alloy heads - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

XRQTOR · 08-28-2003, 21:39

The Ultimate Bolt-On Emission Legal Street/Strip Weapon
If you need the world�s finest street/strip small block Ford head, check out AFR�s all new 185cc intake port emissions legal (CARB EO #250-3) cylinder heads. With 2.020 intake valves, 1.600� exhaust valves, combustion chamber volumes of 58cc or 61cc, and 69cc exhaust ports, AFR�s new 185cc Ford head is designed for 302-351 cid engines operating from 1500 rpm to 6500 rpm. A 3/4� thick head deck makes the AFR head ideal for nitrous or blower applications. Will not accept rail rocker arms. Hardened pushrods required with heads #1420 and #1422. High flow 2.020 valves might require aftermarket pistons notched for valve clearance. Note: 1986 5.0L must have pistons notched for clearance. (posted by ho302)
just wondering
when it says operating from 1500-6000rpm will these still work under 1500 or not if not isnt 1500rpm a bit high for idol on a street car and will these simpliy bolt onto a ef xr8 without any mods and if it does will my cast engine cover still fit

347 · 08-29-2003, 00:13

yes they will work under 1500rpm
1500-6500rpm means that its the period of which they will produce the most power
awsome heads but not for stock/street 5.0,you would be wasting your money,you need more cam, for those heads
My heads work in that range,if you would like to see how they work come and see me at wakefield and i will take you for a drive !

ebxr8240 · 08-29-2003, 02:47

Plus heaps better inlet,throttle body and maf..and fly cut std pistons atleast for p/v clearance..
To get full advantage..Other wise the smaller 165 head..

XRQTOR · 08-30-2003, 06:30

yea i got plans to do all that and storke it, but ill get the info first

cobra8 · 08-30-2003, 06:55

The AFR 185 have a upgrade valve option for a little extra $
Longer stem and higher rate spring machining for larger diameter spring
all for extra US$120
My heads with standard valves will not be suitable for the cam (.565) I have selected Too late now
I think I will have to pay a lot more to have new valve train fitted or buy a new cam

ebxr8240 · 08-30-2003, 07:36

I guess these are stud mount rockers ???
Seeing it says hardened pushrods required...