Newly built 355, Need help with timing
Thread Starter
Registered User
Joined: Dec 2012
Posts: 15
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From: Windsor, Canada
The balancer is brand new, its a Dorman made-in-china piece. the only chinese made part on this motor. But I am also trying to run 87 octane. The timing tab is part of the Spectre timing cover that is also brand new. it goes in place with two bolts on the driver side to view the timing mark. while the motor had no heads on i made sure that the markings were correct and they were.
while not running vacuum advance i am reading 8 deg advance at idle, but i cant tell what my total timing is at all, but anything more and i start to detonate (very little)
4.030" bore, 3.480" stroke, felpro head gasket, 67cc combustion chamber, 87 octane gas. I must have a loosey-goosey set of springs in my distributor (the distributor is stock and it was the same one that ran on the original bone-stock 305 that was in the car)
while not running vacuum advance i am reading 8 deg advance at idle, but i cant tell what my total timing is at all, but anything more and i start to detonate (very little)
4.030" bore, 3.480" stroke, felpro head gasket, 67cc combustion chamber, 87 octane gas. I must have a loosey-goosey set of springs in my distributor (the distributor is stock and it was the same one that ran on the original bone-stock 305 that was in the car)
Agreed, 9.3/1 cr isnt a whole lot, but its enough to cause detonation
ive personally had 3 different 1985 monte carlo ss all with a computer controlled HEI without a vac adv. all had a 5 pin module and was carbureted. And I also had an 87 GMC Sierra with a 350 TBI and It had the smaller dist w/ an external coil with i believe the same 5 pin module
Thread Starter
Registered User
Joined: Dec 2012
Posts: 15
Likes: 0
From: Windsor, Canada
How might i find a re-curve kit for my distributor and possibly an HEI module? mine is a 4-pin. Its from a 1985 4bl carb 305
I dont know which springs im supposed to use for the mechanical advance and would a better HEI module be able to take the place of a vacum advance?
the motor it used to run was a chevy 305 with 58cc heads biggest valves and replaced the rubber cam with another hyd flat tappet cam that made .454" lift (cant remember all the specs)
i am wondering if this could affect the performance i am getting from my current ignition?
My plugs are AC Delco with i believe a .045" gap, what plug would you recommend?
I dont know which springs im supposed to use for the mechanical advance and would a better HEI module be able to take the place of a vacum advance?
the motor it used to run was a chevy 305 with 58cc heads biggest valves and replaced the rubber cam with another hyd flat tappet cam that made .454" lift (cant remember all the specs)
i am wondering if this could affect the performance i am getting from my current ignition?
My plugs are AC Delco with i believe a .045" gap, what plug would you recommend?
Last edited by stevo1988; Jan 7, 2013 at 11:01 PM.
Thread Starter
Registered User
Joined: Dec 2012
Posts: 15
Likes: 0
From: Windsor, Canada
I think i might purchase an HEI Tune-Up Kit from Pertronix.
Pertronix D8000 - Flame-Thrower Distributor Tune-Up Kit
Link from JEGS website
for $115 thats not too bad and maybe with the mechanical re-curve set and the adjustable vacuum advance unit I will be able to dial in my timing correctly. I am also planning to get a dial-back timing gun as well. And all the other goodies in this kit should spice up my ride quite a bit!
Has anyone had any experience with Pertronix? If so does anyone know if their HEI Kits are any good. I know it seems that MSD is the cat's *** these days but with my mild build would i see alot of benefits with the Pertronix kit?
Pertronix D8000 - Flame-Thrower Distributor Tune-Up Kit
Link from JEGS website
for $115 thats not too bad and maybe with the mechanical re-curve set and the adjustable vacuum advance unit I will be able to dial in my timing correctly. I am also planning to get a dial-back timing gun as well. And all the other goodies in this kit should spice up my ride quite a bit!
Has anyone had any experience with Pertronix? If so does anyone know if their HEI Kits are any good. I know it seems that MSD is the cat's *** these days but with my mild build would i see alot of benefits with the Pertronix kit?
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