Asking for some sbf 302 help

I know this is not a sbf website, but I know a lot of you guys have experience with sbf. If I am in wrong section feel free to move thread.

I have to run steel heads on this engine and they can be aftermarket. I was thinking either World ford Windsor Sr. Heads or Ford Racing N351 Sportsman heads. I know the N head takes special rockers and longer pushrods, but I have to buy all that anyway with either head choice. I know the N head moved the valves, can't find any info on if it needs different pistons tho.

The parts i was thinking stock roller cam block with stock 2 bolt main caps, using ARP studs on main caps, a steel main girdle, windage screen, stock crank, scat 4340 I-beam rods, JE forged 18cc dome pistons, TFS hydrolic roller cam .575 in. lift and .595 ex. lift - duration at .050 is 236 in. and 248 ex. - LS is 110 deg., rocker arm girdle, using SFI flywheel and dampener both 0 balance and making it internally balanced, intake is a victor jr, carb is 750 holly dp.

Any input on head choice or any problems with build before I take to machine shop? All I have purchased is cam, rods, block, crank, intake, distributor, carb. This is race only engine.

What is the intended use ? How many rpm weight of vehicle gear ratio tire size?

Im getting a class together next season thats similar to this, less than 360", iron heads, single entry spraybar plate etc.

I have a 306 right now that made 538 on the dyno n/a w a set of wp 200 heads, just a bowl blend etc, 12.8-1, decent size solid roller etc. This motor has a forged crank and aftermarket block....... I have a stock block deal w AFR 205's that made 555....... its a grenade, the block will split eventually. The main studs are find but dont waste money on the girdles it wont help the block splitting lol.

Use the "N" head and don't look back! Might want a quality block too.

Dave.

what about 4v Cleveland heads on a Aftermarket Windsor Block?

IMO you already know your wasting your time with the factory roller block with NO2.... Best to at least spend a little extra on the block and get something that is going to live, its just not worth wasing good parts on a grenade.

LivermoreDave wrote:Use the "N" head and don't look back! Might want a quality block too.

Dave.

X2

We run the N head on our dirt track stuff..The intake valve is moved over .150", We use "regular" pistons, as the N head has a 10* angle, instead of a 20* angle.
We haven't had to cut any notches and have had plenty of Piston to valve clearance.
If I remember correctly... The N head has the Windsor Sr covered out the box as far as flow.
And when you port them...no contest...

Thanks guys! It's too bad you can't stop the sbf from splitting blocks. Wish they were more like a bbf block, talking stock blocks here.

tiger wrote:Thanks guys! It's too bad you can't stop the sbf from splitting blocks. Wish they were more like a bbf block, talking stock blocks here.

Our latest dirt motor is running a '74 model 351W block. It's .040 over and has nothing "special" done to it..
That being said, it's all about the details...Good machine work, good prep work, good tune-up...

I have made over 600 with 2v aussie heads on a 351 but in this case I would run cnc'd RHS iron heads from Brzezinski Racing Products.

Mine flowed around 315cfm and used all regular style rockers and such.

The N heads do look good though.

Anyone that uses the N351 or Z304 heads with the 0.150" offset intake valve:

We have the 0.150" offset rocker arm sets, 7075-T6 rocker body material, 8620 billet steel trunnion, top quality bearings (same supplier as for Jesel, etc), 1.6 or 1.7 ratios, chromoly poly locks.





Paul

Paul you are the man, I know who to call now instead of a magazine vendor. Are there any vendors on here that sell the N heads so I can get them from a vendor on here instead of someone else?

tiger wrote:Paul you are the man, I know who to call now instead of a magazine vendor. Are there any vendors on here that sell the N heads so I can get them from a vendor on here instead of someone else?

I got 1 of my sets from Lem...

I know a 1.7 rocker will produce more lift on a cam over a 1.6 rocker, but does it give it more duration also?

Paul Kane wrote:Anyone that uses the N351 or Z304 heads with the 0.150" offset intake valve:

We have the 0.150" offset rocker arm sets, 7075-T6 rocker body material, 8620 billet steel trunnion, top quality bearings (same supplier as for Jesel, etc), 1.6 or 1.7 ratios, chromoly poly locks.





Paul

I'll have to remember this !!!

tiger wrote:I know a 1.7 rocker will produce more lift on a cam over a 1.6 rocker, but does it give it more duration also?

Seat-to-seat duration remains the same; however area under the curve changes.

Paul

Mikey

Spill the beans on your N headed combo if you don't mind. Can they use typical off the shelf headers?

John,

Check your thread...I'll put it there..

Can we get a link to that thread?

tiger wrote:Can we get a link to that thread?

It's in the General discussion forum..

jbozzelle wrote:Mikey

Spill the beans on your N headed combo if you don't mind. Can they use typical off the shelf headers?

header flange bolt pattern is wider

Are the head bolt holes for a 351 head bolt or 302 head bolt on the N head. If they are 351 hole what head bolts do you use for a 302?

They have 351W bolt hole diameters, ARP / Ford Racing makes a bolt and washers kit to put the heads a 302 block.

tiger wrote:Are the head bolt holes for a 351 head bolt or 302 head bolt on the N head. If they are 351 hole what head bolts do you use for a 302?

for a 302 , N head would be a very good head . small port that flows well . being iron , kind of a sleeper

Can someone tell me if I can use a factory style roller lifter with factory parts or do I need the after market style roller lifters with tie bars? Cam specs are in original post.

Factory style lifter and factory "spiderweb"..