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-   -   How fast? (https://www.racingjunk.com/forums/showthread.php?t=26847)

Pwmax 01-01-2010 02:45 PM

It could run low 11's, maybe even 10's. Obviously a lot of factors will contribute to that though. 3890lb 69 Chevelle, 496, 9.7:1, mildly ported 781's, 240ish, .580 lift solid cam, Perf. RPM air gap, Quick fuel 850, 10 inch converter, 3.55 gears, drag radials theu 3 inch ex, all the way out the back, runs 11.20's at 122.

Frank

whitey70ss 01-02-2010 12:25 PM

Thanks Frank that gives me some hope! I'll be happy for a while with mid 11's .

whitey70ss 08-02-2010 02:56 PM


Originally Posted by gungho
Yes I concur,but I was saying at best,with good weather and all dialed,but more like a mid twelve to start with.that would be just my guess,of course there are a lot of variables,I would go with the biggest cam the heads will allow if I were running a four speed.

Figured I would give you guys a update. First run off the trailer , left at a idle and ran a 11.96 at 119. Track got shut down. Went back the next weekend , the weather was in the mid 90's very high humidity. First run was 11.66 at 119mph. I just switched from 26 in slick to 28's and havent got to run the car yet. Thanks for all the help throughout my build.

Scooterz 08-02-2010 03:31 PM

Good to see there is harmony in the RJ crib again. I don't know anything about those heads, so I kept my mouth shut. Besides, I have "Corvette" heads... don't need anything else.

Pwmax 08-03-2010 04:28 AM

Sounds like in good fall air on a good track, it will go low 11's easily. Mid 90's and super humid, obviously is no good for good et's. 119mph, will turn into 122-123, maybe a bit faster with tuning. With that mph, you could hit a high 10 even, if you got the car to launch good.

For the record, we have built 2 496's this year, with those heads. Both sets were ported, one set a bit more than the other, but not what I would call radical porting. One was a hyd roller deal, made 700hp and 630tq on pump gas. The other was a solid roller deal, on pump gas, made 740hp and 650tq. Neither engine was set on kill.

Frank

ballsout1 08-07-2010 04:17 PM

i had a 72 chevelle 468 all steel with flat top pistons closed chamber heads, similer cam, 4.88`s pump gaS motor.... ran 11,2`s all day....7.3`s eigth mile.

whitey70ss 08-08-2010 06:02 AM

Yep I'm happy with it . Very nice to drive on the street (good manners). I think it has a lot more in it with some good air. Thanks alot guys.

cepx111 08-09-2010 09:37 PM

Going from a 26 tall tire to a 28 incher its gonna kill some ET so expect that.

You can compensate for that and pick some ET by Footbraking/stalling the car up as high as you can without pushing thru the lights.

JMO>Cp


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