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Old 07-20-2010, 09:59 PM
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which AFR heads for 400ci in a 184 bowite block

Hi folks, i need some help determining which size AFR heads to mount on my new combo..cant decide on either the afr195s or the 210s,"either one will be the full comp version fully cnc'd with 2.08 intakes,..and the chambers/valves/runners Will be coated with TC2 before install.

my build so far consisits of a new bowtie 184 block with 4.125 bores,9.005 deck height, fully machined with aftermarket 4 bolt splayed billet caps and is 1piece rear main, and has piston squirters installed

rotating assembly is an eagle 4340 crank with 3.75 stroke,..6 inch eagle Hbeams with L19s,..-16cc D dish JE pistons "pistons have fully coated crowns,skirts,bottoms...10.2-1 static compression ratio,crank and rods have the eagle ESP armor finish and assembly is internally ballanced with TCI Rattler damper and TCI neutral balanced flexplate

intake is edelbrock rpm airgap,cab will be a holley built by AED once the rest is sorted out,ignition system is all new MSD with an 6al.

the engine is going into a 94' chevy 1/2 ton stepside truck that has a strange 12 bolt rear with 3.55 rears,tranny is a gearstar 700r4 rated for 700hp,no converter decision yet "waiting till cam choice is made"

the truck is intended for hot street,no smog equip required here,it will be driven very regularly,...and the cam will be a retrofit hydraulic roller,im just not sure if the AFR 210s will be to big for the engine,i dont want it to be a dog on the street,and it will see a small amount of NO2 "150 shot occasionally at the strip..any help with a cylinder head choice/possible cam would really help out. thanks

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Last edited by JRINE; 07-20-2010 at 10:52 PM.
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Old 07-20-2010, 11:48 PM
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I would say the 195's with only a 3.55 gear, if you were willing to step to 4.11-4.30 area and more RPM then the 210's could shine. 195's if your not intending to go over 63-6400ish rpm.

A street specific grind solid roller would really be what I would do with that strong a bottom end naturally aspirated, and rev it to 7000+.

Build almost sounds like you are considering adding boost down the road?

Need a better idea of where you are willing to go rpm-wise, and if you are contemplating racing it some at a track.
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Old 07-20-2010, 11:54 PM
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Played around with it on the DynoSim using 195 Comp heads and this cam, retarded 2 degrees. (timing figures 2/42/54/2, ICA 110, ECA 116, LSA 113).
http://www.compcams.com/Cam_Specs/Ca...?csid=171&sb=0
RPM HP TQ
2000 166 435
2500 210 440
3000 268 469
3500 334 502
4000 395 519
4500 450 525
5000 491 515
5500 512 489
6000 509 446
6500 462 373
Peak volumetric efficiency 99.6% @5000
Peak BMEP 197.6 @4500
Will make some serious cylinder pressure. Use good fuel and tight squish. 210 heads will make 6hp over the smaller heads according to my software with the same torque from 2000. Slightly more hp can be made with more cam, but then the bottom end torque suffers. I'm a big fan of low end torque.
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Old 07-21-2010, 12:35 AM
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[QUOTE=JRINE]Hi folks, i need some help determining which size AFR heads to mount on my new combo..cant decide on either the afr195s or the 210s,"either one will be the full comp version fully cnc'd with 2.08 intakes,..and the chambers/valves/runners Will be coated with TC2 before install.

my build so far consisits of a new bowtie 184 block with 4.125 bores,9.005 deck height, fully machined with aftermarket 4 bolt splayed billet caps and is 1piece rear main, and has piston squirters installed

rotating assembly is an eagle 4340 crank with 3.75 stroke,..6 inch eagle Hbeams with L19s,..-16cc D dish JE pistons "pistons have fully coated crowns,skirts,bottoms...10.2-1 static compression ratio,crank and rods have the eagle ESP armor finish and assembly is internally ballanced with TCI Rattler damper and TCI neutral balanced flexplate


My base rotating asmbly. is pretty much identical to what you have. I am running the AFR 210s with a full mechanical roller. 248 -254 duration @.050. with about .58 lift. The combo works well in my 2000lb car with a 4.10 gear, full manual reverse pattern th400 with 4000 stall. Street driven; however, its by no means a daily driver.
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Old 07-21-2010, 12:41 AM
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New plan. Same 195 heads, but with a custom grind solid roller cut on 113 degree LSA for the N2O.
Lift 0.630"/0.630"
Timing figures 18/54/67/11
Duration @ 0.050" 252/258
ICA 108, ECA 118, LSA 113.
Installed 3 degrees retarded.
RPM HP TQ
2000 149 391
2500 190 400
3000 241 421
3500 311 467
4000 387 508
4500 459 535
5000 521 547
5500 559 533
6000 586 513
6500 588 475
7000 563 423
Peak volumetric efficiency 104.9% @5000
Peak BMEP 205.8 @5000
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Old 07-21-2010, 02:44 AM
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thanks guys,but since the chevy truck that this is going in weighs in at over 4000 pounds,bottom end torque will be a must to have any sort of acceleration,im just trying to make 475-500 horses on the motor alone if possible and still have a fun to drive truck,and then spray it a little with a 125-150 shot occasionally at the track in baytown...will of course have to drive well on the interstate...also,the truck will run soley on shell 93 octane,...the main reason that i had the pistons custom coated,..and will have every surface in the cylinder heads thermal coated was to manage the heat,help the velocity,and of course quell detonation...and also..would a solid roller setup be reliable in my setup,...the reliabilty concerns are mostly what push me in favor of the hydraulic roller setup which is why i went ahead and cot a rev kit

thanks mr techinspector for checking out the combo,as i said before all help here is greatly appreciated

oh and one last thing....a 406 in a bug?lol thats beyond evil,that has gotta be scary fast

Last edited by JRINE; 07-21-2010 at 03:22 AM.
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