New 360 what time ?????

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A360

Benton
Joined
May 31, 2006
Messages
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Location
Perth, Western Australia
Howdy fellas
Sitting here at work pondering what my car will do this friday night at the track.

History ;I had some lifters stuff up which took out the cam and push rods so have rebuilt the engine on a extremly low budget

Specs

Valiant Hardtop (Dart)
360
727 -3000stall
9'' 3.9 gears
extractors into 2 x 2.5'' system
750 DP holley
M/T street slicks
engine has the following ,cannot change now as all built and been running for a week now in the car.

11.1 comp
Forgies
Adjustable rocker gear (273)
Torker 2 intake
Cam (only one I could get at no cost) Crane 560 lift / @ .50 x 258
heads Iron / 2.02 x 1.88 valves

Remember I do not have much room to move as far as cost goes basically the above is it.

basically Only change from the last engine in the rebuild is the cam.

Best run prior 12.7 @ 109mph


Thoughts on what times now?

cheers

Benton

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Sort agree with the 12.3ish area. I do have concerns with the stall matching up with the cam.
It will be a suck and see approach Fri night.

20081222-AM1A1976[1].jpg
 
I will bet your in the 12.3-12.4 range once you re-jet your carb for the new combo. Sounds like it's going to be a blast.8)

Lol! We posted at the same time.
 
I kinda agree with you on the mismatch between the cam/converter but it should have enough power to make up once it's out of the hole and hooked good, who knows a really little bit of tire spin might help you, drag racing's weird like that. Good luck, have fun, it's 22 degrees outside right now so I'm jealous of the fact that you can even consider taking your car out lol
 
Had a frustrating night run a bunch of 13.7's at 100mph.
Which of course is way off the money.
Fellas filming seemed to think it was running fat and I thought that it wasnt getting enough running a bit lean.

Changed jets from 73 / 81
to 77 / 81
then 80 / 81

60' were all around 2.0

only made a tiny diff and in fact when I went to the 80's I went slower.

I only have a 30cc pump at this stage have a 50 planned but don't think that would make a second diff

It reved right through without out an issue but just was slow.


going ponder this one.

Benton
 
Are the heads stock? If so you might have been better sticking with the cam you had cause if the heads don't flow a bigger cam will only loose power badly down low and won't make much more up top.
 
Work on the chassis, that's where most of your issues are currently. 2.0 60' foots, that's 13-14 second car range. It should be in the high 1.60's, low 1.70's

The MPH is in the low 12 range.
 
As said above, your 60' is killing you. You probably aren't pulling the same amount of vacuum with the different cam. I would get a vacuum reading on the new cam and change the pump shot accordingly.
Where are you shifting?
Did you read the plugs to see if you were lean on the top end?
Sound stupid but check your linkage and make sure your secondaries are opening all the way.
 
Valve size? 1.88 exhaust on a 360? With 1.60's and plenty of head work, you should be able to run that much cam but something is hurting your bottom end. Run it and check plugs for rich. Change jets to orginal and run and check plugs. Rich? Lean?
 
Thanks for all your comments

I will follow through on point by point basis to find the issue.

The cam is the major change so what affects/causes that will looked at first.

Cheers

Benton
 
Racing tonight at a test and tune.

First change wasto change the carby over to the same one I ran the 12.7 @ 109mph with.

Process of elimination ,one at a time.
 
Well, I eliminated the carby as an issue as I went slower 14.1 @ 96mph.

Motor is running fine on the street nice and strong.

Will put my 750DP back on.

Next in the process of elimination will be the dizzy

Trouble with one step at a time is that it takes time :-(

Benton
 
A360 said:
Howdy fellas
Specs

Valiant Hardtop (Dart)
360
727 -3000stall
9'' 3.9 gears
extractors into 2 x 2.5'' system
Click to expand...

What are extractors? Is that headers or stock manifolds?

I'm betting on the camshaft since that was what was last changed. Either that or valve lash, weak springs or the like.

Steve
 
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