Currently I run a 350 with vortec heads and a mild hydraulic camshaft in my 1982 Camaro, and it runs 12.4's on street tires.

I want my next motor to be quite radical on somewhat a budget. I would like to buy cylinder heads soon. I was looking at the pro action cast iron raised runner 222cc 23* cylinder heads. Out of the box, unported they flow 296 @ .600 and 212 @ .600 on exhaust. Pro Topline's ported versions flow 338 @ .600 and 241 @ .600 on exhaust.

I have a guy who does great port work who will do the rest of the porting these heads will need, and I would like to see about 315 cfm on intake and 225 cfm on exhaust when he is done.

What do you guys think about these heads? Any opinions? They will be going on a 383 with a fairly large solid roller cam in it. What kind of numbers do you guys think this motor could be capable of with 11.5:1 compression and good intake/exhaust components.

Thanks,

Seth

 

me and some of my freinds have used the pro action heads (the smaller ones) and they are absolutely awesome. On one motor we ditched the Sportsman 2s and dropped on the PA 200s and the sucker picked up 2 tenths in the 1/4!! We flowed them against my 190 AFRs (for an LT1 ) and they blew my smaller AFRs away My afrs maxed out a 254/203cfm @ 550 lift and the 200 cc PAs put out 272/201 at the same lift. The exh on the PAs wer untouched and the AFRs have the base CNCing that comes from them.
I am about to yank of my AFRs on my T/A and have them ported, I should have done it before I put it together.
Basicly I like the PA and the next conventional SBC I build will have em.

 

While peak flow numbers by no means tell all, I'm kinda suprised to see your afr's had similar numbers as my mildly ported "stage 1" heads. At .550" lift, mine flowed 255 / 193 (no pipe) compared to your 254/203 (probably no pipe ext. as well). I was thinking about going with afr's for my solid roller 383 but maybe I'm better or with getting a really good set of ported stock castings. Any ideas?

 

This is a little confusing. I know there are variations due to differences in testing procedures and manufacturing variations. But my untouched "street" port AFR LT4 195's maxed at 264/202?. Maybe I got lucky, but I don't see how a set of CNC ported LT1 190cc AFR's didn't flow better than my unported set?

Anyway, I have also heard good things about Pro Action heads. However, I am not a fan of iron heads unless there is simply no room in the budget for aluminum or you are racing in a class that requires iron heads. As I am sure you all know, aluminum allows you to run higher compression and more timing. Aluminum heads are significantly lighter, easier to port, and much easier to repair if you screw up the porting.

Rich Krause

 

They werent enlarged persay with a special CNC job it was just the base job that comes with a set of heads from AFR when you get em.
RK what lift did they goto on the 264 cfm? My 254 was @.550 lift , the bench used 28 inches of water.
Dont get me wrong I like my AFRs they ran well on the 350 But I think they need to flow alittle more now that I'm swelled to 383 ci.

I recently took the car to the track and a few things I can correct to get some more MPH but I thought it was slightly low, the best mph it ran that day was an 108.89. The DA was @around 2200 feet (ill have to look back at my buds weather station slip , I had it here earlier) But anyway it was very very humid and around 67 degs. It had just rained earlier in the day and I couldnt stick for crap after the initial launch. Of course I think I have other issues as well, for instance I would like to go bigger cam wise, went with a 224/230 XE cam and with I had went about 2 steps bigger.

 

Pro Action wants a ridiculous amount more for the aluminum versions of these heads.

 

Then they are essentailly identical. Mine flowed 257/191 at 0.550" lift.

Rich Krause