WTK: 347 Stroker, are my heads too small?

Before I bolt my Trick flow heads on, I need to know if they will hold me back from optimal HP.
http://store.summitracing.com/partdetail.asp?autofilter=1∂=TFS%2D51400002&N=700+ 4294908331+4294925232+115&autoview=sku

Some engine specs:

PBM forged crank
PBM rods
JE dished pistons
Lunati roller cam (560 lift)
Weiand 174
TFS 170cc aluminum heads 2.02/1.60/61cc
Cometics
Carb: Have brand new ProForm 750 now but need to get a blower carb.
Ford racing shorties
toploader 4 speed
9" with 4.11 now will switch to 3.73

Any recommendations?

With that cam, blower, and a 4 speed, I would think that if you want optimal HP, you should look at stepping up to something with atleast 185 or 190cc runners (such as the AFR 185's).
That being said, I'm sure you can still make lots of power with the heads you have, but if you are in a position to exchange them, I would go with the bigger runners.
Take a look at AFR Cylinder Head Articles: Aluminum cylinder head manufacturing and flow dynamics and go to Small Block Ford Articles. You'll find a lot of good head comparisons and build ups there with dyno results.

Originally Posted by valleyfirearms

Before I bolt my Trick flow heads on, I need to know if they will hold me back from optimal HP.

http://store.summitracing.com/partdetail.asp?autofilter=1∂=TFS%2D51400002&N=700+ 4294908331+4294925232+115&autoview=sku

Some engine specs:

PBM forged crank


PBM rods


JE dished pistons


Lunati roller cam (560 lift)


Weiand 174


TFS 170cc aluminum heads 2.02/1.60/61cc


Cometics


Carb: Have brand new ProForm 750 now but need to get a blower carb.


Ford racing shorties


toploader 4 speed


9" with 4.11 now will switch to 3.73

Any recommendations?

I recommend Trickflows cnc ported head. Great head. I would use their smaller cnc head.
Brian

I think the lower priced TFS have cheap valves in them when bought as a package, and you could end up breaking them, when reving above 6000... which should be easy with your setup.

Are you using a blower? The only mention is the Blow Through Carb you want to use. If not, use fel-pro head gaskets.

If you are going with a blower, your compression maybe too high, heads too small, and make sure you are very carefull about torquing the heads down with those Cometic gaskets... if it is not done right, you will have problems there too..

Without a blower and the right heads/cam, you can easily make 450 HP with the carb you have. SBF will split in half over 500 HP, unless you use an aftermakret block.

Mike you are correct on the cheap valves as I have done that already. Lost a good engine because of their 2 piece valve

Originally Posted by Mikes66

If you are going with a blower, your compression is too high, heads too small,

It depends on the size of the dish in the pistons. Do you know the compression ratio using your JE dish pistons and 61cc chambers? As mentioned, you may need larger combustion chambers to get your compression low enough to work with your pistons in a blower application.

What kind of power are you looking to make with this build? If you are planning on going into the 500 to 600 HP range, Mike makes a good point, you will definately want to consider the strength of your 302 block. A stud girdle will not keep the webbing in the block from splitting, and there is much debate about whether or not valley girdles really help this issue or not.

Yes, I am going with the weiand 174 blower. I am concerned that the ProForm 750 is not the right carb. Some say it will work and others say I need a blower carb. I hope to make 450hp, more will be a bonus or a boner(depends if I do split the block). The pistons are flat top JE's. The 347 was blown before and the compression was 8.5:1 with factory cast iron heads. Also ran into a problem today. This is the second set of Clevite rod bearings that are wrong. If you are hold the cap and looking down at it the groove is on the left. All the bearings that I have ordered are on the right. The third set with a different number is on it's way. Also the damn MSD 8582 I did the steel gear conversion to is too short! I compared it to the factory stock dist and the shaft is about an inch shorter. Live and learn I guess.

Originally Posted by valleyfirearms

I hope to make 450hp, more will be a bonus or a boner(depends if I do split the block). The pistons are flat top JE's. The 347 was blown before and the compression was 8.5:1 with factory cast iron heads.

The factory heads must have had larger chambers than your 61cc heads you have now! Flat tops with those heads in a 347 make a lot more compression than 8.5:1. Even if you have large valve reliefs around 11cc's, you are still looking at close to 10:1. You said dish tops in your original description which is what you will need for your blower. It will take somewhere in the neighborhood of an 18cc dish to get down to 8.5:1 with 61cc chambers.
Besides, if you are looking for 450HP, you can easily get that out of a 347 without a blower! However, since you have the blower (and blowers are definately cool!) you can get to your 450HP mark with a pretty mild cam and your heads, but you will need different pistons.
As far as the carb, you can always call up the guys at Holley/Weiand and get their recommendation.

I'm not sure of the relief size but here are a few pics. As far as the carb goes, I'll have to call because Pro-Form and Weiand had not replied to my numerous e-mails. I appreciate all the input.

Looks like a nice ride this thing is going in!
Unfortunately, it looks like you are going to need either different pistons or larger chamber heads in order to use your blower. Those appear to be flat tops with pretty large valve reliefs, but you are going to need dish tops.
While you are on the phone with the Holley/Weiand guys, you might want to ask them about what pistons and compression they recommend for that blower.
Good luck with it and let us know what you end up doing.