Re: new to the forum 383 question
[Re: cwilson66]
#2764804
04/16/20 09:00 PM
04/16/20 09:00 PM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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You would be a lot better off swapping the heads to a set of aluminum like the Edlebrock 88.0 CC Street RPM heads and use the 1009 head gasket The aluminum heads act like they lower the compression by sucking heat out of the combustion chambers as well as they flow more air making more power with bigger valves BTW, I hate the Mopar cams like the one you have There are a lot of better grinds out there now so I would change it while it is apart and make that motor run a lot better What year and body style car are you going to run this motor in and what rear gear ratio and rear tire size? IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: new to the forum 383 question
[Re: cwilson66]
#2764966
04/17/20 10:43 AM
04/17/20 10:43 AM
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Joined: May 2005
Posts: 136 Ontario, Canada
500ciBee
member
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member
Joined: May 2005
Posts: 136
Ontario, Canada
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Hi Connor...I have a very similar engine combo. It came with the car and I have been making the best of it while trying to build another engine. I have similar pistons that are TRW 2293. It has about a 20cc dome. fast68plymouth suggested that I check the volume of my 906 heads and I came up with a chamber of about 92cc. In all my compression ratio turned out to be about 9.8:1. This is what my numbers looked like in the calculator that I used. Yours might be similar.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: new to the forum 383 question
[Re: 500ciBee]
#2764998
04/17/20 11:36 AM
04/17/20 11:36 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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not sure what your 94 octane is up there but 10.4 imnho is too high. When done be sure to dial in your timing & A/F ratio. until someone chimes in for sure on it you could take a compass & some paper & do some mocking up & at least see what that looks like. Good luck on it!
live every 24 hour block of time like it's your last day on earth
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Re: new to the forum 383 question
[Re: topside]
#2765215
04/17/20 07:29 PM
04/17/20 07:29 PM
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Joined: Dec 2012
Posts: 257 Alberta
440_Offroader
enthusiast
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enthusiast
Joined: Dec 2012
Posts: 257
Alberta
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I don't think that's a great street combo with 3.23s in a fairly heavy car. Too much cam & converter, IMO. Sure, it'll sound nasty, but under 3500 it's gonna be pretty soggy. 10.4 is a lot with iron heads, even with all the overlap in the 484 & 509 MP cams. I agree, the combo isn't very good. The engine might run in a higher elevation though... You live in the Rockies... 4000+ ft?
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Re: new to the forum 383 question
[Re: 440_Offroader]
#2765972
04/19/20 02:37 PM
04/19/20 02:37 PM
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Joined: Jan 2003
Posts: 1,307 BC, Canada
Black_Bee
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,307
BC, Canada
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I don't think that's a great street combo with 3.23s in a fairly heavy car. Too much cam & converter, IMO. Sure, it'll sound nasty, but under 3500 it's gonna be pretty soggy. 10.4 is a lot with iron heads, even with all the overlap in the 484 & 509 MP cams. I agree, the combo isn't very good. The engine might run in a higher elevation though... You live in the Rockies... 4000+ ft? Agree with others... a 383 with the .509 cam and 3.23s is going to be very lazy. I ran a 383 with the TRW version of those pistons, a much smaller "484" sized Comp cam, 3500 converter, and 3.91 gears, and it was a real dog off of the line and a chore to drive around town. FYI, my pistons were 0.005" in the bore and something like an actual 11:1 with the FelPro gaskets, and I ran pump gas just fine. You weren't asking for advice on the combo, and cam swaps are expensive these days, so just drive it and see how you like it... although it might be an easier time to do a cam swap if the engine is out of the car.
Paul '69 Super Bee 383 EFI Turbo
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