeff1000man]

409´s should make easy 500...

Bob Madero cut the roller cams for them and he is guessing around 550HP.

Should be real nice motors.