• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Ran my car on a Dyno this weekend

It is unlikely any valve float is being caused by the 440 Source valve springs. The 924 springs that Comp recommends for that camshaft have less seat and open pressures than the 440 Source springs. There may have been an error in installed heights when switching to other retainers, or another guess would be incorrect lifter preload. There are two different lifters from Comp Cams for that camshaft and the lifter preload requirements are very different. Set up correctly the 440 Source valve springs will handle that cam throughout it's 2000-5800 rpm range.

350-360 rwhp if very stout for a 383.
 
Springs

SublimeSixpack said:
Those are good power numbers! But Comp's site states that cam's range is 2000 to 5800 RPM. If the valves are indeed floating beyond 5000 RPM I'd be changing to different springs. You might just as well get all the performance you can from that camshaft.
Click to expand...
Springs may be on the week side,but don't forget at your altitude,you can knock off about 500 rpm because we have less air.Should still rev,just stop making power.
 
Look closer at your valve train geometry and such I have not one tenth of a percent of iq52s experience but I've seen that to be most on on any brand performance v8 nowadays when it comes to mistakes breakage and valve train issues I also have seen 3 sets of 440 source heads in person and all 3 had installed heights all over the place on the first set.
 
Wow, thanks for the feedback guys. I just got back from TDY so I'm just catching up on my own thread. As I said before, I'm just learning all this stuff about lifter preload and what not. IQ52 are you suggesting I have too much preload or not enough? I did go through my driver's side valve train cause it seemed noisy and I could push the push rod side of the rocker down and cause a gap between the spring and rocker so I tightened it until that went away and the noise disappeared. I also didn't realize lifter preload requirements change depending on camshaft used. I thought it was a generic preload.

Diesel, what do you mean by installed heights?
 
I didn't think it was but is there usually play like that? I tried setting them the way the instructions say but it seemed there was little to no play in the pushrod when the rockers were adjusted all the way out so I didn't want to turn them to tight.
 
If the exhaust is burning your eyes, the idle mixture is probably actually LEAN. Common problem with a stock jetted carb and aftermarket cam.
 
Burning eyes = a lean condition? Thanks for the info Tempest, I assumed the opposite that it was rich and the fuel wasn't being burned completely. I guess I better go readjust my idle mixture screws.
 
You must log in or register to reply here.

Similar threads

Tex013
Ran Sunset Nationals last weekend
Replies
5
Views
665
Tex013
Tex013
patrick66
Picking up a '66 Coronet 440 sedan this weekend
Replies
4
Views
842
patrick66
patrick66
66 Sat
Poly Stroker on the Chassis Dyno
2
Replies
25
Views
2K
polyjohn
polyjohn
R
Getting Ready for the Weekend!!!!!
Replies
11
Views
677
Rick@Laysons
R
Greg - Mopar2U
First Car - resto mod: '71 Charger SE
2
Replies
20
Views
1K
Greg - Mopar2U
Greg - Mopar2U
Auto Transport Service
Back
Top