[dlw6767]

Hey guys i need some help.I just fired up my new motor in my 65 gto its a 68 400 comps 490 lift cam,65 tripower and im seeing some same issues i saw with my other motor i had in it. 2 diff things i guess..one is right side number 2 and 4 seem to run lean, its sputters some out of right tail pipe, if i hold my hands near both tail pypes the left side is way hotter..i have number 65 jets in the primary carb. also my concern is the distributor set up..its stock with stock points and it has a acell adjustable vacum advance..i dont think its working right half the time..I set timing at 10 degrees with vac line unhooked and the plug it in and get no change sometimes. im trying to keep this very stock appearing and would like to keep the dist and points etc..can anyone or can you recommend someone who can supply me with a correct vacum advance for my dist OR a complete dist set up for tripower specs? also when the car is idleing the dist hose has vacum is this right also?

[dlw6767]

also are the valve covers on right for a 65 tripower motor?

[Sirrotica]

Sounds like you could possibly have a vacuum leak on those 2 runners, especially if it went from one engine to the other with the same manifold. If you have it bad enough to have 2 cylinders not firing it has to have an extremely rough idle. But there could be a bunch of reasons for a miss at idle, just throwing the vacuum leak out there as you said the symptom is the same on different engines.

Oil fill cap should be on the left side of motor and I believe there is a rubber plug in the right cover. Going from memory of working at a Pontiac dealership on the grease rack back in 1969, hope my memory is still good on that point. If I'm not right someone should be along shortly to correct me.

If your using 389 covers on 400 heads do you have spacers so they'll clear the rocker arms. Although they bolt on as soon as you start it you'll have 16 dimples in the stock covers. Had to find that one out the hard way and ruined a set of good chrome covers back in 1970.

A member here on PY goes by Suntuned is quite good at setting up older distributors. He may have the correct advance cans for yours and if you want it right he does mail order recurve and rebuilding. Your bushings or cam in the distributor may be worn out too.