Need help from sbc guys
Need help from sbc guys I have a 1977 gmc sierra truck and with a stock 350 with a mild cam 8.5 comp and headers through a th350 trans with a 3500 neal chance stall ran a 14.37 @91 mph. The truck weighs 4100 with me in it. I need to see what you guys think about my new setup. I am putting a extreme energy cam in . It is a hydraulic roller specs are @ 50 230-236 duration and 520-540 lift, 110 lobe speration, Cnc 'd trick flow 195cc heads uping the comp ratio to 10.1. victor jr intake, headers no mufflers, same trans and stall and a 670 carb. Do you think that setup would run close to a 12.9 @ 100 mph. Let me know what to change on my setup. I already have the cam but still looking for heads but leaning towards the trick flows. So let me know, Thanks, Jared
The heads are fine, i would sugges a bit bigger cam for those heads, the 236/242 XE comp cam would really be happy with them, will runn well though, i dont see why 13.00~ are not possible.
the cam you already selected would do nicely with a compliment of nitrous. As is though, i dont know if it'll run 12's but it will be low 13's for sure. Thats alot of weight to get down the track.
your main problem of going fast is going to be aerodynamics. it will be harder to move a square box(truck) as fast as a wedge(car) with the same powertrain. whether or not it runs 12's, it should still be a blast to drive!
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Ditch the single plane and get an RPM air gap. With the 4000+ raceweight its gonna need all the low to mid range torque you can get out of it. Also you do not want anymore than 1 5/8" primarys on it or your gonna shift the torque peak to high. You want a hard hitting mid range motor to move that heavy beast.
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To make it into the 12's you'll need about 450 hp to get there consistently. I like the sound of the 236/242 cam that was suggested.
At 4,000 pounds with a small motor you're simply not going to build a lower rpm torque motor and try to grunt a 4,000 pound truck hard out of the hole with a little 350.
If you are willing to I would send the converter in and get it made to stall around 4,500.
If you're running a 26" tire you'll be running at least 115 mph with a 4.10 at 6,300 rpm and if you only have power to run 100 mph you can see you'll obviously need more gear.
To run 12's with the cams like you're talking about running you are going to need a gear change for sure and a higher stall will really help. I'd think something like a 4.56 if you're running a 26" tire, if you're running a 28 or 30, you'll need even more gear than that.
At 4,000 pounds with a small motor you're simply not going to build a lower rpm torque motor and try to grunt a 4,000 pound truck hard out of the hole with a little 350.
If you are willing to I would send the converter in and get it made to stall around 4,500.
If you're running a 26" tire you'll be running at least 115 mph with a 4.10 at 6,300 rpm and if you only have power to run 100 mph you can see you'll obviously need more gear.
To run 12's with the cams like you're talking about running you are going to need a gear change for sure and a higher stall will really help. I'd think something like a 4.56 if you're running a 26" tire, if you're running a 28 or 30, you'll need even more gear than that.
It needs a bigger carb, and everyone will disagree with me on that.
I had a 1988 Sierra 2500 (3/4ton) with a 1972 357ci stock lower end, 336x heads hogged out by me with 1.94/1.50 valves, 10.4:1 compression, comp truck cam i forgot hydraulic flat tappet, perf rpm air gap, 750 carb, th400, 3500 rpm converter, 3.42 gears, 32" tires, Fab-Tech lift.
It ran 12.3 at 111mph.
Sorry man I have a 1966 C-10 (5200 w/ me in it) w/ a 454 / Th400 I've messed w/ this thing for months and its hard to get into the 12's w/ these trucks. I know mine weights more but I have alot more motor than you do also... You're going to have a put some big CI in the truck to make it scoot!!! I'm about to do a 496" setup and see how she blows!
Doc
Doc
