Quote:

---

I ran the 690 mushroom in a 383 YEARS ago, it made
real good power and it wanted to run high rpm

---

Yeah, I'll bet! Our nostalgia rail with ported "915s", a Lunati 316/326-265/271@.050"-.576/.563"-108LSA solid flat-tappet, Offy TR w/2X660s on a .060" over 383 (394") 13:1 compression wanted 7200rpm every shift! With 1000gr+ pistons and beamed stock rods with WaveLoc bolts I was praying every pass!!!
I hope the stroker nature of this build will tame that some, most of these were ground with Super Gas/ Super Stock type RB motors in mind (426-440) so I'll bet the bigger motor will love the fat lobes and the aluminum head's better flowing ports can surely use the over .600" lift... I think that STX-60 would be the BOMB with maxed-out iron heads on a serioud 383/400 though... RB

Quote:

---

I've ran three different racer brown mushroom cams. One stx22 and two differnt stx42's with different lsa's I would like to try an stx 62 just for fun to see what it would do. As far as the spot face on the lifter bores go all I had to do to my old 440 block was clean up the casting at the bottom of the bores. My lifters are not the stock steel lifters and have a huge radius from the 1 inch face transitioning into the body so I had to make a chamfer at the bottom of the lifter bores to make them work? The only reason I had to do this was to get the lifters down in the bores so I could install the cam. Once the cam is installed the lifters never come close to that area of the block. My new world alumium block came with bushings that hung down so far we had to back spot face them flush with the boss and then make a chamfer. The best pass my car has made was in 07 when it ran a 9.62@ 138mph with a 60' of 1.28 The car then weighed 3170lbs had 496ci and I was running mufflers that always killed a tenth.

---

The STX-60 seems mild, I guess it has the velocity/rate-of-lift going for it, but not so much @.050" duration for a big block. Of course that 105LSA is gonna make it rattle! Sounds like you had a big enuff motor for the STX-62, and by the way, I have always wondered if Racer Brown supplied this cam to MoPar as their "MiniExpress" grind, or if they copied it, as their specs are almost identical. (?)
I have been told before that the 328 dur."690" MoPar grind (supposedly 10hp better than the .650" mushroom 328deg. predecessor) specs out almost identical to the McCandless/Comp 324-.650" regular .904" solid. The guy that told me this is reputable and runs the .650" McCandless cam now, but he said the "690" was only .650" lift with 1.5 rockers. I put mine in a block and measured the lobe lift directly from the lobe and got .458" on both intake and exhaust lobes for #1 cylinder. That would be .458"x1.5=.687" (.690!), so maybe he mapped the older 328/.650, IDK.(???)
Thanks for your input! RB

Quote:

---

The stx 42's have more duration @.050 (290) than the stx 62 (280) but the 42's have less lift 673 with 1.6 rockers. The stx 62 has 687 lift with 1.6 rockers. My first stx 42 had a lsa of 108 and my current one has a lsa of 110 don't sound like much but it gained me piston to valve clearance and also mellowed out the idle.

---

OK, I see, the STX-42 wasn't on the RacerBrown sheet I have. The 62 sounds similar to the "MiniExpress" that I have (314deg x.654" MoPar), but mine is on a 107deg LSA according to (erratic) MoPar. What did the 108LSA STX-42 idle at, 1200rpm??? What did you run for valvespring? I have some in mind... RB

Quote:

---

Mopar peformance 316 duration, 107 center line valve lift 654 intake and exhaust, made 640 hp in my old 440 stock stroke 906 home ported heads back in the 90s. The mini express has 328 duration and 690 lift and works better in light weight cars. I really like mushroom lifters cams and I am working on a new motor which is a small block 408 and Im going to use a mushroom cam that I found in this forum. Good luck with your project. The power is really close to a roller cam without the expensives and the maintenance.
If you want to sell your mini express send me a message.

---

That was a rockin' 440 you had with 640hp and no roller cam!!!
I hate the way MoPar Performance mis-labels and cross-markets their stuff over the years. The same "MiniExpress" part number and description seems to have applied to at least three cams!!! Their own "bible" lists the LSA as 106-107deg !!! I have read in numerous magazines and book-compilations of mags where the same part number (ends in "588" IIRC) is described and listed as BOTH .654 and .690" lift and 314 AND 328 duration! Then in my latest "bible", in the text, not the charts, they say:"the new camshaft provides a 10hp increase at higher rpms than the .650" version of the 328 it replaces. This is not an easy task at this level, low end torque is reduced somewhat, a race torque converter must be used. Requires mushroom tappets, sold seperately..."
The .654" camshaft I have is a "MiniExpress", listed in the charts in the SAME bible!!! I doubted the .650" cam existed but I have seen them in independent publications and for sale on Ebay, where I got my 328/.690" that has a different part number and came WITH lifters. I think MoPar just threw the "Mini-Exp" name around referring to whatever they were selling at the moment. They are obviously from different manufacturers, as the 314/.654 is parkerized and has the grooved 4th journal like the STX-60 and the 328/.690 (confirmed by ME to be .687" lift w/1.5 rockers) is polished (non-parkerized) like all the other PurpleShafts were in that era (and still today I guess). I know it's alot of blabbing , but it is very confusing and hard to even get a recommendation because everyone thinks they have run a certain cam, but WHICH ONE WAS IT!!! If I decide to liquidate one, I'll let you know, you might want to send me a PM so I'll have an easier way to find you then. Thanks, RB

PS: I saw a MP mushroom LA cam "MaxVelocitor" or something to that effect on Ebay a while back. .670" lift, 110LSA, IIRC, is that the one you have? Just curious...

Quote:

---

A couple of comments from my experience of many years ago-----

We used both the Mopar .654" and .690" mushroom lifter cams. Neither required spot facing the underside of the lifter bores---you might want to check that before doing the machine work. Our experience was in 400" blocks only, the 383" may require it, I don't know.

Both Mopar cams worked good, but required serious head work---worked semi stock heads will not benefit from the the .654" or .690" cams.
The heads stall at a much lower lift. The engines did need to turn some RPM to work well----around 7800RPM.

BTW, Lunati also produced mushroom cams for the BB---and they worked really well with less lift and slightly more duration.

Another thing, don't get too crazy on valve spring pressures----180 on the seat and 400 across the nose works OK. And, loosen the lash .02-.03" to allow for more lifter rotation.

Check your rocker geometry real close----make sure the rocker sweep across the valve tip is centered and as short a sweep as possible.

Finally, use inner springs to break in the cam/lifter.

---

WOW! Thanks for that info. I was thinking 150# on the seat but you say 180# is OK? I know the "battleship" spring was over 150#, so that makes sense. You say break-in with ONLY the INNERS or do you mean WITHOUT the inners, OR with both the inners AND outers? No excessive wear with 400#+ open? That sounds good. The heads I'll be running are similar to the Edelbrocks (which they are patterned after) and don't stall within the range I'm looking at, they're still climbing, albeit slowly, at .750", so I figured .650ish at the valve would be good. Hopefully the longer stroke and increased CID will help reduce the top rpm to 7,000 or less, especially with the smaller .654" unit.
Yeah Lunati makes some killer stuff that they don't market, like the MaxWedge StageIII cheater cam I have. 268/272*@.050" with .518" lift, 105LSA. The lobes are SQUARE looking and have awesome area-under-the-curve (valvespring KILLERS!), but really work mild IRON heads in a 440. I did not know they made mushrooms, though. What kind of specs or do you have any info on them? I had a REED cams catalog with maybe 2 dozen lobe profiles (.960 and 1.0" min-dia. profiles), but I think REED went belly-up like CraneCams RB

Quote:

---

The mushroom cam with a 654 lift and a 316 duration is a different cam from what Mopar calls the mini express with 690 lift and a 328 duration. I was using the small mushroom because my car wieghts 3700 lbs with my in it, It was a 68 charger that ran 10.50s. The mushroom cam that I found in this forum had 630 lift with 1.5 rockers and it will have 652 with the 1.6 that I have on my small block. the only marks on the cam are mv102

---

Not arguing, but my .654" says "MiniExpress" right on the BOX!!! It's weird! Maybe you're SB cam is a STX-60 like my BB one, or a knock-off of it. It's 271@.050 and .632" lift, so that would be close. good luck with it, regardless!!! RB

Quote:

---

Quote:

---

The stx 42's have more duration @.050 (290) than the stx 62 (280) but the 42's have less lift 673 with 1.6 rockers. The stx 62 has 687 lift with 1.6 rockers. My first stx 42 had a lsa of 108 and my current one has a lsa of 110 don't sound like much but it gained me piston to valve clearance and also mellowed out the idle.

---

OK, I see, the STX-42 wasn't on the RacerBrown sheet I have. The 62 sounds similar to the "MiniExpress" that I have (314deg x.654" MoPar), but mine is on a 107deg LSA according to (erratic) MoPar. What did the 108LSA STX-42 idle at, 1200rpm??? What did you run for valvespring? I have some in mind... RB

---

Idled best around 1500 And for valve springs? I'm running an all composite mushroom lifter that was made by schubeck thus the huge radius at the bottom. My springs are a comp spring p/n 932 with an installed height of 2inchs it gives me 200lbs seat and 510 over the nose. SM will make a set of mushroom lifters and from what I hear he will make them with either a composite face or all composite but then there is that cost issue.