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Old 09-10-2002, 03:27 PM
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Post WANT MO' TORQ BELOW 1500RPM

350 CHEV. ELGIN 204 INT/214 EXH DURATION AT .050; CAM LIFT .280 IN .295 OUT = .420 & .443 WITH 1.5 RATIO ROCKERS BUT I HAVE 1.6 ROLLERS SO I HAVE MORE LIFT .448 & .472, BUT THAT'S NOT SUPPOSED TO AFFECT THE TORQUE CURVE RIGHT? LOOKING IN SUMMIT AT A CRANE CAM ALMOST DEAD NUTS (204/216, .427/.454 LIFT) CALLS FOR OPERATING RPMS TO BE 1500-4500. SO FAR SO GOOD. MY 5000+ POUND TRUCK RUNS LIKE A RAPED APE IN THAT RANGE BUT IS A LUGGIN MUTHA BELOW THAT. I HAVE 1.94 STOCK IRON HEADS I PORT MATCHED TO A TORQER INTAKE BUT I HAVE A STOCK RPM ON IT. YEAH, I KNOW, BUT THE RPM ISN'T SPOZED TO GIVE UP MUCH IF ANYTHING TO THE PERFORMER DOWN LOW AND I HAD THE PERFORMER ON BEFORE AND DIDN'T SEE ANY BENEFIT. WHEN MY 350 GOT YANKED OUT AND REPLACED WITH A 327 W/305 HEADS-SMALL VALVES, IT SEEMED TO ME IT GOT UP AND WENT QUICKER. QUESTIONS: 1-SHOULD I HAVE JUST STUCK A STOCK CAM IN? ( I MEAN, HOW MUCH CLOSER TO STOCK COULD I GET ANYWAY?) 2-SHOULD I GO BACK TO 1.5 TO 1 ROCKERS? 3-SHOULD I STICK SOME 305 HEADS ON MY 350? 4-MAYBE I SHOULD JUST PORT MATCH MY RPM INTAKE? OR MAYBE I SHOULD JUST LEAVE EVERYTHING ALONE AND CHANGE MY CRAPPY 3.50:1 REAR GEARS. I NEVER HAD ANY PROBS WITH MY FULL SIZE BRONCO WITH THE SAME GEARS AND AN AUTOMATIC. THIS WOULD EXPENSIVE SINCE IT'S A 4X4. AND I WILL BE DOING IT ANYWAY WHEN I GET (RICH) POSI-GEARS. I AM RUNNING A MUNCIE TRUCK 4 SPEED W/GRANNY LOW (SM465)I'M OPEN TO ANY SUGGESTIONS.

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Old 09-10-2002, 04:25 PM
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Try some Rhodes or Crane variable lif lifters. They claim to 'detune' the cam at low speed by limiting lift, while giving full lift at speed. I have a set in the Chevy 6 with a 260 cam in my sons '36 Pontiac and he has tons of low end torque.
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Old 09-10-2002, 08:59 PM
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WITH 1.5 RATIO ROCKERS BUT I HAVE 1.6 ROLLERS SO I HAVE MORE LIFT.

Don't yell so much. Please explain to me what 1.6 rollers are. You are talking about roller lifters right?, Since you already have 1.5 rockers. Thanks

[ September 10, 2002: Message edited by: Quepas00 ]</p>
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Old 09-11-2002, 04:59 AM
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Try advancing the cam about 3 or 4 degrees. This will move the power band down a few hundred rpm's.
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Old 09-11-2002, 06:18 AM
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So it`s true typing in CAPS is considered yelling on the forum? " I missed what size headers you run.
Slider in Wa.Bull"
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Old 09-11-2002, 01:56 PM
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so i gotta bigga mouth. actually i type in whatever my keyboard happens to be in. and with my crappy vision i like to see all caps. anyway, my cam is already advanced 2 degrees. the machine shop agrees i could advance it 2 more and see what happens, as i have gears, i can do that "easily"--hahahahaha! oh wait, HAHAHAHAHA! apparently i threw away some little red dealie that came with my uni-lite from mallory that lets me adjust the timing, he wants me to add some, and says i should try a higher grade of gas too instead of 87 octane. he didn't like the rhodes lifter idea cause my cam wasn't big enough to do much good and he thinks they beat up the valve train. i already got some kind of "high loop slot" lifters anyway i paid more for so would rather not replace. looks like i gotta pay more for gas; find a uni-lite doo-dad; and dig up my advance eccentrics for my gears. SO WOULD PORT MATCHING MY RPM DO ANY GOOD OR NOT? the heads are already gasket size and the intake aint. also i have 2" rams' horns into 2&1/4" pipe for two feet, then into 2&1/2" all the way out the back thru flowmasters,no crossover. the 1.6's are roller tipped rockers AAAHHHHHHH!!! <img src="graemlins/spank.gif" border="0" alt="[spank]" />
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Old 09-12-2002, 10:15 AM
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I believe port matching would hurt low end. Sure the overall HP would go up. But the added runner volume would reduce the velocity. The whole reason the 305 heads felt so strong was that the runners, valves, and chamber are smaller.
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Old 09-12-2002, 11:34 AM
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Why not have 2-1/2 all the way back?
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Old 09-12-2002, 02:14 PM
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Its always a good idea to match to the the gaskets. Just blend-in about a 1/2" on either side of the gasket and don't do anything to the ports if you want to keep the velocity up.

[ September 12, 2002: Message edited by: Quepas00 ]</p>
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Old 09-12-2002, 03:58 PM
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WELL, er, well, i forgot to mention i port matched the rams horns to the head. bfd! the muffler shop guy said 2&1/4 out the collecter would make better torque for 2 feet or so, so hey, what do i know, did it. another guy here at work thinks the main problem is my crappy truck tranny with granny low so im using 2nd as first and then 3rd is like out there in left field so i'm lugging. he also said to try higher octane. well, with a 29 gal. tank i have to wait till payday-tomorrow, plus then i'll probably need gas. im iso a car tranny to put in. maybe that'll help-COULDN'T HOIT! but first i'll try 89 octane. then primo before i screw with my cam timing. i would think a regular performer would do better than the rpm, but i gave it away 2 weeks ago and i didn't feel any difference when i tried it before when my truck had 4.11 gears instead of the 3.50's. ps my rpm has not been matched to the head so the head port is bigger. i'm rambling.

KNOW I DONT HAVE ANY LEAKS, I'VE BEEN THINKIN MAYBE I'LL READJUST MY VALVES WHEN I RE-TORQUE MY HEAD BOLTS. BUT STILL, I MEAN THIS SUCKER JUST HAULS BAULS WHEN I STICK IT AT OVER 1800 RPM SO I'M REALLY NOT SURE ABOUT TIGHT VALVES. I'LL HAVE TO DOUBLE NUT THE NUTS IF I MESS WITH THEM ANYMORE
BETTER GAS HAS HELPED BUT I THINK REALLY THE RATIO BETWEEN 2ND AND 3RD GEAR IS WAY TO FAR APART. THESE TRANNIES ARE VERY POP. AMOUNG 4X4 CROWD FOR THE 6 AND CHANGE TO ONE FIRST GEAR FOR ROCK CRAWLING, BUT IT MAKES MY TRUCK MORE LIKE AN ARMY TANK, TAKES AT LEAST 3 SECONDS TO SHIFT FROM 2ND TO 3RD.

[ September 13, 2002: Message edited by: bullheimer ]</p>
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Old 09-13-2002, 04:56 AM
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That cam shouldn't hurt low end, it's pretty mild. Might look elsewhere, Ignition,carb or intake leaks, could also be to tight valve adjustment. The Rhoads lifters seem to be unneccesary for your set up plus the ticking at low speed will drive you crazy.
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Old 09-13-2002, 05:38 PM
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I'm big on theory, but you hit the nail on the head with your small engine that ran better than your 350.Less is better when it comes to low speed power. It's probably not a very popular idea, but very few intakes outperform the stock GM under 1500 RPM. Also, the rhoads lifters should be a quick and effective fix. The stock 929 cam will make good torque below 1500.
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Old 09-16-2002, 01:19 PM
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i just want everybody to know that just using higher octane gas virtually eliminated all my lugging woes. yes the factory parts are MADE and DESIGNED for bottom end off idle torque-the end. probably should have used all stock parts but you know how it is... if i was gonna do that i woulda never even tried to find this web site. plus a stock engine is just plain boring. i didn't think better gas would help because above 1800 when i mashed the gas it was like "HOLD ON, I THINK THE HOODS FLYING OFF! OH CRAP THE HOOD DID FLY OFF, NOW THE FENDERS ARE STARTING TO GLOW!! HOLY CRAP WE'RE HITTING WARP SPEEEDD!!! OH NO! HANG ON ITS, I THINK, YES, ITS TIME TO SHIFT INTO THIRD GEAR!!! so i really wasn't expecting the big improvement but I got it where i want it now, thanks agin! (ps, i don't notice any increase in my performance over 1800 rpm!weird eh?)
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