What do you fellas usually set your timing on a SBC? I've heard so many
different settings..... I've heard SBCs run best at 4 degrees advanced and
I've heard of some people going as high as 12 degrees...... what do you
Also, I just bought another 1984 Z-28 (which I'm going to be checking the
timing on tomorrow) 8th digit G code (L69 HO) it has factory 3.73 gear
ratio...... but doesn't have the factory 5.0 HO....... It was replaced with
a GM Goodwrench 350 from the dealer about 80,000 miles ago. Also the tranny
was replaced with a TH350 not long ago with a B&M shifter, Autometer trans
temp gauge and a pretty nice shift kit because it still barks 2nd and even
3rd under hard accceleration......
I'd like to add a set of shorty headers, Edelbrock performer intake (which I
have) and maybe a matching Edelbrock cam kit......... and I will be using
your advice and leaving the quadrajet and computer alone....LOL!!!!!!!
Do you know what the factory HP rating are on the GM Goodwrench replacment
350 motors? Are they around 200HP?
I also have a set of the 5.0 HO 58cc heads in the garage..... are these
heads worthy of bolting on the Goodwrench 350? Would it make anymore power?
Or would it not make enough difference to even bother? Anyone ever used the
HO heads on a 350 short block?
What power levels the motor put out could be any where from 150,
to over 300. It all Depends on which 350 parts counter engine it is.
On modified engines, there is no set 'this works best' timing degree
mark. It is a combination of factors that determine what initial timing
works best, and what distributor advance works best.
For a relatively stock Crate motor, find out which one it is. From
their you can find out what initial timing GM recommended for it. They
using a dial back timing light (unless you hear like I do), play around
with it. You might end up a couple of degrees off from what GM said
As for your question in your other post, 305 heads on a 350
are a waste. Your choking down the engine. Sure you may get 58CC
combustion chambers, razing your compression ratio, but you will not
get big valves. If you want to spend some money on some heads, I
have a used set of Dart II heads on my 383 SBC. With the crane rocker
rollers Ill let them go for $1,500, minus the 383 short block. Ill
sell you the complete running 383 for $2,200. For $2,800 you can drive
it home in the 73 Chevy truck it's in.
I agree with Charles, you need to get with GM and get their initial
recommendations and go from there.
The Goodwrench performance division likely has a tech line you can call. Ask
any GM dealer for the information, they should have it. Or google it and it
will likely show up. You can also try AC Delco, they may be able to help.
If it were my SBC (If I owned one), I would set it stock because the motor
would be as such :).
Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director
'80 Carousel Red Turbo T/A, 27k orig.
'79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig
'84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....
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