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Discussion Starter #1
454, .30 = 460ci
forged pop up pistons. final comp ratio is about 11:1
781 large port oval heades, ported & polished, larger vavles
roller rockers 1.7
cam is "magnum comp cam" 305* .575 lift 3000-6800 rpms
holly dominator singal plan intake, with preadator carb, 930cfm
msd,
what do you think this would run in a 70 chevelle 3800 pounds, 3.26 posi. 29x10.5 slicks built th 400 , manual valve body with 2500 stall ..pump gas ,
if need more info just ask..
 

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turbo lag......yeeeeehaaaaaaw
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IMO, 11:1 is too much for pump gas. I would not go more than 10:1 and even that would be pussing it as 10:1 takes a 30cc dome already. Also with that cam I would run 4:11 or higher with a 3500 or higher stall.
 

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Discussion Starter #5
i plan on putting higher gears 3.73 with a built 700 r 4, but keeping a 2500 stall or maybe 3000 stall i still want to drive it on the street friday nights, the pistions are 10:5 to 1 pop ups at the last minute they put on smaller heads and that raised the c/r.. they are all smoothed out and polished along with the heads so i have no detnation problems.
 

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http://teamrfc.gospelcom.net
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I have a friend with a similar motor.

468
9.5:1
victor jr port matched to heads
781 heads with clean up port work and 2.19 1.88 valves
850 holly carb
242 248 @.050 ~.600 lift cam

made 560/560 on using 20w50 oil.
I would think yours should make at least that.

As far as the 1/4 mile goes, it is a little hard to quantify all the low end torque. usually the online 1/4 mile calculators are fairly accurate, but I have found that they sometimes provide a pretty conservative estimate with these kinds of motors. By the way, I would be a little concerned about he compression also. Have you already run the motor? If so, how does it do on pump gas?

Also, here is an excerpt from a guy who owns a shop called Advanced Performance

"last weekend, was the last outing for our closest track here in minnesota. A friend/customer of mine, has a 69 Chevelle, it has a budget 496. Speed-Pro hypers, stock rods, cast steel scat crank, external balance, and some mildy ported 049's. They are fully ported, but not maxed or anything like that. A cam very similiar to yours, 2 inch headers, an 850 quick fuel, on an Air gap Perf. rpm. Tci street fighter 10 inch 3500 roughly stall, 3890lbs with him in it, thru full all the way out the back 3 inch ex, on drag radials, it went 11.23 at 118 and change. That motor was never dynoed, but has to be making 575 hp, and 600 ft/lbs. Another guy, we were with, has a 69 nova, 3450 or so, with him, 461, same basic heads, just bowl work, and good valves/valve job and same cam basicaly, Victor Jr, and an 850, same converter, that motor made 545hp, and that car ran 11.20's also, and he went 119 and change, thru the ex, on Drag radials. Both of those cars easily could run 10's, with no ex, and slicks. So, I would say, your deal would run similiar to either of those 2 cars, as long as everything works right"

Frank
Advanced performance
www.get-ap.com

I found that very helpful, I am building a pump gas 049 headed 496 for a 1972 ventura. my cam is a solid flat tappet 248 254 @.050 .600 lift.

Adam
 

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Discussion Starter #7
i have had run 93 octane with no problem, like i said everything is smooth out , no sharp edges. i did run lower octane once, complelty forgot , it detnated pretty bad, but runs fine on 93 oct..
thanks for those times by your other friends, i figure i should be pretty close to those.
 
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