The combo will have to produce enough HP to cross the stripe at 7000 RPM with a 26" tire for 125 MPH. about 10.9 et
KB Dome Pistons in 383. Do you like them?
- Thread starter ValiantKindOfGuy
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ValiantKindOfGuy
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I also like the ring thickness.
Perfect for 4.30s in the rear. I still don't see why you think 383 cubes with 270+ cfm peak heads with good mid lift numbers would have any problem producing enough power for a 2900# car to run 125mph in the 1/4, it could do better if I wasn't talking a daily driver. Not being a jerk I just don't understand if I'm missing something
probably looking at 4.57 gear
ValiantKindOfGuy
Well-Known Member
To cross the traps at 125 with a 1:1 4th on a 26.2in tire it would be near perfect with a 4.30. Wouldn't be able to run the mph with a 4.56/7
Here they are at CNC motorsports, BB Chrysler 383 Icon Forged Pistons Dome 4.5cc 4.310 Bore IC687-060 but shop around, of course. With the 74 CC chambers and FelPro 1009 head gasket at zero deck you'll have 11.05:1. But, being a forged piston will require extra bore clearance and have a little more piston rock at TDC a thicker gasket for a safety margin isn't a bad idea. The still yet appallingly expensive TFS Cometic head gaskets with a 4.38 inch bore and and .051 compressed thickness will give you a slightly lower compression ratio of 10.7:1. But, if your having a custom cam ground, you get it set up to bleed enough cylinder pressure at low rpm to be docile enough to putt around on 93 octane, and once to the track top off with race gas. Putting a timing retard control in the vehicle makes this a lot easier to get by with.
ValiantKindOfGuy
Well-Known Member
Thank you very much for the link. I may go with a .051 gasket just to stay a LITTLE safer. I can always Pull the heads and throw a .039 in it if I decide to run Ethanol later down the line. I think I will be running the Icons. They are better all around for the goal on the engine.
camshaft specs ? ballpark
ValiantKindOfGuy
Well-Known Member
Not sure yet. Lots of factors to consider that haven't even been resolved in my own planning.
A modern version of the MP 590
ValiantKindOfGuy
Well-Known Member
Decent specs. Not a bad ballpark. A lot of things a real cam guy like Ed Curtis could do to make a cam magic but appear bland at face value. I'm not all knowing when it comes to cams I'm just ok at best. So I'd say that's a relative ballpark. I'd like to see more lift but like I said I'm just ok.
transmission ?
ValiantKindOfGuy
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Faceplated TKO
yellow rose
Overnight Sensation
I wouldn't run lesss than 11:1 because there is no reason not to if you are getting a custom grind.
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ValiantKindOfGuy
Well-Known Member
I agree.
I know that the OP stated he's going to run a flat tappet, but I've been wondering lately what it would take to convert the old MP 590 specs to a roller.
Call up a cam company, tell them your idea. However, they could duplicate that cam or turn up the cam via a more aggressive lobe. It should t be a problem. Though I’m sure they have there own competitive version.
There was an excellent camshaft shoot out article staring a pair of MP cams. One being the .590, the other, the .557 lift mechanical cam. They faired very very well even though there ramps, max lifts, etc... on all the cam stuff, isn’t a full balls out race unit unlike some of the other cams tested.
ValiantKindOfGuy
Well-Known Member
Link to shootout? Solid flat on a Mopar lifter allows a pretty bad *** profile for a flat tappet. Mopar and AMC (I have a 69 AMX as well.) got with the program for lifter diameter.
It’s not all about max power but power under the curve. This is a 5 or 6 small block cam shoot out. The 2 MP cams are the .557 lift and the .590 lift cams vs others of comparable size or what that manufacturer suggested as a better cam to best the MP. In which, there specs were something a good bit larger.
https://www.hotrod.com/articles/mopar-performance-purple-shaft-camshaft/
https://www.hotrod.com/articles/mopar-performance-purple-shaft-camshaft/
ValiantKindOfGuy
Well-Known Member
Thank you for the link.
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