65327
Forum Newbie
Posts: 24
Loc: ohio
Reg: 05-13-12
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05-20-12 04:53 AM - Post#2227760
I have a 65 327,462 heads, 300hp intake, holley 650 dp,comp 254H cam, muncie M21 4spd, 4.88 gears. intial timing is 12*, vac advance is about 10*, my total is only about 32*. I understand sbc run best around 34-36? how can I get the extra timning in there??? carb mixture screw are out one turn and current vac at idle is 15". Vac starts to drop if I turn them out anymore.
I got the Mr.Gasket advance spring kit, I used the bushing under the plate, used the silver and black springs and it was ok, went to the black and gold springs and it was much better. I wanted to try the black and gold combo but didnt want to mess with it as its running pretty good, Do you think the black and gold would be even better??
Edited by 65327 on 05-20-12 04:57 AM. Reason for edit: No reason given.
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impala
Senior Member
Posts: 1142
Loc: Pittsburgh, PA USA
Reg: 07-13-00
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05-20-12 01:59 PM - Post#2227921
In response to 65327
I don't think the advance spring kit will give you more total advance. It will just give you advance quicker.
you either need to get an advance timing light, set the dial at whatever advance you want and turn the dist until the mark lines up with zero or put degree tape on the balancer and use a regular timing light. With the total advance method you disregard initial timing. Of course you have to be aware of pinging.
impala
61 Impala Convertible, AACA senior
94 Jaguar, XJS, V12 coupe
11 Silverado
03 Impala Sedan |
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65327
Forum Newbie
Posts: 24
Loc: ohio
Reg: 05-13-12
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05-21-12 05:09 AM - Post#2228117
In response to impala
I have a timing tape on it now and am using a regular timing light. If I rev it up and turn the dist to get the 36*, that will probably put my initial around 16* or so won't it and probably ping?? I was wondering how to get to 36* without raising the intial. You may be telling that, and im just not getting it. If I take that bushing off of the bottom of the plate that came with the spring kit, will that allow the weights to swing out farther giving me the few extra * of time that I need. ??
Oh, this is a points dist.
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leon phelps
Valued Contributor
Posts: 3048
Loc: Croydon Manor, PA
Reg: 06-04-05
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05-21-12 06:11 AM - Post#2228139
In response to 65327
not trying to offend here, put it in different places then take it for a run. if you mark in on the intake, you can always move it back to a previous spot if it will not run and you are out on a drive.
lots of people have lots of different preferences with timing. some want fast, some want economy, some want easy starting.....
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impala
Senior Member
Posts: 1142
Loc: Pittsburgh, PA USA
Reg: 07-13-00
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05-21-12 03:19 PM - Post#2228317
In response to 65327
I have a timing tape on it now and am using a regular timing light. If I rev it up and turn the dist to get the 36*, that will probably put my initial around 16* or so won't it and probably ping?? I was wondering how to get to 36* without raising the intial. You may be telling that, and im just not getting it. If I take that bushing off of the bottom of the plate that came with the spring kit, will that allow the weights to swing out farther giving me the few extra * of time that I need. ??
Oh, this is a points dist.
Like Leon says, it's trial and error. Just set the total to what you think you want it to be and test ride. If it pings try better gas. Too much advance will also give you hard starting.
We used to run the big blocks at 38-40 degrees total with race gas and completely disregarding initial advance. No they wouldn't easily start but fortunately our local drag strip had a down hill staging area to catch it in gear.
You should find a strip with test and tune days so you can experiment and see what works best.
impala
61 Impala Convertible, AACA senior
94 Jaguar, XJS, V12 coupe
11 Silverado
03 Impala Sedan |
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 vet65b
"3rd Year" Silver Supporting Member
Posts: 224
Loc: Albuquerque, NM
Reg: 02-09-06
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05-21-12 03:49 PM - Post#2228326
In response to 65327
65327,
You have already been given good advise, here's what Makes my 300 horse 327 run best; I have installed a vacuum can (Delco #236) which gives me 16.5* advance at eight inches manifold vacuum or higher. With 12* initial (set with the vacuum can disconected and idle speed below where centrifugal starts) this gives me 28.5* advance with everything hooked up at idle. It starts easy and does not try to kick back. I have limited my cent. advance to 22-24 degrees, this combination gives me 34-36 degrees advance at wide open throttle and 52.5 degrees at cruise. Using high test 91 oct. the above combination works well for me at the 5200' elevation I live.
You really could use a dial-back timing light, makes things a lot easier. Let us know how this works out. Back to the garage! Bill
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65327
Forum Newbie
Posts: 24
Loc: ohio
Reg: 05-13-12
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05-21-12 04:08 PM - Post#2228334
In response to vet65b
Thanks to everyone. I will play with it some and may also try the 236 can, I have the B1 can now. I think the B1 is giving me 10* vac advance. Do you know what car the delco 236 can came in? the guys at my local stores say they cant just type in the number on the can, they need a part number or the car it came in to find it. Thanks for your help guys.
Edited by 65327 on 05-21-12 04:11 PM. Reason for edit: No reason given.
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 427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12320
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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05-21-12 09:37 PM - Post#2228461
In response to 65327
However you curve the timing, just don't exceed 36º total advance for your street engine.
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BBChevro
Contributor
Posts: 109
Age: 54
Loc: Qld., Australia
Reg: 03-31-12
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05-22-12 03:41 AM - Post#2228505
In response to impala
... Too much advance will also give you hard starting.
We used to run the big blocks at 38-40 degrees total with race gas and completely disregarding initial advance...
That brings back memories - I used to run mine with as much advance as I could, I had a toggle switch under the dash that I'd spliced into the wire going to the coil - I'd leave it in the off position while I hit the starter, then flick it on - easy starting every time.
Mark
Mark
There is light at the end of the tunnel..... hopefully, it's not a train. |
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vet65b
"3rd Year" Silver Supporting Member
Posts: 224
Loc: Albuquerque, NM
Reg: 02-09-06
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05-22-12 03:37 PM - Post#2228717
In response to 65327
65327,
The 236 can was used beginning in '64 on HP small block motors with HP ratings of 365 and 375 HP. Also in '66 '67 on 350 horse 327's. Back to the garage! Bill
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65327
Forum Newbie
Posts: 24
Loc: ohio
Reg: 05-13-12
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05-27-12 04:21 AM - Post#2230234
In response to vet65b
I have an up date on the performance of my jeep.
Well,, I was out driving around lastnight and came to a redlight. I was about the fourth car back and the next lane only had one car at the light, when this bad a.. looking and sounding mustang creeps by me and revs his engine way up and pulls up behind the car at the light and revs it up again.. I thought to myself "why not" I've been wanting to know how the jeep will run, what better way to do it, (I was a little intimidated). The light turned green and when I could I got up next to him, we played the speed up alittle and let off game for a few then finally got to a redlight side by side. It was a teenage kid with his girlfriend. We gave eachother a nod and when the lightt turned green we went!! I got him off the line by about a half car then shifted to 2nd and TOTALLY MISSED IT (nothing but high reving engine). He must have known it because he let off just as he went by me, I hit 3rd and got back beside him and again we nodded and hit it. We went neck and neck all the way down the road neither one of us could gain an inch on the other. He let off of it about he same time I did as we were getting pretty fast on a usually pretty crowded stretch of road.
So I am pretty happy with the performance of my jeep after that. If I can run with a bad censored looking mustang with big 35X15.50 tires, IM HAPPY. OH, OH, I almost forgot (this is the best part of it). There was a girl in a slightly lifted yellow wrangler following us and trying to keep up, when we were done racing and the mustang was at a light, she drove by him shaking her head, like I don't think so... It was pricless. I am going to do a compression test anyway just for peace of mind, but i think it is running just fine, I am wondering if those big, wide tires just made me think I wasn't going as fast as I actually was. Thanks for all the help
Edited by 65327 on 05-27-12 04:23 AM. Reason for edit: No reason given.
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66cayne
Frequent Contributor
Posts: 1810
Reg: 08-06-08
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05-27-12 06:35 AM - Post#2230263
In response to 65327
ah yes, the young and dumb days...
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65327
Forum Newbie
Posts: 24
Loc: ohio
Reg: 05-13-12
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05-27-12 08:09 AM - Post#2230282
In response to 66cayne
thats what it reminded me of, the young days. its been a long time since Ive done that kind of thing. It was fun though.
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