400 5.7 rods. SRP flattops. 10.8 to 1 compression. Brodix Track1s. Current intake performer rpm. Demon carb.
3180 lb camaro with 4.10 gears and 5speed
Cam motion
.050" duration 240-intake .596"
.050" duration 247-exhaust .604"
110 lsa
106 intake centerline.
$290.


comp cams $258

intake
.608" 236 @ .050
exhaust
3120 lobe
.613" 244 @ .050

or this exhaust (I think it would keep velocity up a little)
3150 lobe
.576" 244 @ .050.

I am inclined to go with an LSA of something about 108 or 109. And a 104 intake Centerline. (certainly on the comp)

 

i think i like the first one better. my 406 is not quite as bad as yours and my cam has 240/246 @ .050. of course, mine is a hydraulic flat tappet and the lift is only .507/.510. both of those cams had huge amounts of lift imo. i think they might both be too big, especially with a dual plane intake. your compression is pretty high, too, hope you can get some race gas to mix with the premium. at least you have the gears and a 5 speed.

------------------
88 S10
Dropped 5/5
18" Boyd Coddington Timeless 5s
406 balanced with 6" Eagle H-beam rods, 10.25:1 JE SRP pistons, Comp 284XE cam; 240/246 @.050, .507/.510, Dart 200cc Ironeagle heads, Victor Jr. intake, Holley 750 vac sec.
12.20 @ 115.25 mph

 

just a point of reference.

Before, I had the motor together with the same parts (except shortblock) using a custom comp hydroller.


It used the magnum 280 lobe on the intake and a XE284 lobe on the exhaust.

The specs were
.605" with 230 at 050"
.555" with 236 at 050"
The cam was ground on a 109 lsa and installed at about 106.

I found that it would go from 3000 to 6000 in about the length of time it took to push the pedal down for gears 1st through 3rd. It seemed to be running out of power band. I planned on stepping up duration (with about the same lift) and maybe tighting the LSA just a bit more.

Ps, I have to change to get a reduced base circle. Can't afford it otherwise just for a few degrees of more duration.


[This message has been edited by jcb999 (edited June 14, 2001).]

 

I like the 1st cam motion, but I would go with a victor jr. and a 1" spacer this will give you the wide power band you want - some rpm. The rpm intake is too small for your combo, the victor jr. will make more power above 4500 and will not run out of juice at high rpm. These 2 changers would really help.

------------------
91 B4C 305 TPI - SOON TO BE 383
TREMEC 5-SP, STOCK 1-BOLT REAREAND w/342 GEARS, K&N, AIRFOIL
EDELBROCK HEADERS, DUAL CAT TO HOMEMADE Y-PIPE & 3.5" SINGLE PIPE W/ FLOWMASTER, CRANK PULLEY, MSD, FUEL PRESS REG, COWL HOOD, WELD WHEELS
14.1@ 98MPH
-------------
OTHER RIDE
67 CAMARO - STREET CAR, BIG BLOCK, PUMP GAS
350TH w/ATI 10", 12-BOLT w/373 GEARS
10.94@124.13 ON MOTOR - ET-STREETs w/MUFFLERS

 

I was really debating Vic Jr. The only reason i think it could go either way was the info provided in "how to 11sec GM fbodies". He said that he lost .08 to .12 second in a quarter going from performer rpm to vic jr. He also said it was all 60 foot time. This was on a 11.1 sec 400. It was an auto trans however.

According to Ebrock, the runner sizes of the Vic Jr and perf rpm are the same.

I would really prefer a Holley Strip dominator or Brodix HV1000. I think they have slightly longer runners and more volume under the carb.

I do really like the sleeper factor of the dual plane though..even if i give up a little hp.

[This message has been edited by jcb999 (edited June 14, 2001).]

 

Just curious,, what was the basic engine combo and cam used in the "how to" 11.1 second engine? I saw that car run many years ago,, he uncapped the exhaust on the thing and it ran 11.40's,,, I think. Still pretty impressive,, depending on the head flow.

 

the car was an 83 TA (updated with 90 trim).
The stage 1 and 2 heads were cast iron bow-ties

Stage 3 and 4 were afr 210s. He did open the chambers to the bore diameter but installed them with out of the box ports.

The cams were a crane 110551 (lame as* 230 duration at 050 with like .490 lift for stage 1 and 2
Stage 3 was a crane 110691
238 .502
244 .516

Stage 4 was a lunati solid #40146
249 .543
254 .552
The only change from stage 3 to 4 was the lunati. All except stage 1 uses 1.6 rockers.
He used a 3.70 gear and 2800 rpm converter. The motor was not twisted past 6200.

As far as I am concerned, he had almost the perfect combination. It was fast but was not hard on parts. Even if you buzzed it higher, it would not go much faster and could significantly increase the initial investment. My first attempt at replicating some of his results was not successful. Going to make some improvements for my second.

PS, crane has some good looking hyd rollers.
http://www.cranecams.com/lobemaster/hydraulicroll.htm

[This message has been edited by jcb999 (edited June 14, 2001).]