Asking for some sbf 302 help

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Asking for some sbf 302 help

Post  tiger on October 22nd 2012, 10:09 pm

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.


Last edited by tiger on October 22nd 2012, 10:11 pm; edited 1 time in total (Reason for editing : Spelling)

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Re: Asking for some sbf 302 help

Post  whitefield on October 22nd 2012, 11:25 pm

What is the intended use ? How many rpm weight of vehicle gear ratio tire size?
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Re: Asking for some sbf 302 help

Post  richter69 on October 22nd 2012, 11:32 pm

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.
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Re: Asking for some sbf 302 help

Post  LivermoreDave on October 22nd 2012, 11:39 pm

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

Dave.

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Re: Asking for some sbf 302 help

Post  dfree383 on October 23rd 2012, 12:48 am

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.
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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 23rd 2012, 4:22 am

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...


Last edited by QtrWarrior on October 23rd 2012, 9:35 am; edited 1 time in total
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Re: Asking for some sbf 302 help

Post  tiger on October 23rd 2012, 9:31 am

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.

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 23rd 2012, 9:39 am

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...
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Re: Asking for some sbf 302 help

Post  whatbumper on October 23rd 2012, 11:30 am

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.


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Re: Asking for some sbf 302 help

Post  Paul Kane on October 23rd 2012, 12:27 pm

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.



Cool

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Re: Asking for some sbf 302 help

Post  tiger on October 23rd 2012, 12:37 pm

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?

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 23rd 2012, 12:39 pm

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...
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Re: Asking for some sbf 302 help

Post  tiger on October 23rd 2012, 12:41 pm

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?

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 23rd 2012, 12:41 pm

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.



Cool

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I'll have to remember this !!! Cool
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Re: Asking for some sbf 302 help

Post  Paul Kane on October 23rd 2012, 12:45 pm

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
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Re: Asking for some sbf 302 help

Post  jbozzelle on October 23rd 2012, 1:53 pm

Mikey

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

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 23rd 2012, 4:15 pm

John,

Check your thread...I'll put it there..
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Re: Asking for some sbf 302 help

Post  tiger on October 23rd 2012, 11:46 pm

Can we get a link to that thread?

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 24th 2012, 4:21 am

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

It's in the General discussion forum..
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Re: Asking for some sbf 302 help

Post  DanH on October 24th 2012, 7:08 am

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

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Re: Asking for some sbf 302 help

Post  tiger on October 24th 2012, 9:25 am

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?

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Re: Asking for some sbf 302 help

Post  dfree383 on October 24th 2012, 9:58 am

They have 351W bolt hole diameters, ARP / Ford Racing makes a bolt and washers kit to put the heads a 302 block.
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Re: Asking for some sbf 302 help

Post  DanH on October 24th 2012, 9:33 pm

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

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Re: Asking for some sbf 302 help

Post  tiger on October 27th 2012, 6:50 pm

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.

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Re: Asking for some sbf 302 help

Post  QtrWarrior on October 27th 2012, 7:54 pm

Factory style lifter and factory "spiderweb"..
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