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- 10:09 PM
- Jan 18, 2018
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I’m not a tranny expert, but that does not sound right to me.Y
Yea, I put the stock governor back in. No problems now.
I've rebuilt a few. The 1-2 is controlled by a spring in the valve body. I haven't tried swapping springs.I’m not a tranny expert, but that does not sound right to me.
You can get your tranny to automatically shift at the WOT rpm you want in both shifts. It is a multi step process and you’ll be under the car at least a few times as it is a trial and error to dial it in. Maybe a new thread if you are interested.
The 1-2 shift valve spring needs to be stiffer. Rick Allison has springs but they were too stiff for mine. I ordered a handful of springs from Lee Springs. You need to start by getting the 2-3 shift where you want it first with the governor. The easiest way is to take weight out of the inner weight.I've rebuilt a few. The 1-2 is controlled by a spring in the valve body. I haven't tried swapping springs.
So I have been looking at my combo and thinking about getting a new cam with a bit more duration but was wondering if that is my bottleneck for more power. Not too woried about street manners and would like something a bit more lumpy at idle. I do intend to race a bit at the track in Roswell, which is 3573 elevation.
Here is what I currently have...
440 block, .040" over, stock stroke
KB 237 pistons zero deck
FelPro head gaskets .039" compressed
Stealth Heads, CNC ported (Intake 311cfm @.550 lift / exhaust 210cfm @ .550" lift)
Hughes 1.5 Rocker arms
Holley Sniper EFI 550 (650 max HP)
Holley Street Dominator single plane intake
1 7/8" long tube headers into 2.5" exhaust
Pertronix Ignitor III
Cam - Hughes STL3842BS solid lifter, 105* centerline, Duration at .050" 238* / 242*, Lift .558" I / .564" E
PTC 9.5" torque converter
3.55 rear end ratio on 275/65 R15 tires
Air in, air out right? I like the cam but the engine seems to top out a little over 5700 rpms, which is where the cam power band ends. I was thinking a similar cam with more duration to bump the power up into the 5900 - 6000 rpm range. Car has plenty of power down low as it sits. But am I hitting a road block with the intake or the headers or even the heads?
Best 1/4 and E.T at 3573 elevation was a 13.15 @ 106.81
Looking at the Hughes STL4650BS, centerline 104*, duration at .050" 246* / 250*, Lift .576 I / .588" E. I would be able to keep my springs as the specs are identical as to pressure. And I want to stay with solid lifter. I'm not interested in going roller.
Heads were purchased 2017, not milled. Tires are M/T ET DOT rated street slicks. 275/65R15. 37 degrees total timing. Initial is at 21 degrees. Light springs brings total in around 2200 rpms. Any more timing and it pings on 91 premium gas.Here's what I've gathered. You're at altitude of about 3500ft. The actual compression ratio is between 9.9-1 and 10.3-1 depending on if it's early 84CC or later 80 cc Stealth heads. Or if they've been milled. Either way at higher altitudes, fairly big cam, low compression is taking away power. If it has sticky M/T's it should hook. You don't mention if they are street radials or something else. I don't see 265's in M/T's line up. Car doesn't appear to spin much if at all in the video. First thing you need to do is use the tach. That motor will like close to +/-6000 rpm shift. In the video it wasn't close. Second it needs to hook. It may need better tires to do that. No trailer? Spare set and a floor jack. Or get something for minimal street use. Make sure it's tuned. Decent A/F and timing
(35? total). It would like more gear. The biggest improvement in the motor in my opinion would be more compression. Especailly at your altitude. Until you are at this point anything new parts are not a wise choice. Rocker arms, big headers, etc. I honestly think with proper shift points, tune, and traction it'll get into the mid 12's as is. 4500ft D/A is probably close to 9.5% power killer over dyno air. So we're talking close to 50hp. Compression and gear will help overcome that.
Those tires should work. Are they radial or bias? Radials start at 19psi. Bias start around 15psi. I'm assuming standard street shocks.Heads were purchased 2017, not milled. Tires are M/T ET DOT rated street slicks. 275/65R15. 37 degrees total timing. Initial is at 21 degrees. Light springs brings total in around 2200 rpms. Any more timing and it pings on 91 premium gas.
Milling heads would be the easiest option. I'm looking for 3.73 gears but I haven't had luck on in stock sets.
Hmmm. With a combo like yours you would think that you could run better than 17.094I think you have potential to run a lot quicker, you have better flowing heads than I do. I have a similar combo and was running about what you are. I swapped out my street tires and 3.23's for drag radials and a 4.10 gear, went to a 1.6 ratio arm, DA shocks on 4 corners and a little head work myself and had a backcut put on the intake valves.
440/448ci, edelbrock rpm heads and intake, 850 quick fuel, XE282S, 1 7/8" headers, 2.5" exhaust dynomax welded mufflers, 727 11" converter. 4.1:1 gear. 3900lbs all up. Looking at a converter upgrade and open pipes with header extensions in the progression to lower ET's.
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