I ordered these based on the info on AFR's website. They are the model 1660s which were supposed to be 72cc chambers. When they arrived, I had them flowed, the spring heights and pressures checked, and the chambers cc'd, which turned out to be 65cc. I can't use them after waiting over 2 months to get them. It seems that there are no small bore 72cc chambers models. After waiting over 8 weeks, I am more than a little disappointed.

AFR, FIX YOUR WEBPAGE

Sorry for the rant, I am better now.

Here is all the pertinent information:

Intake valve - 2.08
Exhaust valve - 1.60
Installed spring height - 1.8"
Spring pressure - seat 140lbs .600 lift 360 lbs
Coil bind - .730 lift
Chambers - 65cc

CFM
Lift Intake Exhaust
.200 143.5 112.5
.300 201.5 168.0
.400 252.0 198.5
.450 274.0 207.5
.500 294.5 217.0
.550 310.0 222.0
.600 319.0 225.0
.650 320.0 230.0
.700 299.0 231.5
.750 294.5 233.5

Like I said, these are brand new and the numbers speak for themselves. I will not take a big hit on these, but you can save a little money and a lot of time, as AFR is still about 8 weeks backlogged.

$2400 + shipping. Serious inquiries only.

Willing to drive up to 200 miles to meet up with anyone wanting to save on the shipping charges.

I need these gone quick so I can order some heads with the right chamber size.

Thanks, guys.

 

have they ever been on the car at all. also what is your rock bottom price I live about 4 hours from you perhaps we could work something out. shoot me an email with your number mbrunkerjr9@bellsouth.net

 

I just picked these up at the machinist today. Email sent.

 

why do you call AFR and tell them to replace them, it is there fault if the info was wrong.

 

There is nothing to replace them with. There is no AFR 225 small bore 72cc chamber heads, they don't make them. It is probably possible to send them back for a refund, but since it takes 8 weeks or more to get a new set from AFR, I thought I would see if anyone would like to avoid that and pick these up now. If they don't sell by Monday, or Tuesday, I will likely send them back.

 

Im a LSX noob so ill ask a dumb question..

Will these work on a LS1?? With intake,headers,exhaust and a cam??

Thanks
Josh

 

Here is AFR's page on these heads. I don't think I could explain it any better than they did. Here you can also see that the 1660s that I ordered show to have 72cc chambers, which as I now know is not the case.

http://airflowresearch.com/225_mongoose.php

 

Not to knock his sale of the 225's but I think you would be better off with an AFR 205 head....these 225's are perfect for say a 402 or 408....bigger cubed motor.

J

 

I agree; 205s for stock cubes. The 225s will work on pretty much anything else; 382ci stroker, and up.

 

New replacement heads shipped Wednesday (8/2). When they arrive I will be taking them and the AFRs back to the machinist to have the new ones flowed, cc'd, etc., and the AFRs will be sent back to AFR. So these will likely be available at least through this weekend. Please let me know if you are interested.

Thanks

 

New heads have arrived. I will be taking them and the AFRs to the machinist Monday afternoon.

The AFRs are some of the best heads available. These are brand new and have had their flow numbers, chamber sizes, and spring heights and pressures checked and confirmed. With these, you know exactly what you are getting and what you can expect out of them. Get them now and avoid the 8+ week wait for another set from AFR.

 

Not sure if you sent these back yet or not but was wondering why they won't work with your setup? You have a 382 with the D1SC, is it because the 382 or the D1SC? I'm looking for a set of AFR's that will work with my stock bottom end 346 and a D1SC. If these are what I need I might have to take them. If you already sent them back that's cool but could you still let me know why you chose not to use them?
Thanks,
Lou

 

The reason they won't work for me is because the chambers are too small. My current heads have 73cc chambers which gives me a static compression ratio of 9.88:1. I want my static CR to be between 9.5:1 and 9.9:1, so I need to stay right around that chamber size; give, or take a cc, or two. These were supposed to have 72cc chambers, but they are 65cc. The new heads, which arrived Saturday, have 74cc chambers.

These could work for a forced induction stock bottom end as long as you don't have it pullied to make too much boost. With the smaller chambers, you would create more cylinder pressure and heat. You would also lose a little torque on the bottom end due to the larger intake runners. You should use an online compression calculator to make sure your static compression ratio would not be too high. Since these chambers are smaller than stock heads, you could get into detonation issues on pump gas. This could be aleviated by using methanol injection, higher octane fuel, less timing, richer air/fuel mixture, etc.

My 382ci, 73cc chamber is making about 12psi with the D1SC pullied to max the impeller at 6300 rpms, with about 17 degrees of timing. With smaller cubes and smaller chambers, you could not run the s/c as fast, you would have to pull more timing, fatten up the mixture, and get a good conservative dyno tune. Even then detonation might still be an issue.

 

Thanks for the help. I new the 225s would lose a little low end torque but I'm not too worried about that because of my stall. I am however worried about my compression. I can't believe afr doesn't make them with the 72ccs. I'm pushing my luck with the stock bottom end as it is so I need to make sure I get a set of heads that will give me a safe compression. Well good luck with the sale or getting your money back from afr.
Thanks again,
Lou