What bbf combo do I need to.........

get a 3250 pound foxbody coupe into the mid 5's with nitrous (~250 shot) assist? I have a complete 69 460 w/C6 to start with. I have a well set up car, just not the powerplant to utilize it, it runs consistently in the 6.5x's with an all motor, stck block, cast crank 408W at 3000 pounds. I'm sure I'm pushing the limits of the 408W and can't bring myself to put the nitrous to it. Rather than build another stroker windsor that is up to the task, I'm strongly considering the bbf route. I'm thinking of something in the 521 range or as big as I can go and safely spin to ~7000. Would the ford racing scj aluminum heads fit the bill, or the tfs powerport 290's? I'm open to going through a specialist to provide the heads, properly setup to match a cam package. is a forged crank needed at this point? time for a 4-bolt main cap upgrade? what compression will I need? I will use what ever fuel is required, but hoping it can be done with 12:1 comp or less. Thanks.

I've flogged a 2-bolt D9 block in the 5's for years. Runs happily on pump 93, but at a much lighter weight. Obviously, you can do it with common 2-bolt stuff...but for how long? Since you're going to the hose with a heavier car, a good block is pretty much a no-brainer. I figure the SCJ heads would be a good choice, too.

I'm a fan of lightweight cars, tho. They go fast cheaper and they're easier on parts. Do you NEED to weigh 3250?

Nastynotch wrote:get a 3250 pound foxbody coupe into the mid 5's with nitrous (~250 shot) assist?  I have a complete 69 460 w/C6 to start with.  I have a well set up car, just not the powerplant to utilize it, it runs consistently in the 6.5x's with an all motor, stck block, cast crank 408W at 3000 pounds.  I'm sure I'm pushing the limits of the 408W and can't bring myself to put the nitrous to it.  Rather than build another stroker windsor that is up to the task, I'm strongly considering the bbf route.  I'm thinking of something in the 521 range or as big as I can go and safely spin to ~7000.  Would the ford racing scj aluminum heads fit the bill, or the tfs powerport 290's?  I'm open to going through a specialist to provide the heads, properly setup to match a cam package.  is a forged crank needed at this point?  time for a 4-bolt main cap upgrade?  what compression will I need? I will use what ever fuel is required, but hoping it can be done with 12:1 comp or less.  Thanks.

You won't NEED 4 bolt mains or a steel crank for high 5 second power. It would be nice insurance to have if you have intentions for nitrous. Then, I would buy an A460 block with a steel crank and forget about it.
A 521 with SCJ un-ported heads from FRPP but, with a good valve job along with a ported Victor manifold and a "correct" camshaft will get you over 750 horsepower at about 6,800 RPM; 800 if you really lean on it.

It's for class racing, BB naturally aspirated 3050 lbs, BB nitrous 3250. BB restricted to "stock bock", i.e. it has to be a ford production block......internal mods okay such as aftermarket 4-bolt main caps. Thanks, keep it coming.

Yeh, I figure the whiff of nitrous will more than make up for the 250 lb. handicap. If it's gotta be a production block, I'd do the 4-bolt deal and fill it. Do these rules allow A-heads?

W/spray.....a forged crankshaft would be a lot of comfort.

^^^^^^^^What he said.

maverick wrote:Yeh, I figure the whiff of nitrous will more than make up for the 250 lb. handicap.  If it's gotta be a production block, I'd do the 4-bolt deal and fill it.  Do these rules allow A-heads?

TFS A460 heads are legal, if those are the heads your talking about.  Still not up on all the bbf references and nomenclature.

here's the list of "approved" 460 heads:

• Ford Factory OEM Iron & OEM Aluminum (2 bbl. & 4 bbl.)
• Ford 429/460 Aftermarket Cobra Jet Cylinder Heads
• Blue Thunder 460 “OEM Cobra Jet Style” Only. THOR & Other Versions Prohibited.
• Trick Flow A-460 – PN# TFS-21002, 5441B001, and 5451B001
• Edelbrock Performer RPM 460, Performer RPM 460 CJ, Victor Jr. 460

Good blocks are illegal but A460 heads are legal....the rules get dumber ever year.

No matter what the class rules, you SAID mid 5's in the eighth mile and you don't NEED all that to go that quick.
To go near the 4's probably will need over 1,000 horsepower ... IF the car is RIGHT.

EDIT: NO question ... "A" heads for sure.

rmcomprandy wrote:No matter what the class rules, you SAID mid 5's in the eighth mile and you don't NEED all that to go that quick.
To go near the 4's probably will need over 1,000 horsepower ... IF the car is RIGHT.

Pretty much what I'm asking, what does it take to get to my goal? Then again, once I reach that goal, i'll probably want to go quicker, lol!

Like Randy said, A-heads for sure...especially if you plan to go faster later on.

BTW, a decent A-head combo will get you there without the bottle.

maverick wrote:BTW, a decent A-head combo will get you there without the bottle.

good to know. just what do you mean by a decent A-head combo? Intake? Compression? cubic inch?

Without being specific, there are A-head combos around this board that make 1000 n/a h.p. and more without too much trouble. Do a little search and you'll see what I mean. IMO, If you're serious about running ths class and you're not cubic inch limited, I'd go with A-heads and go big. BTW, you already have a couple of our best engine builders involved in this thread. 

X2 on everything he said. 

I have a 521 with super cobra jet heads , scat crank , eagle rods  , diamond pistons  ,nx plate in a 2000 mustang 3340#,373 gear c6 stock suspension , m/t  275s  5.75@121 last week at bristol

This is a nice thread, looking to do the same thing. BBF on spray, stock style suspension, and 275's. I hope the info continues to roll on this. I have a lot to learn. But all these guys arr sheading a lot of light for me to learn from.

I have a scj headed 547, I've been 5.37 at 3250lbs with 300 shot progressed 2 seconds out.

There wouldnt be a certain bbf capri you coming after is there? If you want to know anything feel free to stop by I will tell you whatever you want. I have pretty much switch to 275s but still holding on to a set 8.5s for some of the outlaw stuff around here.

nitro717 wrote:There wouldnt be a certain bbf capri you coming after is there? If you want to know anything feel free to stop by I will tell you whatever you want. I have pretty much switch to 275s but still holding on to a set 8.5s for some of the outlaw stuff around here.

Shhhhhhhhhh!!! Trying to keep my plans low key, anyway just in the planning stages right now. The series will probably be defunct or the rules will have changed by the time I get it rolled out anyway. LOL! I just want to go fast/quick. I still remember how happy I was just to break into the 7's, then the 6's, now shooting for mid 5's.

v-twin wrote:I have a 521 with super cobra jet heads , scat crank , eagle rods  , diamond pistons  ,nx plate in a 2000 mustang 3340#,373 gear c6 stock suspension , m/t  275s  5.75@121 last week at bristol

Not to hijack the thread but is this combo "street able"?