Lets hear some more!

my dart has a never touched short form a 80's diplomat cop car that was wrecked when it was almost new and sat in the towns public works garage till 2 years ago it has heads from a 90's non magnum fuel injected truck that I never checked the numbers on maybe 308's a performer intake with some open spacers on top and a 800 holly the cam is a racer brown I forget some ware in the 510 lift range it runs 13.0 at 103 in a 3600lb 69 dart with a 4 speed over drive and 4:10 gears at who knows how old of slicks it will go 12.2 at 114 with 125 shot but I can't get myself to power shift it on the juice

i got a stock 360 in a 3300 duster with 904 12.39@105 430 gears

73 Ply Sat 4,300 racing weight. 360 E-58 2.02 valves no heavy porting 4.30 gears LD340 Comp single pattern cam 268 headers 750dbl pumper Holley and Point ignition or pertronix depending on weather 14.30 qtr. tons of timing for the 7.5 engine. Nice to be able to run home from track on regular.

i take that bet i got proof so let me know

I'll start by saying I saw a duster run very high 12's and the guy told me it was a stock low compresion (8:1) long block with a 509 MP cam and 4.10 gears. I think it had open headers.

Thanks

---

What color might this duster be? Yellow by chance?

green

Not yours Bad Fish,

I was asking Rapid340 and where did he see this Duster run.

I was actually wondering if it was mine or member 360/904's. Our's are a bit quicker than high 12.'s though.

Rick...

Quote:

---

I was actually wondering if it was mine or member 360/904's. Our's are a bit quicker than high 12.'s though.

---

Dont know if it was you, it was 10-12 years ago. Back before strokers and aftermarket heads where growing on trees.

It occoured to me that the first MP 300HP crate motor was a stock smog motor with a 280 474 cam and a dual plane intake. They had the swirl heads and I think those could touch 12's in a 3000 lb car.

A couple of magazines did tests with one of the 360/360hp Commando crate engines in a 3,400lb Duster. I believe Hot Rod had a shootout between that and Chevy & Ford crate engines. I think the Mopar ran low 12's in the shootout and Dick Landy got it into the high 11's afterwards with some more tuning. But that, like other crate engines, was not OEM available thus not a "smogger".

The 300hp version can't be considered a "smogger" for the same reasons. The only difference between the two was the intake manifold, .010" of cam lift and intake valve size.

I have the 300hp version, but blueprinted to IHRA specs with a single plane intake, I've been 11.31 so far. My engine builder has been high 10's in a lighter car.

But "stock smogger 360" can be defined a lot of ways. OEM looses a lot of compression because pistons were way down in the hole and car versions were dished. With or without smog equipment installed? Later years got worse.

To me, Smogger means stock pistons, stock crank and stock rods. Heads may be milled some as a cheap way to gain SOME compression back but over 9:1 and it ain't a smogger!

Quote:

---

The 300hp version can't be considered a "smogger" for the same reasons. The only difference between the two was the intake manifold, .010" of cam lift and intake valve size.

---

Myron,

I would be surprised if the old 300 crate motor was anything other than a stock low compression 360 long block with better valve springs and cam. I looked at some old MP catalogs and they specify the crate 360 as having 9:1 compression, the crate 300 they are strangely silent on compression. I bet all the 300 crates had production 8:1 cast pistons.

Jeff,

From some stories I heard, some of the original pre-production crate engines may have been built with OEM pistons, flattops or dished. But once production began both versions had higher compression flattops with notches.

I see what you're saying in the '93 and '94 catalogs. But the .474" cam would seem a little stout for an 8.0-1 compression. I have some more articles around but don't have time to do more digging. However, the IHRA specs for my 300hp version, which came from Mopar before they accepted the combo, calls for flattops with notches.

I just found that the 1998 catalog, page 25, lists KB flattops as "Service Pistons for the MP 360 Commando Crate Motors, 9.0:1." It doesn't differentiate between the 300hp or 360hp versions. Perhaps they were early KB 107's. The notches are not like the 2 "eyebrow" current versions, but they would likely provide about 9.0:1 if the heads and/or block were not milled a lot, just cleaned up.

P5249478 - 4.020"
P5249470 - 4.030"

I've been told that both versions of the original Magnum crates had OEM shortblocks.

my 360 is close to stock and ran a best of 11.51. stock short block from mopar cast everything. the one main help is it does have unported eddys, .567 cam and 4.30s 10to1 3300 w/driver