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  #16 (permalink)  
Old 07-03-2012, 04:56 PM
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it shouldn't, but if it's black or grey, it's just running a little rich. tinkering with/ adjusting the valves correctly can make it more fuel efficent and thus, run a little rich.

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  #17 (permalink)  
Old 07-03-2012, 05:55 PM
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The exhaust seats are hardened for use w/unleaded fuel, not the valves.

I totally agree w/Greg T. Putting new lifter on an old cam is just begging for trouble. IMO there is NO "right" way to mix new and old cam and lifters. Period. The ONLY thing that might save you is the old worn out valve springs are probably down to 50 lbs on the seat.

Just the same, I wouldn't ever do it (see Item #18 here). The only way to try to repair bad lifters is if the lifter body is OK, the guts can be removed and replaced w/new guts from a new, identical lifter, as mentioned here.
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Old 07-03-2012, 07:30 PM
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Quote:
Originally Posted by Greg T View Post
Can't put new lifters on an old cam.
.
I did it on a '77 Nova with a straight 6 cyl at about 30K with no problems and the car had 142,000 when I sold it only because the body was going bad.
I bought the new lifters from GM Chevy dealer, oiled them well, and used plenty of assembly lube.
Terry
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Old 07-04-2012, 06:19 AM
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Reused the old lifters,,,they sound good now buy just a little smoke,, could be from theanks tranny fliud in the line , cause when i cganged the modulator valve there was fluid in the line ,,,or could be running a little rich,,,it does burn your eyes a little ,,,1 other thing is after i changed the modulator valve it shiftes better but takes too long to change ,,can i adjust the passing gear linkage to fix this ,,, i get a little diesel sound right befor it changes,,

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Old 07-04-2012, 07:12 AM
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Originally Posted by lilrobo View Post
Reused the old lifters,,,they sound good now buy just a little smoke,, could be from theanks tranny fliud in the line , cause when i cganged the modulator valve there was fluid in the line ,,,or could be running a little rich,,,it does burn your eyes a little ,,,1 other thing is after i changed the modulator valve it shiftes better but takes too long to change ,,can i adjust the passing gear linkage to fix this ,,, i get a little diesel sound right befor it changes,,

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The eye watering exhaust is unburned hydrocarbons. This is a fancy way of saying there's not enough initial timing, most likely.

If you are hearing detonation and not the bearings rattling, the detonation right before the shift is also likely related to the timing, this time too much. I would recommend you recurve the distributor. Start from scratch and set it up like you would most any "performance" curve (as opposed to a stock curve). The info on this page was originally about the GM V8 HEI but the timing info works for many apps, just change the initial and total amounts of timing to suit the engine being tuned.

If you are strapped for time and you know the total timing is OK where it's at, you can try hooking the vacuum advance up to manifold vacuum and put a one-step heavier advance spring on ONE side and retest. Changing the vacuum advance vacuum source to manifold will speed up the idle if you were using ported vacuum. Reset the idle speed and be sure to readjust the idle mixture screws.

The modulator shouldn't change the WOT shift points. Be sure there's no leaks in the vacuum line and that it's tight on the modulator. You can readjust the detent cable and see if that helps.

Last edited by cobalt327; 07-04-2012 at 07:29 AM.
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Old 07-06-2012, 07:52 PM
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well i thought i had everything fixed ,,, well i was about 15 miles out ( it was hot ) and it start ticking again real loud so i limped on to our restaurant and i check out the engine department and i saw anti freeze around the radiator and a large spot of oil underneath so after we eat i got 3 large water to go ( for radiator ) and started it up and it sounded fine until, about 15 miles back and it started again,, i made it back home, i guess i need lifters they just not holding pressure i guess .so i will need to fix the rear seal, flush rad ( or replace ) add fan shroud ( maybe ) and work on lifters....so back to work huhh
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