timing order swap

[Dave Severson]

Wondering who here has tried the new cams with the 4 & 7 cylinders swap in the firing order and how it worked out??????

[Geronimo]

I hear it improves torque and smoothness. But need new plug wires

[jerry clayton]

We have used it on hundreds over the past few years---makes a chevy sound like a ford--torque is much improved--really helps on dirt late models

[Dave Severson]

Thanks Jerry.... Just considering some options on the big block for the 'maro..... with a 3000 pound car, I'll take all the torque I can get!!!! I'm sure somebody has a good hydraulic roller cam out with some decent numbers for it.... Not sure if I will go 496 or 540 cubes..... What do you think, is this old Ford guy on the right track trying to put a chebbie together??????

[pat mccarthy]

yes i have

[techinspector1]

I don't know Dave, there's just something about sayin' five-forty that makes it sound better than sayin' four-ninety-six

[billlsbird]

....Dave that's what I had/have in my '32. I say have had cuz the motor blew up, in fact to be more specific; the CAM broke in half!!! Yep, that's one reason I'm going with the Hemi, cuz my motor blew. Of course being a 4/7 had nothing to do with it breaking. This motor with the 4/7 cam put out 20 HP more than my other cam {same Tq.} but then I also had the compression raised, the carb redone & switched to a Air Gap intake manifold....
Although I long ago lost the dyno sheet from when I had the regular cam & I don't know if this really helps you or not but here is what my torque & HP was with the 413 Chev small block, AFR 195 heads, Comp cams # CS 47S XE274H-10, 230/236 Dur, Lift .487/.490 but I used 1.6 rockers {.519/.522}, air cap manifold w/ 750 dbl pumper reworked by the Carb Shop, 1" spacer, Sanderson outside headers 1 3/4", 10:1 compression, MSD ignition;

RPM Tq. Hp.
3600 465 319
3700 470 331
3800 484 350
3900 487 362
4000 493 375
4100 495 386
4200 496 397
4300 498 408
4400 498 417
4500 497 426
4600 495 433
4700 486 435
4800 482 440
4900 471 440
5000 469 447
5100 465 451
5200 460 455
5300 453 457
5400 444 457
5500 431 452

[Dave Severson]

Looks like some good numbers Bill. Been doing some studying on them, seems to give some torque increase....

You're right Richard, 540 does have a nice sound to it.........

[jerry clayton]

Dave----I have some sayings I use quite often

I'm just an Illinois farm boy
Tractor motors need straight round holes
I'm just an old drag racer
Dragster engines need straight round holes
I'm just an old jet pilot who used to drag race

The crankshaft doesn't know what the valve cover says
(so don't worry about the chevy/ford thing)

New one -----187 beats 184

Got it????

I once built 3 identical short blocks for me and two of my friends---the boring bar slipped on mine and I had to go bigger to save it---My 522 always outran there 496s---and I just happened to have a set of pistons when one of them hurt there their 496

Jerry

[Dave Severson]

The boring bar slipped??? Geez I hate it when that happens...... I'm just an old farm boy from South Dakota, so I know where your at on that!!!!

[pat mccarthy]

well i know of some 396 bbc that got real bighey i do not know any thing never tell a guy with a boring bar that you have a bigger engine yep not for long nothing better then the sound of my rottler cutting out a block a bit bigger

[jerry clayton]

yep and sometimes it takes an 1/8 inch just to get it to barely clean up

[pat mccarthy]

Dave----I have some sayings I use quite often

I'm just an Illinois farm boy
Tractor motors need straight round holes
I'm just an old drag racer
Dragster engines need straight round holes
I'm just an old jet pilot who used to drag race

The crankshaft doesn't know what the valve cover says
(so don't worry about the chevy/ford thing)

New one -----187 beats 184

Got it????

I once built 3 identical short blocks for me and two of my friends---the boring bar slipped on mine and I had to go bigger to save it---My 522 always outran there 496s---and I just happened to have a set of pistons when one of them hurt there their 496

Jerry

hey jerry did you do a 4.375 bore thats 511 or did you go to the old cam am bore 4.440 ? that is abit ...less you had a bowtie block

[pat mccarthy]

yep and sometimes it takes an 1/8 inch just to get it to barely clean up

my set up mic only will work on 4.310 and 4.600+ no dave 540 is ok but 555/565 sounds better and even better is 582 or i can sell you my 632 donovan flat top engine can you say pump gas engine

[jerry clayton]

We had 3 of the first 7 of the bow tie blocks--they couldn't use them in NHRA yet and weren't big enough for IHRA but for us racers in the UDRA we could use them--think they only cost about $800 and we used stock 4 inch bbc crank, the 522 was 4.560
Stock C port heads, 5/16 valves, some clean up work, dry sump, dual dominators---some of the first cars to run 7s, I think my Monza was first to qualify with a 7, make all runs in 7s, and win race ( Milan, Mi, 1984)there was some sporatic 7s prior to that, but that was most memorable race---people there were Leroy Roeder (he had just bought Musi's car& was #1 qual we were #5) Jim Furer's Mercury shotgun, Bruce Allen with a R&M car( prior to driving for them)another shotgun car from Minnesota( can't remember his name ) ---all the cars we ran turned in the 7s on the run---it was a series of the quickest side by side PS runs at that time