265 afr headed 496 - Chevelle Tech
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post #1 of 30 (permalink) Old Feb 22nd, 20, 8:59 PM Thread Starter
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MARK
 
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265 afr headed 496

A while back I machined and built this 496:

4.310 X 4.250
Worked AFR 265 head
Performer RPM air gap intake
1000 CFM AED 4150 carb 1 inch open spacer
Mahle piston 10.5 compression
248/258/608/630/110 HYD roller
Scat 4340 crank
Scat 6.385 IRC rods
Modified Moroso 20401 oil pan
M77 oil pump
10/40 Maxima conventional oil, Wix 51061 filter
MSD 85551 dist
Tested on 91 octane 7-11 gas
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post #2 of 30 (permalink) Old Feb 22nd, 20, 10:04 PM
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Quote:
Originally Posted by VORTECPRO View Post
A while back I machined and built this 496:

4.310 X 4.250
Worked AFR 265 head
Performer RPM air gap intake
1000 CFM AED 4150 carb 1 inch open spacer
Mahle piston 10.5 compression
248/258/608/630/110 HYD roller
Scat 4340 crank
Scat 6.385 IRC rods
Modified Moroso 20401 oil pan
M77 oil pump
10/40 Maxima conventional oil, Wix 51061 filter
MSD 85551 dist
Tested on 91 octane 7-11 gas
Very nice. Are you surprised it didn’t peak much higher than your 238/248 cammed engine?

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Best ET w/N2O 11.47 @ 117
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post #3 of 30 (permalink) Old Feb 22nd, 20, 11:01 PM Thread Starter
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Re: 265 afr headed 496

No, thats typically where that combination peaks.
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post #4 of 30 (permalink) Old Feb 23rd, 20, 1:21 AM
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Mike
 
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Re: 265 afr headed 496

Good number, and a nice pan.
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post #5 of 30 (permalink) Old Feb 23rd, 20, 1:30 AM
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Re: 265 afr headed 496

Crazy torque for that bad boy.
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post #6 of 30 (permalink) Old Feb 23rd, 20, 4:44 AM
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Re: 265 afr headed 496

Awesome results Sir. I would love to know what the torque curve was like at the lower RPM range. It looks like the torque may have already peaked before the 4500 RPM pull?
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post #7 of 30 (permalink) Old Feb 23rd, 20, 5:08 AM
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Re: 265 afr headed 496

Mark,
Nice work.
Nelson
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post #8 of 30 (permalink) Old Feb 23rd, 20, 5:52 AM
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Re: 265 afr headed 496

Nice build and great nr’s.

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post #9 of 30 (permalink) Old Feb 23rd, 20, 7:19 AM
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Re: 265 afr headed 496

Quote:
Originally Posted by VORTECPRO View Post
No, thats typically where that combination peaks.
My bad, Allan's original was 669 @ 5800. For some reason I was thinking it was over 6000K as well.

Where did this build taper off, doesn't look like it's shown in the readout?
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1981 Malibu wagon
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Best ET NA 12.20 @ 110
Best ET w/N2O 11.47 @ 117
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post #10 of 30 (permalink) Old Feb 23rd, 20, 8:43 AM
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Re: 265 afr headed 496

Mark how much work did the heads receive? And again, what would a single plane intake offer here, if anything? Thanks

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post #11 of 30 (permalink) Old Feb 23rd, 20, 9:03 AM
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Re: 265 afr headed 496

Com'on Mark, where that's 700 ft lbs!? Don't be slackin' on us buddy!

For sure Mike & Mike, the oil psi is dead steady at rpm, and HP is still climbing at 6300! That's a BIG HR cam ! ( to me we're at the place where I'd prefer a lighter solid lifter to get to those fat .200" duration numbers asap, says the ol' horsepower junkie and non-pro customer engine builder)

perfect rod/piston combo for this app. Mahle's make good power.

Hitting 685 ft lbs on the clutch drop is a dream!

OUTSTANDING!

PS: for the record, when Mark asked me what my "goals" were with his new bullet, the first one on my mind was " 600 ft lbs please!" So, I'm all about the lbs ft Old Red sees anymore ( well with his old OEM bones - 600 @ a 4" arm is perfect!!)

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post #12 of 30 (permalink) Old Feb 23rd, 20, 9:37 AM
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Re: 265 afr headed 496

Interesting build, my engine is currently at Marks waiting to be built.
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post #13 of 30 (permalink) Old Feb 23rd, 20, 12:28 PM
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Mark would 700+ hp be doable with those heads bolted on a 396+.060 & 13.1 compression? 7500 rpm max approx.

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post #14 of 30 (permalink) Old Feb 23rd, 20, 6:11 PM Thread Starter
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Re: 265 afr headed 496

Quote:
Originally Posted by 1968 hot rod View Post
Mark would 700+ hp be doable with those heads bolted on a 396+.060 & 13.1 compression? 7500 rpm max approx.

I think the chamber is to wide, I'd work over a production head for that combination.
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post #15 of 30 (permalink) Old Feb 23rd, 20, 6:11 PM Thread Starter
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Re: 265 afr headed 496

Quote:
Originally Posted by rjt427 View Post
Interesting build, my engine is currently at Marks waiting to be built.
Yes please call me Monday.

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