Hot Rod Magazine 289/302's/327/350's and 351's dyno test? - Chevelle Tech
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post #1 of 31 (permalink) Old Jan 5th, 10, 7:58 AM Thread Starter
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Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

Maybe I missed a thread....but did anyone notice the dyno sessions in Hot Rod in the Jan 2010 issue?

They tested a Shelby version 289, an L76 327/365HP, a DZ302, a Boss 302, 351 Cobra Jet, LT-1 350 (11.0 version), a Boss 351 and an LT-1 350 (9.0 version) on the dyno.

They used headers for all tests as well as a 750 HP Holley carb. Otherwise the builds were with repro cams, no porting etc etc.

I thought it was pretty interesting to see how they stacked up and there were a few surprises...namely the Fords with the *huge/too big* intake ports and terrible exhaust ports.

289/306 HP- 302HP@5800/310 lb ft@ 4600- 228* solid cam

327/365 HP- 356HP@6100/369 lb ft@ 4100- 254* solid cam

DZ302/290 HP- 356HP@6700/333 lb ft@4400- 254* solid cam

Boss 302/290 HP-372HP@6800/325 lb ft@4200-228* solid cam

351 Cobra Jet/300HP- 365HP@5800/379 lb ft@3800-207* hyd cam

350 LT1/370 HP-353HP@5600/392 lb ft@4100 242* solid cam

Boss 351/330HP-383HP@6100/391 lb ft@4000 228* solid cam

350 LT1/330HP-359HP@5900/376 lb ft@4100 242* solid cam


Might be some fun reading to look at how compression, cams and heads conspire to make a total engine *package*.

JIM

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post #2 of 31 (permalink) Old Jan 5th, 10, 8:19 AM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

Need to read that in entirety. Will tell you, I always liked the 351 Cleveland motors.
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post #3 of 31 (permalink) Old Jan 5th, 10, 10:35 AM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

The 327/DZ302 really impressed me, that's alot of juice for 40 year old engines designs. The Boss 302 is real impressive considering the size of the cam.

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post #4 of 31 (permalink) Old Jan 5th, 10, 10:54 AM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

It's funny that the Fords had smaller cams yet made considerably more power. HMMM.

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post #5 of 31 (permalink) Old Jan 5th, 10, 11:15 AM Thread Starter
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

There were a few literary issues and some picture flops. Hard to tell on heads in all cases, but hoping they are somewhat correct and no *ringer* cams are in there. But either way it's fun to see because getting that many engines on the same dyno is a LOT of work!

JIM

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New: 1140 RWHP ET?

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post #6 of 31 (permalink) Old Jan 5th, 10, 11:23 AM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

Keep in mind - the BOSS motors, especially the 302 was "dead" till above 4000 RPM. Ports in those heads are about the same size as a regular BBC oval port.
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post #7 of 31 (permalink) Old Jan 5th, 10, 11:56 AM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

I read this also. It's fun to see what did what in those eras. What kind of surprised me was the said output hp/tq vs the actual hp/tq. I believe they all exceeded what they were said to do.
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post #8 of 31 (permalink) Old Jan 5th, 10, 12:08 PM
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Cool Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

I thought it was a cool article. Made for good reading while sitting on the throne.

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post #9 of 31 (permalink) Old Jan 5th, 10, 1:39 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

What the heck, Jim, why are you checking out these little weenie engines? Need a new starter motor for that honker big block of yours ???

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post #10 of 31 (permalink) Old Jan 5th, 10, 2:51 PM Thread Starter
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

I was eyeballing those Boss 351 ports and thinking.....it's not that the ports are too big.....there just isn't enough motor under them!!

Or CAM!!

Don't believe everything you've read about the Boss 302's and 351's. I've driven them and can guarantee you they are at least as *lively* as a DZ302 under 4000 rpm...which isn't saying a whole lot. No biggee....if you're rolling along at 30 mph...you just push in the clutch....rev it to 5000....and BAM!!!...dump the clutch...INSTANT POWER!!.

Of course that also works on 327's 350's, 427's.....540's........


There was a white Boss 351 Mustang in Houston years ago that cleaned house on the street!


JIM

'67 Vette-555"/Gforce 5 Spd/Dana 60 IRS-3.07's

9.90@141.40

New: 1140 RWHP ET?

http://s318.photobucket.com/albums/m...rrent=Jim3.mp4

http://s318.photobucket.com/albums/m...rrent=Jim4.mp4

"...when it's not pointing at a wall...grab a gear!"

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post #11 of 31 (permalink) Old Jan 5th, 10, 3:10 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

Interesting how the LT-1 9.0 outperformed the 11.0 in terms of of a few HP (+6) at a higer RPM but the 11.0 had more torque (+16). You would think that the 11.0 would've shined everywhere, but I guess 6hp might be withing the "fudge" factor?

I'm assuming here that the two engines were both the early 70's LT-1 and not 70s LT-1 versus 90's LT1

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post #12 of 31 (permalink) Old Jan 5th, 10, 3:38 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

Been a while since I built a small block. IIRC, Chevy saw similiar gains going from the 64CC bathtub chambers to the 76CC chambers as they did when they went from closed chambers to open with the big blocks. 2.02/1.60 valve combo were a snug fit in the early chambers.
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post #13 of 31 (permalink) Old Jan 5th, 10, 5:22 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

I sure hope they make a bigblock version of this article. That would be really interesting.
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post #14 of 31 (permalink) Old Jan 5th, 10, 5:51 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

A few observations, if I may:

HP is all about FLOW. Since it's the time rate of doing work, and "doing work" is just another way of saying "releasing energy", then it's obvious that HP is determined entirely by how much the induction system flows, if all else is equal. Which, if you follow that to its logical conclusion, means that if you took an induction system and put it on 2 different motors that were absolutely identical in all respects except for their CID, you should get the same HP, except at different RPMs; and, you should get peak torque in direct proportion to CID, except again at different RPMs. Look at the 302 vs 327 #s.... identical heads, cam, compression, exhaust, intake, only thing different is the CID. Look at the HP and torque numbers; do the arithmetic of 327/302 * the 302's torque, and look how close that comes to the 327's torque. They follow the above description to the point that it's scary. Same for the Boss 302 vs Boss 351. Not quite as close, but not too far off either.

The Cleveland 4-bbl heads are AWESOME. IMO some of the best V8 heads ever made. The exh port is HUUUUGGGEEEE; it's so big, a stock cast-iron BBC exh manifold will almost GO UP INTO it (OUTER DIMS of BBC exh man casting only very slightly larger than the Cleveland PORT). It's a real shame they put the stupid Cruise-O-Matic BH pattern on that block, so you can't bolt a C-6 to it; and that it has that stupid Frod valve train on it. That was onehelluva motor, otherwise. Oh... and of course, that it was a 351, in the days when the cut-off between "high performance" and "regular", for insurance purposes, was at 350. That was about a 35% hit to the premium, for that ONE inch. Thank you Frod.

Kind of amusing how the Boss 302, with Cleveland heads, put out 25% more HP than the 289, with Windsor heads. Really shows how much of an engine's performance lives in the HEADS.

Looks like in "stock" trim, the 487 head casting flows more than the 186.
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post #15 of 31 (permalink) Old Jan 5th, 10, 8:51 PM
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Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?

I gotta find this mag somewhere, like seeing comparos like this. I take it its not online yet?

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