Drooze & Teuton

[Tom Moock]

Hemidup, Drooze isn't entered in stock at Norwalk and they are full. Tom

[hemidup]

Originally Posted by Tom Moock

Hemidup, Drooze isn't entered in stock at Norwalk and they are full. Tom

Hi Tom, I really don't know what Drooze has up his sleeve and I didn't bother to ask. I can tell you he told me he missed the dead line for Norwalk, then drove 1600 miles round trip to pick up an engine block from me and told me he'll be at Norwalk.

[Jeff Lee]

Well...we just had this issue about rocker ratio's thoroughly discussed here.
And I still do not know what, f any, tolerance NHRA will allow. Does anyody? Is a 1.65 RR in the tolerance zone if 1.60 is in the books? Are these Hemi rockers somehow marked as delivered (like a crane rocker for example) or is it up to the racer to determine the actual ratio? And was 1 or all 16 out of spec?
Are modern Hemi's more exact in the RR or are they like engines of yesterday, all over the board and you must sort through 100 to get the 16 you need?
And I would bet my last dollar Teuton had the correct cam lift as measured at the valve.

[Alan Roehrich]

Jeff, the way I read Travis' reply was the tolerance is +0, -X, meaning you can be under by a reasonable amount, but not over by any amount.

Here is the thread you mentioned: http://classracer.com/classforum/showthread.php?t=25533

In that thread, Travis made it pretty clear that if the spec was 1.5:1, for example, that 1.50:1 was legal, and 1.51:1 was not.

Yes, it is up to the engine builder to determine the actual rocker ratio as the engine is being run, and the racer is responsible for it.

Engine builders are human, as are racers, and they make mistakes. Without naming anyone, it has not been that long that a very well known racer was DQ'd from a race for this very reason, and his engine builder is extremely well known as one of the very best in the business. Both parties involved are stand up individuals, and the size of the infraction would not have made any difference in power. All they did wrong was to not check for lift at every single rocker, so the tolerances stacked up and they got bit.

[hemidup]

Did Jeff run the Hemi package or the 5.9? These new Hemi's have a slidder rocker which could increase the rocker ratio with lift. Comp is the only company grinding cams with a1.60 ratio. Most others grind them with a 1.65 and Crane ground theirs at a 1.70.

[Jeff Teuton]

Just goes to show you, you are never too old to learn. We checked ok on everything, bore, stroke, cc on chamber, runners, throttle body, intake, cam lift, and everything else. The rocker arms are 1.65 and the spec says 1.60. Like I said the lift was ok. Consider this, how many rockers have anything written on them in Stock? We just discovered one pitfall of the new stuff. We actually had done everything for the record and were finished, the next morning after we made another run, we had to remove a valve cover and they looked again. So much for the weekend and the record. The cam checked and we honestly thought that was all it took. We were wrong. So we will get some 1.60 rockers and get a new cam.

[Rory McNeil]

Frankly, as long as the total lift at the retainer is at or below the max allowed, why would anybody care what the rocker ratio was? It seems that most factory rockers are well under the advertised ratio (My 5.0 Ford spec is 1.60, but most OE rockers are 1.53-1.54), so if we can have a cam made with more lobe lift to compensate for the crappy rockers, why wouldn`t the opposite be true?

[Chris "drooze" Wertman]

Originally Posted by Jeff Lee

Well...we just had this issue about rocker ratio's thoroughly discussed here.
And I still do not know what, f any, tolerance NHRA will allow. Does anyody? Is a 1.65 RR in the tolerance zone if 1.60 is in the books? Are these Hemi rockers somehow marked as delivered (like a crane rocker for example) or is it up to the racer to determine the actual ratio? And was 1 or all 16 out of spec?
Are modern Hemi's more exact in the RR or are they like engines of yesterday, all over the board and you must sort through 100 to get the 16 you need?
And I would bet my last dollar Teuton had the correct cam lift as measured at the valve.

Unless I missed something Jeff is running the 360 LA Combo...

Right now other than a $4000 Set 0f Jessel contraption there are no aftermarket rockers. Supposedly one is from someone but my brain is too tired the think of it, I think a steel would be killer, the powdered metal is too brittle if it gets scored. A nice set of forged would do the trick.

But Jeff has a 360 , unless like I said I am mistaken and they changed it.

[Myron Piatek]

Originally Posted by Chris "drooze" Wertman

Unless I missed something Jeff is running the 360 LA Combo...

Don't mean to be nit-picky, but to avoid confusion, the Challenger DP 360's are actually considered to be the "Magnum" version. I believe someone said the aluminum heads are re-cast Edelbrock Magnum heads with the Mopar logo. There should be at least a small variety of rockers for them.

A "LA" 360 typically refers to the original style which came with rocker shafts.The family includes 273, 318, 340 and 360. Excluded are what they call the "poly" 318 in the early-mid '60's and the later 318 amd 360's in the '90s that became the Magnum family.

.....You did say you were tired!

[Chris "drooze" Wertman]

Yep....whooped....and you are spot on.....

Derher.....

And I do know better......

But yer 100%.....

I like the Poly 318's always have.....

Originally Posted by Myron Piatek

Don't mean to be nit-picky, but to avoid confusion, the Challenger DP 360's are actually considered to be the "Magnum" version. I believe someone said the aluminum heads are re-cast Edelbrock Magnum heads with the Mopar logo. There should be at least a small variety of rockers for them.

A "LA" 360 typically refers to the original style which came with rocker shafts.The family includes 273, 318, 340 and 360. Excluded are what they call the "poly" 318 in the early-mid '60's and the later 318 amd 360's in the '90s that became the Magnum family.

.....You did say you were tired!