I am getting ready to do some more modifications to the car over the winter. I was just put onto a new set of killer 23* heads that flow in the ~350CFM range with 245cc runners. These puppies blow just about everything out of the water. While they are intended for larger SBC engines they are showing there is very little decrease in velocities meaning there will be little compromised over what I already have. And the added ~40cfm should translate to about 80 more potential HPs.
They are talking to me about being a potential guinea pig for the corvette community to give an honest evaluation of the product.

This gets me back to what some of you may recall me doing in the days of past. Testing new products and reporting the outcome so you all too can benefit from the shared information.

As a result I will be likely trying to offset the cost of these new heads by selling my current heads. The current heads prior to seeing these new heads are top of the line and nothing outflows them in a production setting. They were built by M2 race systems and do not require any special pistons/headers/rocker arms or anything. Just all the standard 23* stuff and your typical flat top pistons with a standard gasket will put you depending on the deck of your block at ~11:1 compression. Springs were just replaced as were the guides last season. The springs are good to any cam less than .800 lift. intake runners are 227cc.

If you have a big inch sbc 383+ I can give you the exact cam I ran and you would be flying with these heads. Put it on any 400+ motor and you should be in the very low 10s at about 600hp n/a. You will not suffer any loss of bottom end power with these heads either. My car pulls consistent 1.33 60ft times and as you can see from the video it gets up and goes pretty good out of the hole. Enough to light the street tires up at 70MPH without much effort.

Right now my car runs 10.0X nearly every pass and I can give you videos from running the car this past weekend with these heads.

The M2 heads flow 309CFM which is better than any other product head. I have over 2500 in these heads, but pricing is negotiable but need some fair offers. I will also throw in a free custom tune.

IM or email me for details.

I will keep you all posted on the details and new heads that were discussed above as more info becomes available to me.

 

 

Good luck jesse,

pm me some more info, i've been out of the game for a while

 

My AFR 195's flowed 304 box stock. AFR 227's would flow considerably more than those heads.

 

Sounds like hes looking at an AllPro/Profiler head.

 

 

Sorry your comparing apples and oranges. The heads I have are made to work with all the stock components like rocker arms, exhaust ports will match most peoples headers or any headers that is on an L98 motor.

The heads that you allude to above are spread port and are NOT easily put on our cars. Custom headers, not recommened by AFR for use without shaft mounted rockers.

Comparing AFR227 heads to that of M2s there is no comparison, especially when you look at all the valve lift figures.

 

Ski,

I believe the 227's come in either standard or spread port exhaust.

 

With AFR 227's you can get a spread port design if you want, but they also have a standard 23 degree head that doesn't require a shaft mount system, same as the 235's. All you need is a .050 offset intake rocker. You can even get away with standard rockers if it doesn't see alot of street miles. A friend of mine ran normal rockers on some old AFR 220's and didn't have problems. Regardless, .050 isn't alot of offset.

Stock pistons, intake, and headers will all work with the AFR 227 and 235 cylinder head.

Since both heads use the same 23 degree stuff, it looks pretty apples to apples to me.

AFR's entry level (non-competition port) cylinder head (P/N 1067 or 1068 depending on chamber size) flows the exact same peak number you are quoting, 309 CMF; and 233 CMF on the exhaust side. I would bet dollars to doghnuts that the sub-peak flow numbers are superior on the AFR heads as well. All for a retail price of less than $1600. Call any number of AFR dealers (tpi421vett would be a good choice) and I'm sure they can smash that retail price.

Since AFR redesigned their heads, the new 220's are flowing 326 peak CFM. That's nearly 20 more than your heads. Beyond that, with your heads whoever buys them is stuck with whatever CC combustion chamber you've chosen, or less CC if they are willing to pay for machine work. They can get brand new heads, made the their specs, that flow more, with less port volume, and most likely for less total investment.

309 CFM out of a 220+ CC intake port might have been great a decade ago, but anymore that type of flow just isn't that spectacular.

Maybe there is more to it than flow numbers, maybe not, I don't know. In the world of flow numbers, the heads you are selling (by todays standards) are pretty marginal, especially for the price you are asking.

What MPH did your car trap with these heads?

 

Did you ever run these heads on something smaller than your 434?

 

Do you still have your c4