afr 165 heads

I was looking at an article today saying that adding afr 165 heads on a stock block will add 100 hp. Well after reading it I decided I would like to do this to my car over the winter. When I was looking at prices I notice the is different size chambers. Would 58cc chamber head make more power than the 60cc head? I would like to keep the c/r low enough to run pump gas. Also my piston are flat top no valve reliefs, has anyone used a piston fly cutter, and how hard is it to use? Any way heres the article I found http://www.carcraft.com/techarticles/116_0307_ford_302_v8_engine_buildup/index.html

 

If you put 58cc heads on a stock 73 engine. Your compression will end up near 9:1
The 60cc heads will not let you achieve better than 8.7:1 73 blocks have a tall deck. This was done to kill compression (smog era had begun).BUt... By virtue of the AFR heads better breathing capacity, you will see a performance gain regardless of nominal compression ratio. If you optimise the engine to utilize the heads to their fullest (cam profile/headers,exhaust/induction)etc...You could build a pretty solid little screamer...

 

To answer your question more directly - the 58CC chambered heads will make more power than the 60CC chambered heads. Their breathing is nearly identical and the higher compression will give slightly more power.
In order to get 100 extra hp you will have to add a new cam and lifters. Your stock cam will not provide enough air flow to increase the hp to the 100 hp mark.

 

Get a cam/intake and go with the non smog 185s.

 

I forgot to mention I have an 88 non h.o. roller motor with a b303 cam in it with a performer rpm air gap intake and e7te head currently on it. I was aslo planning on using 1.7 ratio roller rockers

 

As far as fly cutting its not that difficult, but I'm wondering what pistons you have................ Shouldn't the 88 motor have valve reliefs in it? Or do you have aftermarket pistons?



Theres another method other than buying a flycutting tool involves using a 2.02 valve and some sand paper.


I also agree with above, If you can afford it step up to the 185's. Alot more room to grow and can even be usefule down the road if you plan on a stroker motor, or even a 351.

 

The 302 is from a crown vic that had e6se heads. I guess because the e6 head chambers are so deep ford decided that they didnt need any valve reliefs.

 

Oh ok, I missed that part. Let me look and see if I can find you a how to on another method without buying the fly cut tool, I will post you a link.

 

Trick Flow Twisted Wedge

 

Heres a good article on fly cutting method with some tricks, I'm still looking for the other method but the more I think about it I've only seen that method used on pistons already with valve reliefs that just need a bit of extra clearance. Not putting reliefs into flat tops.

http://sbftech.com/index.php/topic,2124.0.html

 

A VERY true statement once you figure in price of tool, and time to do it.

Also a great cylinder head, the OP should investigate this a bit

 

Here is that other method

http://www.fordmuscleforums.com/engine-articles/484906-another-technique-piston-notching.html

 

Dont the twisted wedge heads need matching pistons to go with them?

 

If you never plan on building a big inch stroker motor, don't waste your money on the 185's.

 

That article has been debated for years. No one else has been able to duplicate the results. Did sell a lot of magazines and heads though...
Stock flat top pistons may not have enough material to add reliefs.