Hey all,

I have decided to get AFR 190's for my 406...but I need some cam recommendations. I am thinking about a Comp (hyd flat-tappet)extreme energy 270H-12 (.480/.489 lift)(226/236 duration)with a 112 lobe sep. I am wondering if this is too much duration on the exhaust side? I am using a DFI so some edge can be taken off a lumpy cam at idle. I also have a Super-ram base with SLP siamesed runners and a 58mm TB. What do you think?

Thanks,
James

BTW, the car has a 700R4 with a 2800 stall convertor and 3.23 gears.

 

I would recommend the Lingenfelter # 74219 hydraulic roller for your 406.
It is 219/219 @.050
.503/.525 lift and 112 LSA
designed by "the man" to work with your application... a 406 w/AFRs & DFI

I use the smaller size on my 383 and have great results.

just my .02
good luck,



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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, .462/.470 lift @1.5:1 ratio. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch.
N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99

 

The LPE Cam would be a little too mild for a afr headed 406. I would go with either the LT4 Hot Cam or the more radical of the 2 SLP cams from Summit!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

406TPI.....I would also check out Crower Cams (www.crower.com) I would suggest a mid 500 lift with an .050 of around 228 or 230 on the intake, and 236-238 on the exhaust. Try to keep LSA around 112 or 114. That cam would scream with your setup.

 

BTW....I'd go with the 195s instead of the 190s if possible.

 

The only real difference between the AFR 190 and AFR 195's is that the AFR 195's is port matched to the larger FelPro 1205 intake gasket(1.280" x 2.090") rather than the smaller 1.230" x 1.990" Felpro 1256 intake gasket that the AFR 190's sue. The intake and exhaust flow is virutally identical across all valve lifts.

The problem with using it with a SUperRam manifold is that the wall thickness at the bottom of the intake ports, as well as inbetween the adjacent ports, is pretty thin. If their is almsot any core shift in the manifold, it is difficult to get a leakfree manifold to head gasket.

I have used a couple of SuperRam's, most recently on a 500hp 383 that I ran for 2 years prior to building my SBC 434. I have seen some guys having to do a little welding to build up enough material to allow port matching to the larger gasket.

I also converted a SuperRam for use with AFR's 215 Raised Runner heads. Those heads made a heckuva lot of power, almost 560hp, but alot of welding and reporting had to be done to get the ports matched.

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SBC 434 700hp/600tq
434 Specifications

 

Thanks guys for the suggestions! I should have specified that I will be using a hyd. flat tappet cam, not a roller......at least not yet

Just ordered my heads, just shy of $1400 for 190's with temp sender drilled as well as steam holes.

I asked about the 195's and Monty is correct. They have the same flow numbers.

 

406,

I think the ODB is on track here. The AFR 190's you have will produce 80% exhaust/intake flow. That is optimal for a N/A street car.

So, you do not need additional exhaust flow. In fact, presuming you have headers with good exhaust, a split-pattern cam will slow you down.

Cunnilingenfelter's 219/219 cam is a tad mild, IMHO. I think it's worth investigating, say, an combination of an Extreme Energy cam from Comp combined with a 1.6 rocker on the intake side only.

This makes a split-pattern cam act more like a "straight up" cut, since the 1.6 rockers on the intake outflow the 1.5's on the exhaust.

I'll be putting 1.6's on my intakes this spring, and can report back. But for right now, ANYBODY currently running a split-pattern cam with 80% E/I ratio heads and 1.6 rockers on the intake side ??

Let us know what you think. Thanks.

BOR

 

BOR,

That's an interesting point I hadn't even considered yet. I have looked at a few engine build-up's with AFR heads and it seems that the cam is always very close on the duration (ie, within 2-6 degrees) and the lifts are kept on the smaller side. Make me want to try something along the lines of 226 duration with about a .500 lift and a 112-114 lobe sep.

What do you think?