88BlueGT

here is some more info about the MM&FF test to fuel this wonderful argument about heads.
the test engine was a CHP 306 ci engine with a Comp Cams XE264HR cam that had .512" lift on both intake and exhaust valves with a split duration of 212/218 @ .050" lift with 114 degree lobe centers. they tested all the heads at different total timing levels and they all made the best HP and torque with 34 degrees of total timing.
the Probe pistons with dual valve reliefs for future testing of bigger valves yielded a compression ratio of 9.1:1 with the stock E7TE heads with their 61.5 cc chambers.
the GT-40P heads had 60 cc chambers and CR of 9.20:1
the World heads had 57 cc chambers and CR of 9.60:1
the GT-40 turbo swirl heads had 62 cc chambers and CR of 9.05:1
the Canfield heads had 62 cc chambers and CR of 9.05:1
the Brodix heads had 59 cc chambers and CR of 9.36:1
the Holley heads had 64 cc chambers and CR of 8.75:1
the Edelbrock heads had 59 cc chambers and CR of 9.36:1
the AFR 165 heads had 56 cc chambers and CR of 9.65:1
In the final analysis, the AFR 165 heads made the most HP and torque overall compared to the stock heads, an increase of 90 HP over stock and 36 ft-lb torque over stock.
the GT-40P heads made only 30 HP and 17 ft-lb torque over the stock heads.
they also supplied a price per HP figures based on street prices for the heads and at $1299, the AFR's were $14.43/HP versus $18/HP for the GT40-P; $17.53 for the World Windsor Jr.; $21.25 for the GT40 Turbo Swirl; $18.45 for the Canfield 170; $18.10 for the Brodix ST 5.0R; $15.90 for the Holley SysteMax; $12.81 for the Edelbrock Performer.
Looks like to me the AFR's definitely gave the most band for the buck versus all but the Edelbrock heads but they made 21 more HP and 9 ft-lb more torque over the Edelbrock heads in addition to making the most average HP and torque too.

88BlueGT

I think I would feel 20hp & 10 ft/lbs

dman302

Not really from my tune I picked up 25 hp and 30 in torque and barely noticed a difference on the street...with the money you save on the TW you could have Ed Curtis design a cam for you that when combined with your parts would be an absolute joy. Money I save on my heads over the AFR purchase allowed me to pic up my cam basically free.

ih8chevy

thats an interesting chart but yeat he afr's are the best heads out there and they are proven time and again, just save a little more for em and u will be real happy u did. also
from that chart what did hte canfield heads run?

88BlueGT

Not sure..... Im pretty sure that Canfields were right up there with the power gains, etc. but the 170's are very expensive.... I think they around $1,600 or $1,700. Their bigger heads are cheaper than AFR's though I believe.

1BIGMOFO

Ok OK , I think the afr's are sold. Im going to tget the 185's with the upgraded spring package for $1535.00 shipped to my door from e-bay does that sound cool? Im building a 347 and I dont know what to run for compression and what size injectors to get. Im trying to plan the full build now and its getting very frustrating. I dont wanto just start ordering things with out setting it all up! Any help is appreciated. Thanks Bob