Originally Posted by marcink

Hey Tony,

I have a 427 C5 using Darton MID sleeves bored to 4.125. I need to use special Cometic head gasket for Darton sleeves (C5789-040). This gasket has 4.125 bore and is 0.040 thick. I have your AFR 225 heads that I will be putting on very soon. But I started to worry now when I read that a 4.130 gasket is needed for AFR 225 heads. Will I be fine with my Cometic gasket? What problems can I run into if I use it? The next available size for these special Cometic gaskets to be used with Darton MID sleeves is 4.165 which I think would be too large and I would hate to spend more money to get it...

Please advise,
Thanks

Originally Posted by NO5.0

thanks Tony, will you be offering the mock up head to rent for the notching. Also, should i mill the 225s or leave em at 62cc. ill be using the G5x3 cam and adding some n02 to the combo. Thanks again. Also what do you think the pricing will be on these with the 921s on em?

Originally Posted by NO5.0

Its seems that what works for the 205s will work for the 225s. Meaning 59cc, and gasket thickness. The only heads available to use for the piston notching would be the 205s to use as a mock up. Would this work if the cutting tool is for a 208/160 valves? thanks

Originally Posted by Tony Mamo @ AFR

Hey Guys...

First off I would like to address the situation of the larger chamber diameter (4.100) of the 225's on the "stock" 3.900 bore. Besides the fact you MUST use a large bore gasket with ANY 225 install (4.130 minimum bore diameter), it poses no other problems whatsoever, flows well, and will make great power on a stock bore engine build. It is NOT an issue. As soon as some "225" stock displacment engines start putting up big numbers it will long be forgotten about. Every hard running BBC buildup in the country that has not been bored to 4.600 inches has combustion chambers that slightly "overhang" the cylinder bore.

The million dollar question is when will the small chamber (62 cc) versions of the 225's be ready to ship. The answer to that is I don't exactly know....my best guess is that we might start shipping the first wave of 62 cc heads late February to mid-March. Even that guesstimate could prove to be conservative but I certainly hope not. The bottom line is that we are extremely busy and doing the best we can till we get into a much larger manufacturing facility slated for the tail end of 05'.

My best advice to anyone trying to assure they get in on the first "wave" of castings is to contact us directly and get yourselves on the 62cc 225 "Pre-order" list. This list is comprised of people that would have given us a firm order and a deposit had we been willing to accept it. AFR will contact all of the people (and distributors) on this list as soon as Engineering gives Production the green light to start cutting 225's on the CNC machines. Once all of the people on the Pre-order list have been contacted and have their orders placed, we will start placing orders in the "que" based on first come first serve. If your NOT on the "list", the chances of you getting or seeing a 62 cc 225 before the end of March is slim. I anticipate a pretty good demand on the small chamber stuff so plan ahead so you don't string yourself along till the weather starts to break.

I wish I had better news to report regarding delivery times, but for the customers who can put up with the wait, I think the end results will more than justify the delay. I think LEGITAMATE (NO dyno tricks and BS) 500+ RWHP stock displacement PUMP gas engines will become a reality for the guys that take the time to dial in their combinations with the next iteration of AFR's proven "recipe".

Thanks for the support and putting up with the seemingly endless "lead time".


Regards,
Tony Mamo

PS Trust me when I tell you that a big factor in the "delay" was to make sure that even with the different chamber configuration, the 62 cc version was every bit as killer as the 72 cc version. Chamber shapes play a big role in flow figures and accomplising this has been no small feat. Once again, we didn't want to "rush" a product to market simply because you guys are screaming for it....fact is the delay has probably cost us some business but we weren't willing to compromise the end results....and when the smoke clears, it's the "end results" that we will always be judged by.

Originally Posted by Tony Mamo @ AFR

Yes...For that matter you could use a stock LS6 head as well....Same Int. and Exh. centerlines....but without the actual 225 in hand, you will not know how deep to make the notches...

Originally Posted by NO5.0

Tony should i call you?

Originally Posted by SDB

Tony, thanks for the info,,I will probably get a straight edge and some feeler gauges and check to see how high the piston is (if any) out of the bore, I asumed around .010 as well.,...I was using stock .051 3.90 bore GM MLS gaskets, so if I went with the COmetic .040 4.03 gaskets and got the Heads milled from 72 down to 69, that should do the trick....Is it still better to go with the slightly thinner head gasket and some milling of the 72's as opposed to waiting for the 62's and using a thicker headgasket in terms of performance and P-V clearance? I will check pushrod length as well...

Thanks,

SDB

Originally Posted by Tony Mamo @ AFR

You need to run a large bore gasket with ANY 225 head install. We sell an .040 thick version AFR PN 6848. Use that gasket with a 69 cc chamber and you should be good to go at 11.1 to 1 or so. A 62 cc head would increase your CR to over 12 to 1....If you wanted a LITTLE more CR you could just mill the 72 version to 67 or 68. Call me at AFR if you need additional help with this.

Thanks,
Tony