ceheler
Well-known member
- Joined
- Sep 29, 2014
- Messages
- 53
- Reaction score
- 2
- Location
- Durham, Ca
- My Car
- 1971 Mustang
351C 4V - slightly modified
C-6
9" Rear factory 3:00 gears
Alright all you fine folks im hoping one of you knowledgeable people can point out the obvious for me. Today i finally got to tuning my Holley 670 for my car. Its a 351C 4-V with a little pocket work on the quuence heads with a lunatic mild cam (https://www.lunatipower.com/Product.aspx?id=1621&gid=287) cam specs. edlebrock performer manifold hooker headers comp cams roller rockers electric fan conversion whole engine hs only about 15k since build maybe 20k hopefully i didnt forget something if i did ask me and i will do what i can.
Problem:
i replaced to plugs to aid in being able to read new ones vs old ones. Upon removing them i noticed a few were cleaner than others figured hey whatever. I put the new ones in after setting float levels and dialing in the idle circuit with a vac gauge and setting idle. Put in 70's from the factory 68s knowing that it was running lean already. Drove down the road and cruised it at 2500 for a couple mins then shut it off and pulled into an orchard (luxury of living in the country) and pulled cyl 1 and it looked just like i had put it in. pulled number two and it looked lean. Threw in some 72's and repeated and pulled #1 and again looked brand spankin new not lean i mean like it was shielded entirely from everything in the cylinder. Pulled #2 and it looked a little closer but still lean. put in 74's and ran down to the shop. Let it cool down a bit and pulled the whole bank out and 2 and 3 looked PERFECT and 1 and 4 look completely new. like i just took them out of the box.
Any thoughts? The thing runs great idles good pulls good
Problem:
i replaced to plugs to aid in being able to read new ones vs old ones. Upon removing them i noticed a few were cleaner than others figured hey whatever. I put the new ones in after setting float levels and dialing in the idle circuit with a vac gauge and setting idle. Put in 70's from the factory 68s knowing that it was running lean already. Drove down the road and cruised it at 2500 for a couple mins then shut it off and pulled into an orchard (luxury of living in the country) and pulled cyl 1 and it looked just like i had put it in. pulled number two and it looked lean. Threw in some 72's and repeated and pulled #1 and again looked brand spankin new not lean i mean like it was shielded entirely from everything in the cylinder. Pulled #2 and it looked a little closer but still lean. put in 74's and ran down to the shop. Let it cool down a bit and pulled the whole bank out and 2 and 3 looked PERFECT and 1 and 4 look completely new. like i just took them out of the box.
Any thoughts? The thing runs great idles good pulls good