SB’s and Converters.
#3097924
11/28/22 08:31 PM
11/28/22 08:31 PM
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Joined: Jan 2003
Posts: 9,146 Now - Port Orange,Fla. Former...
MIKES_DUSTER
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
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[b][/b]Soooooo, I know this is a BROAD question and answer but a friend of mine, John and I were talking today about converters and the subject came up, what is a good size and stall/flash for a SM?? Now, I know I’m going to get LOTS of people saying, “ there’s too many variables!!!!!” and I know that, so tell us your setup and the size/stall/flash of your converter.
I have a stock stroke 360 .040 and my converter is a 8” 4,200. I was thinking of going up to 5,000 but not sure.
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Re: SB’s and Converters.
[Re: MIKES_DUSTER]
#3097926
11/28/22 08:49 PM
11/28/22 08:49 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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[b][/b]Soooooo, I know this is a BROAD question and answer but a friend of mine, John and I were talking today about converters and the subject came up, what is a good size and stall/flash for a SM?? Now, I know I’m going to get LOTS of people saying, “ there’s too many variables!!!!!” and I know that, so tell us your setup and the size/stall/flash of your converter.
I have a stock stroke 360 .040 and my converter is a 8” 4,200. I was thinking of going up to 5,000 but not sure. My son ran a 5600 stall in his stock stroke 360 and ran 6.54 at 3200 pounds.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: SB’s and Converters.
[Re: DusterKid]
#3098049
11/29/22 11:27 AM
11/29/22 11:27 AM
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Joined: Oct 2004
Posts: 2,820 Connecticut
FurryStump
master
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master
Joined: Oct 2004
Posts: 2,820
Connecticut
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I have gotten two PTC’s through John Cope. One for a 727 and one 904. Very happy with them both. Filled out the spec sheet and even with my “unusual” combo the flash is spot on what I asked for. I did send a sheet directly to PTC, and got a three word email response, that to be brutally honest, was enough to tell me that whoever looked at my sheet had no idea what I was doing with the car. Even though I wrote an essay on the sheet and I know they have built converters for the class. Though to be fair, what I need is pretty unusual, so they are definitely NOT the only ones to not understand. Never received a response from two others I sent sheets into. They were both 9.5”, the 727 flashed to 3340, the 904 flashes to 3500 according to the data.
Last edited by FurryStump; 11/29/22 11:28 AM.
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Re: SB’s and Converters.
[Re: FurryStump]
#3098143
11/29/22 04:39 PM
11/29/22 04:39 PM
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Joined: Jan 2003
Posts: 6,139 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,139
Melbourne , Australia
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I'm going to test my memory here. I pieced togther a 360 many years ago for a friend of mine. The basics of it were: 4.04" KB 190 pistons, the compression was around 11.5:1 Ported cast iron J heads with Manley 2.02"/1.60" valves Port matched Edelbrock RPM Air Gap intake Mighty Demon 825 carb HVH 2" Super Sucker spacer Solid F/T camshaft 252/258 @ 0.050", 1.6:1 Crane rockers, Valve lift was around 0.585", 108 lobe separation 1 3/4" x 32" 4 into 1s with a 3" collector It made 495hp @ 6300, 471 ft/lbs @ 4800 We ran an 8" convertor that flashed to around 4800-5K from memory. It ran low 11's at 119 mph, trans was a A904 with a factory gear set
I've got a 360 of my own sitting at home that's similar, we built it up using parts we had lying around: 4.03" KB191 pistons, the compression is up around 13:1 (to be honest, I've not calculated it) Ported cast iron truck heads, 2.02"/1.60" chevy Ferrera valves Heavily modified M1 Intake HP Holley 950 that I borrowed for the dyno test 2" open spacer with a 5 degree shear plate Howards F/T camshaft, Crane 1.6:1 rockers, 268/276 @ 0.050", 106 lobe separation, Valve lift was around 0.686" 1 3/4" headers we had lying around, they were out of a Challenger, no idea who made them. That engine made 520 hp @ 6800, peak torque was around 490 ft/lbs @ 5200 or 5300 If I wasn't making some changes to that engine, I'd throw a 8" convertor that flashes to around 5300-5500
If I was racing with a 2 speed glide, I'd have the flash speed higher again
I hope that gives you some insight Mike
Cheers
Last edited by LA360; 11/29/22 04:46 PM. Reason: I forgot to mention the transmission used
Alan Jones
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