Help with new combo

Hi Guys I'm looking at building a new BBF combo to replace the 351 cleveland in my 1968 Falcon (Australian 4 door). I'm after advice on my proposed combo if you all think its a good combo and if it will reach my intended goals!
I'm wanting to build a 557cu motor and i'm hoping for 950hp all motor running about 12.5-12.8 comp. My ideas on parts are
BLOCK: A460 svo
HEADS: A460 trickflow (with shaft mount rockers)
CRANK: Scat 4340 forged not shore on stroke as yet.(Any advice)
RODS: Crower pro billet not shore on length as yet. (Any advice)
IGNITION: MSD crank trigger
TIMING: Danny Bee
INLET:Not decided yet hoping to use either TFS A460 tunnelram or single four(Any pro's and cons to either)
CARBY: Holley Dominator 4500 not shore on CFM depends on intake
CAM:Solid roller not shore on brand or size as yet(Any ideas would be great)

I'm also planning on running a moroso vac pump and a paterson external single stage oil pump with a wet sump.

Any advise on this combo would be great! I'm hopeing to run into the 8's on the 1/4mile in my falcon that weighs 3200 pounds

why 557?
and not 598

sounds good,crower 6.8 rods and one carb,IMO.

I'd think at least 4.5 x 4.5" = 572"....or more .
One modified 1250 will make a ton of power.........why only 12.5/1 comp ratio?

Lem Evans wrote:I'd think at least 4.5 x 4.5" = 572"....or more .
One modified 1250 will make a ton of power.........why only 12.5/1 comp ratio?

12.5:1 comp so as i can run on pump fuel (98octain in Australia) What length rod would you use in a 572" motor?

Is the power level we are chasing doable with on carby? How much gain can be made with going to a A460 tunelram? Is it worth the cost of the extra carby?

IMO, your goals can be reached with a single carb set-up. Also IMO, the extra carb and tunnel ram is not worth the extra money unless you're going to bump your compression, and make it a race only app. In the latter case, this thing would make a TON of power. I also believe that there is nothing wrong with your C.I. needs. But for the same money (for the most part) you can go with something in the 600" range. Good luck however you go.







Doug...

i would go with a 6.8 rod

I guess I'm too simple. I find a stroke I like and a good piston design and use whatever rod that will connect the two.

ThndrChkn wrote:IMO, your goals can be reached with a single carb set-up. Also IMO, the extra carb and tunnel ram is not worth the extra money unless you're going to bump your compression, and make it a race only app. In the latter case, this thing would make a TON of power. I also believe that there is nothing wrong with your C.I. needs. But for the same money (for the most part) you can go with something in the 600" range. Good luck however you go.







Doug...

Will a A460 block go 600 cubes? or is that pushing it a bit to far?

boss56 wrote:

ThndrChkn wrote:IMO, your goals can be reached with a single carb set-up. Also IMO, the extra carb and tunnel ram is not worth the extra money unless you're going to bump your compression, and make it a race only app. In the latter case, this thing would make a TON of power. I also believe that there is nothing wrong with your C.I. needs. But for the same money (for the most part) you can go with something in the 600" range. Good luck however you go.







Doug...

Will a A460 block go 600 cubes? or is that pushing it a bit to far?

Certainly will. Or 598" at least.(4.600" bore X 4.500" stroke). As Lem had asked though, why the low compression ratio/pump gas requirement? The A heads like compression and compression is power. Or is this going to be street driven as well? Or is it a case of race gas being to expensive? Just wondered, I'd loose the pump gas requirement and bump the compression.

4.5 x 4.6 = 598" and do one of TFS's single 4 intakes with a 1250-1450 dominator.

Get the heads fully ported and have Lem get you a cam.

My current 528" motor is a little over 12:1 and made 905 on race fuel with a single 4.

.








Will a A460 block go 600 cubes? or is that pushing it a bit to far?[/quote]

My Sonic check on my A460 block says it will go 608c.i. safely

Nevs wrote:

boss56 wrote:

ThndrChkn wrote:IMO, your goals can be reached with a single carb set-up. Also IMO, the extra carb and tunnel ram is not worth the extra money unless you're going to bump your compression, and make it a race only app. In the latter case, this thing would make a TON of power. I also believe that there is nothing wrong with your C.I. needs. But for the same money (for the most part) you can go with something in the 600" range. Good luck however you go.







Doug...

Will a A460 block go 600 cubes? or is that pushing it a bit to far?

Certainly will. Or 598" at least.(4.600" bore X 4.500" stroke). As Lem had asked though, why the low compression ratio/pump gas requirement? The A heads like compression and compression is power. Or is this going to be street driven as well? Or is it a case of race gas being to expensive? Just wondered, I'd loose the pump gas requirement and bump the compression.

Yes the car will be street driven aswell. I was thinking this way if i ever want to step it up i can dump the comp up later and turn it into a race only deal! I'm starting to look at the bigger cubes as i guess there easier HP! If you where going to run more comp how high would you go? I think i can run upto 13.5 with VP109 race unleaded fuel. Thanks for all the advise everyone!

boss56 wrote:

Nevs wrote:

boss56 wrote:

ThndrChkn wrote:IMO, your goals can be reached with a single carb set-up. Also IMO, the extra carb and tunnel ram is not worth the extra money unless you're going to bump your compression, and make it a race only app. In the latter case, this thing would make a TON of power. I also believe that there is nothing wrong with your C.I. needs. But for the same money (for the most part) you can go with something in the 600" range. Good luck however you go.







Doug...

Will a A460 block go 600 cubes? or is that pushing it a bit to far?

Certainly will. Or 598" at least.(4.600" bore X 4.500" stroke). As Lem had asked though, why the low compression ratio/pump gas requirement? The A heads like compression and compression is power. Or is this going to be street driven as well? Or is it a case of race gas being to expensive? Just wondered, I'd loose the pump gas requirement and bump the compression.

Yes the car will be street driven aswell. I was thinking this way if i ever want to step it up i can dump the comp up later and turn it into a race only deal! I'm starting to look at the bigger cubes as i guess there easier HP! If you where going to run more comp how high would you go? I think i can run upto 13.5 with VP109 race unleaded fuel. Thanks for all the advise everyone!

Bigger is better, especially since you are buying the parts. Crankshaft is basically the same money whether it's a 4.300" stroke or a 4.500". Pistons, same deal. I'd go for as much compression as the gas will support. If I told you how much compression we ran in our A head 557" combo, you probably wouldn't believe me, but it sure liked it and ran in the 7's as well. Given the street duty, I'd err on the side of safety.

You could bump up to the 4.75 crankshaft.



Ps. Depends if your on a budget.

I'm on a budget but not a tight one! I have about 18-20,000 us to spend and i will be buying all the parts from the states as there heaps cheaper then here in Australia! My main reson for the smallish stroke is i want to run in a class in Australia we call mod street asperated not too many restrictions on the engine except alloy blocks but thats no prob but we can only run a max tyre of 28/12.5! Our national top ten is filled with mainly chevy powered holden toranas and they run hugh strokes up in the mid 600's but all seem to only make about 800-900hp asperated and run mid 8's my mate and i think we can run similar times with the BBF but run pump gas as we have seen plenty make really big power over there in the states so we want to show them a thing or two if we can

Well, your on a good start. As long as you know where you need to be hp wise. What type of drivetrain are you going to be running? What is your cars weight and where do you need to be in ET?

jones wrote:Well, your on a good start. As long as you know where you need to be hp wise. What type of drivetrain are you going to be running? What is your cars weight and where do you need to be in ET?

Hp we're thinking 950 or there about and trans wise either a powerglide or turbo400 leaning towards the turbo400 as i think the 3 speed will help get it down the track easier! at present the car weighs 3200 pounds but i have put it on a diet and should get it to around 3050 pounds! At this power and weight i think it should run about 8.60@150mph or thats what we are hoping for! But if i need to run more cubes i will but want to be able to run pump fuel as some of our shoot outs require us to do a street cruise before racing to prove it is in fact a street car!

If you want to run less than 4.5" stroke.........
4.50 x 4.3 = 547
4.53 x 4.3 = 554
4.56 x 4.3 = 562
4.60 x 4.3 = 572
At 3,050# I'd run the glide.

Lem Evans wrote:If you want to run less than 4.5" stroke.........
4.50 x 4.3 = 547
4.53 x 4.3 = 554
4.56 x 4.3 = 562
4.60 x 4.3 = 572
At 3,050# I'd run the glide.

not a damn thing wrong with a 4.3 crank, and yes run the glide............

Lem Evans wrote:If you want to run less than 4.5" stroke.........
4.50 x 4.3 = 547
4.53 x 4.3 = 554
4.56 x 4.3 = 562
4.60 x 4.3 = 572
At 3,050# I'd run the glide.

Thanks for that info! We have been thinking about it and think we will go with 572cubes? Also why the glide? What advantages does it have over a turbo400?

thought i would put a pic of the car up!

boss56 wrote:

Lem Evans wrote:If you want to run less than 4.5" stroke.........
4.50 x 4.3 = 547
4.53 x 4.3 = 554
4.56 x 4.3 = 562
4.60 x 4.3 = 572
At 3,050# I'd run the glide.

Thanks for that info! We have been thinking about it and think we will go with 572cubes? Also why the glide? What advantages does it have over a turbo400?

Glide is more forgiving at the launch. Turbo 400 has too much torque multiplication at the hit, small tire=spin. Regardless of what you've heard or been told, to make a turbo 400 bullit proof ain't cheap.We've had good luck with both the 1.76 and 1.80 low gear in the glide, little or no difference in performance. Couldn't give me a turbo 400......At that horsepower level you don't need 3 speeds to get moving....

But for real street use the 3speed could have some advantages.