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Were you planning on mapping the flow as it exits the valve from the chamber side like you’ve done before? Be interesting to see if the dead areas changed at all.

Alan Prusiensky, ARC Race Engines, Rockaway NJ https://m.facebook.com/ArcRaceEngines/

Mancini sells an equivalent cam to that one. Comp does as well.

Something along the lines of a Howard’s 723515-12 would meet your requirements. The availability question could come down to whether or not they have a core(a blank) small enough to facilitate that grind. Edit- actually……they’re in stock at summit.

What’s worked reasonably well for me is- With the caveats that how good the “car” is(which is everything except the engine), is a huge factor……… If the dyno numbers are legit, and you’re racing at tracks that aren’t at high elevations(call it less than about 1000ft), in “reasonable” air...

It’s not a “little” different. If its a hemi cam, the lobe arrangement difference is obvious.

The difference between a wedge cam and hemi cam is the lobe positioning for 1/2 the lobes. If you lay a wedge and hemi cam next to each other and have it so the dowel pins are both in the same position(like at 12 o’clock), then look at the direction the lobes are pointing, they will be...

I didn’t put it together that there were 2 runs displayed(duh). I was looking at the 2.24 I think you should be solidly in the 12’s now.

The speed is enough to put you well into the 12’s. 60’ needs a bit of work though.

Do Magnum heads fit a 400 block?:poke:

OP Mancini cover, Allstar cover look like the same thing:

I wonder what Blueprint Engines is using for covers/pans for their crate engines?

Is that area of the cover different for a Magnum, and/or that piece of the pan gasket for a Magnum?

...on a build like that? The one set of cnc’d SBM SM’s I had here had a valve job I didn’t love. Cnc’d pretty much right to the 45, and then a 0* top angle. Looking at the flow numbers in the SBM head thread it appears the prepped/blended unported version out flowed the cnc’d/as from SM...

Pretty substantial difference …….. especially at that power level. If you built the SM combo, what are you going to buy with the $700 you saved to get back the missing 40tq/30hp? I agree it would be interesting to see how a set of “prepped/blended” SM’s would stack up.

If the stroke is now 3.54”, then they added .160” stroke. If the pistons are 1.485” C/H, and the rod is 6.70”, the pistons should be down the hole .025”(in an uncut block) 1.770”(half stroke) 1.485” 6.70” ———— 9.955” .025” deck ———— 9.980”

Frankly, I can’t believe this is a question. It’s an easy thing to correct for zero dollars spent. Why wouldn’t you want it right?

Cams for 318's 15 pages of answers

Published specs for the PAC 1903: [email protected] [email protected] 391lbs/in rate This is the same spring as the TFS-16893

Need to know what heads are being used, and the available installed height.

At $2800 + parts and shipping……….. in 2013 dollars……. I wonder how many takers there were for that?

All your Speedmaster “needs” are still only a phone call……..or click……away. Just not Summit or Jegs phone numbers………for the time being.

When your just a bystander, you can’t really complain if someone else’s dyno testing doesn’t follow the priorities you’d have if it was your test. That being said, “if it were me”……. And I was going to orchestrate a SBM head shootout test……..I’d want to use a short block and induction/exhaust...

Are you familiar with the dyno service he uses? Looks like a nice enough set up.

Looking at the builders YouTube channel………it appears he’s no stranger to the street, street/strip SBM Mopar builds.

I agree with RAMM in that I’d be way more concerned with differences related to testing procedures and weather variables than whatever small power differences are the results of the slight change to the short block configuration. I agree, and feel like I’d be able to extrapolate some useful...

Tough crowd.

The age old question……. What’s the difference in power between manifolds and headers. And the age old answer is…….. “it depends”. I look at it this way……. In terms of the typical ohv v8……The more hp/ci your build makes with headers…….. the higher the % of loss you’ll see with manifolds. 20 or...

I’m sure for the guys that run a lot of 1/8 mile, they might have a good handle on what’s a decent slip value for 660’. Most combos will have way way more slip at 660’ compared to the full 1320’. Myself, I have no useful data for converter slip at the 660’.