Search results

  1. rich weyand

    Motor stalling when slowing to turn or stop

    You can't run the Edelbrock carb (5-6 psi max) off an electric fuel pump (14 psi typical). You need a fuel pressure regulator. It goes right in line with your filter.
  2. rich weyand

    Motor stalling when slowing to turn or stop

    Does it smell like it is rich? Do you have a fuel pressure regulator in the line to the carb? What is your timing set at? Is your vac advance hooked to ported or manifold vacuum?
  3. rich weyand

    already want a bigger cam

    All of the cams we are talking about are in the same ballpark, and are about all you can do (assuming 4bbl, dual-plane, and headers) without going to higher compression pistons or different heads. The simulated dyno curves hardly move at all.
  4. rich weyand

    already want a bigger cam

    I just ran those two cams on camquest with the 350 parameters. I'm not sure you'll notice much difference between the 12-206-2 and the 12-300-4. A little more torque in the very bottom, but maybe not enough to notice.
  5. rich weyand

    Stumped

    Yup, 1978 is last year for no pollution controls on C20, C30, K10, K20, K30. Make sure the timing is set right. If the distributor is not clamped tight, it will drag retarded and you will see this issue. BTDT. Timing is simple. Disconnect the vac advance line. You don't have to plug it...
  6. rich weyand

    Gas leak help?!??!

    If you get the return hoses mixed around, you can be drawing fuel from one tank and returning it to the other. This is the only way I know to get gas coming out at the rate you observe.
  7. rich weyand

    No power up hill or after 45 MPH

    Also check your timing. If the distributor was not clamped down tight, it can drag retarded, and performance will be as you say. BTDT.
  8. rich weyand

    need question answered

    Ford had a floor-mounted switch like that on the F-series trucks in the mid-70s. My dad had one on his 75 F-250. Sounds like somebody used the Ford switch when they put in the other tank. The Ford switch isn't Chevy OEM, but it works.
  9. rich weyand

    Lean MISFIRE! need help.???????

    If by "longest throw" on the accelerator pump arm, you mean the hole in the end of the lever, that is actually the shortest "throw". The longest throw is on the inner hole. You might know that. Just making sure, because I have seen people get that backward.
  10. rich weyand

    290hp 350 heads upgrade?

    He could put shorter tires on it and get a lot more whoopee. Are those 33s or 35s or something? Going shorter is like changing the rear end ratio.
  11. rich weyand

    Bad Combo?

    You're right in that the Holley instructions say that. Funny they should get that wrong. The forums administrator on the Holley site clarifies that ported/timed vacuum is only for emissions-controlled engines here, however...
  12. rich weyand

    Bad Combo?

    Yep, no knock sensor on pre-ECM engines (through 1978). So if you are losing the ECM and going HEI, you can lose that. If water temp sensor is on the side of the head between #1 and #3 plugs, with a green wire attached, that feeds to the temp gauge, so you need that.
  13. rich weyand

    Bad Combo?

    For the record, 1500 rpm is not off-idle. The 12-300-4 cam has 300+ lbft of torque at 1000 rpm. I can pop the throttle at a stop -- no brake torquing, no dropping the transmission into drive, just take my foot off the brake and punch it -- and spin both BFG 31x10.5s with a G80 and 3.73:1...
  14. rich weyand

    Bad Combo?

    This is NOT correct. Ported vacuum -- dropping the advance at idle -- is pollution nonsense. It fires the spark too late for the thin mixture and dumps the burning charge through the exhaust valves, out the exhaust runners in the head, and into the manifold. The AIR pump then adds air to...
  15. rich weyand

    Bad Combo?

    The exhaust pulses do not alternate sides. The pulses from right and left sides go as LRRLRLLRLRRLRLL, so the left side exhaust is L--L-LL-L--L-LL-L and from the right, same thing. When that double pulse occurs, the H-pipe allows the overpressure to vent to the other side and vice versa...
  16. rich weyand

    Bad Combo?

    Put a 2" H-pipe across, as far forward as you can.
  17. rich weyand

    Bad Combo?

    Valve timing -- No. You hook up the timing gears so the cam is zeroed. Ignition timing -- Not really. You can probably dial more base timing into the 12-300-4 than the stock cam. Firebane and I are running the 12-300-4 at 16* BTDC. But you can get the thing all running nice, then replace...
  18. rich weyand

    Bad Combo?

    But the intake and carb have to come back off to install the cam. Lots of extra work.
  19. rich weyand

    Bad Combo?

    That's not bad for all you get. You do need the lifters, no ifs, ands, or buts. 12-300-4 is stock lift (one thing to recommend it, you won't be beating up the valve train), so stock springs are OK, but why wouldn't you replace them while you're in there on an older engine. Same with timing...
  20. rich weyand

    Bad Combo?

    Yeah, it'll leak maybe a shot glass or two of ATF. Not too bad. If you do go with the 12-300-4 and need that part, PM me your address.
  21. rich weyand

    Bad Combo?

    The governor is behind a little cap retained with a bail on the driver's side of the transmission. Unsnap the bail, pull off the cap, and the governor just pulls out. Here is what it looks like. You break off the staked end of one of the hinge pins, replace one weight with one size heavier...
  22. rich weyand

    Bad Combo?

    For the carb it has to be in the 6psi range. Regulator should do it. Oh, BTW, that should be Hooker 2452 headers above. 2453 is for 4WD trucks like mine. So, to have it all correct in one place: HEI distributor (with built-in stock advances, or you will be fiddling with an adjustable one...
  23. rich weyand

    Bad Combo?

    So, lessee. A summary so far: HEI distributor (with built-in stock advances, or you will be fiddling with an adjustable one forever), SMI custom-tuned Qjet, on an Edelbrock manifold (make sure it's one of the ones for the spread-bore carbs), keep the TH350 but knock the shift points down 500...
  24. rich weyand

    Bad Combo?

    Here's a thought. Instead of the stock 235/75R15 (29" diameter) truck tires, put a set of BFG Radial TAs in 235/60R15 (26" diameter). Lowers the truck an inch and a half. Also makes that 3.08:1 (with 29s) effectively a 3.44:1. I did this on my Safari in the mid 90s. That thing was a pig...
  25. rich weyand

    Bad Combo?

    Couple extra thoughts. Tires is a cheap gear change: tires are more expensive than a used axle, but there's less labor. And if you need tires anyway, it's free. Shorter side walls will roll under less in cornering. Changing the governor on a TH350 is a half hour job, assuming it takes you...

Latest posts

Forum statistics

Threads
45,947
Posts
996,668
Members
39,143
Latest member
ash73
Top