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These Flow numbers were gathered at Flow Technologies, with Manley severe duty valves. Was Brownfield bought by AFR? What do you folks think about these heads? All info is appreciated. Thank you.
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'83 Trans Am: 400 CID oil burning junkyard long block, 224/234 crane cam, Summit aluminum roller rockers, hand ported intake, home bored 2.09" (53mm) throttle bodies, MSD 454 injectors(75 lb/hr), Holley 255LPH fuel pump, custum modded FPR, Edelbrock TES headers, SLP 3" stainless steel cat back, stock ECM & chip. Borg/Warner T-5 World Class, 12" Corvette rotors and clipers, GTA 16" wheels, South Side Machine subframe connectors, 1LE sway bars, 3.45 ring and pinion, Alpine sound.
Best E.T. 13.532
Best MPH 102.24
I found out more about these heads;
The combustion chamber size is 66cc. They started out at 64cc.
The intake runner size is 208cc.
The heads are angle plug style.
The intake valve size is 2.02 and .100 longer than stock, and the valves are Manley Severe Duty.
The exhaust valve size is 1.625 and .100 longer than stock, and the valves are Manley Severe Duty 30 degree tulip style.
The springs are currently set at 225 lbs seat pressure and 600+ at .600 lift.
The heads do have bronze guides with pc seals.
The heads are definitely set up for a solid roller camshaft.
The valve guides have only been cut for .600 lift, if you want to go higher, you'll need to cut them.
The valve springs will work to .700 lift if you cut the guides. I was leaving them long for the cam that I was going to use.
The heads have been pressure tested. I do that to all my new cylinder heads and they passed just fine.
The intake ports have been matched to a Felpro #1206 intake gasket.
The exhaust has both bolt patterns stock Chevrolet and spread port bolt pattern. But the heads have standard exhaust port location.
How would these perform on a SB 400 w/ 224/230 dur - .518/.536 lift roller cam? Are the ports too big? How would this head compare to the AFR 195? In other words, if I could get this head for $1000.00, would it be worth it? Or would I be better off to spend ~ $1400.00 for a set of AFR 195's?
[This message has been edited by Tom 400 CFI (edited June 22, 2001).]
You have to factor in a couple of things. You will need valve springs. The existing spring is probably 1.55 inch. You will probably need something like a 1.45. You might be able to take the inner spring out and get the seat pressure right for the hyd cam.
The other thing is the chamber size. I ended up with approximately 10.8 to 1 with a 69cc chamber and flat-top with 7cc valve relief. (zero deck and 9.2cc gasket). With a 66, your probably be over 11 to 1.
With a cam that has that short of a duration, cylinder pressure will be real high at low speeds putting it on the verge of detonation (certainly with pump gas). Once you add the issue of valve spring setup, with the possibility of the compression being less than ideal, it might be more cost effective to get the AFRs.
Plus, are they going to need a valve job?
Quote:
<font face="Verdana, Arial" size="2">Are they to big?</font>
No, I have a set of Track1s and in a 400, low end is good. I would not use a real wide lobe separation angle if you can. 110 or less will really make sure the midrange and lowend are really snappy. Use something like a 3.73 gear.
[This message has been edited by jcb999 (edited June 22, 2001).]
The heads you are looking at are angle plug style and you will have spark plug clearance problems if you have SLP headers like me. (only reason for selling them.) If you need them set up for a hyd roller I can do that for you.
P.S. I just got a new set of aluminum 220cc Pro-action heads and the brownfields out flowed them on the same flow bench
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92 Z28 5.7 TPI AUTO 105k factory motor and trans.
SLP headers and runners, B&M 2400 stall, shift kit,LCA brackets, EIBACH spring kit, NITTO'S, N.O.S.
Guy's, Thanks for the GOOD posts. After reading your posts and thinking about it, I decided I'll pass on these and go ahead witht the heads I had planned on getting - the AFR 195's. Thank you very much for your input.
