Are we comparing apples to apples? Comparably speaking, there's nothing wrong with the LT4s ported by a competent person, and I agree, the AFR's will flow more when worked due to the inherent potential of the casting. Unfortunately, everyone needs to evaluate whether the costs associated with such are warranted - it's not cheap (I'm not as industrious as you), but to some the extra 10~20 (+ or -) cfm is well worth it. Where the AFR has the advantage with more cfm potential are at lifts greater than what cam I will run in my engine, and at a cost I cannot justify for myself.

They are both great heads, and it really comes down to what you want to spend, and what your ultimate and/or immediate goals of the car are.

 

My goal is simple to run a 9 in a 4350lb car!

Im shooting for 11.3-4's at 118-120 mph on motor and 9.80's @ 135-140 mph.

 

The spending part is a major part of my point. the LT4s are not cheap out of the box, and they dont flow great out of the box compared to ported LT1 heads, this means to get the air from the LT4s they need to be ported to go.

I looked up some prices from Scoggins Dickey (which was the cheapest LT4s I could find) and youre not saving any great amounts by Going LT4s over some AFRs. You noted the real big advantages of the AFRs.
Also the LT1 heads are really just a SBC head, no big wizardry there, Alot of local machine shops know how to properly port them and get great results (you just have to ask around and see who does a good job). I realize that not everyone wants to taket he time to learn and port their own heads, but I didnt do anything grand to my small AFRs and the Web site I posted has very good instructions that anyone can do and get the results.

Now if you already have the LT4 castings (like he does) then theres a big savings there, but stepping up to some 210 AFRs raises the bar even greater.

 

I'm in the same boat.

 

Try not to put .'s at the end of URLs

 

Fixed... sorry my cut and pasting added it there for some reason.

 

[QUOTE]Originally posted by Mike TexaSS
[B]Well once i remove my Ported and polished stage 3 LT4 heads they ought to be worth at least 800-1000 dollars and should sell easily.

So your telling us that your not asking us for advice, your gonna sell them and get the other heads., good luck, its your cash.

 

I only said what my heads were worth to justify that there isnt much more cost involved.

But if we are talking a 40-50 RWHP difference in going from LT4's to AFR's then its a no brainer.


I will have flow numbers of my current heads in the next few weeks then my engine builder and I will make the final decision.

I was just asking for opinions of the AFR's,

Also heres a pic of my BeaSSt for your viewing pleasure..

 

I don't think the magnitude of difference will be that severe among comparable heads.

I'd love to see the numbers from your LT4 heads - please post 'em.

BTW, nice car.

 

Well, if you wanting to go that fast, I think it would justify the AFR 227's. That is what Joe has on his car running 9.40s at 140. It would be worth the cash. And with a decent port job, would you get you to your number easily.