'69 440 Upgrade combo...your thoughts?

[wyrmrider]

with that compression you advanced the cam?
you're braver than I am
do you remember what the cranking compression was? but then we could get 100 Chevron Supreme
I'm thinking that with little cut 915's and the 6 pack pistons you might have been at a real 10.5-11:1 with a felpro gasket
we did that all the time back in the day to get the compression up to what Chrysler advertised- and there were no aluminum heads
I must have got my threads mixed up thinking you had 3.23s - 3:54 and 4 speed let's see what happens
still curious about the compression
no quench but still you are shoving most of the volume over near the spark plug- let's see if it takes as much advance as you are used to

 

[BSB67]

that comp cam has the potential to be 1/2 step worse than the mopar cam when using manifolds.

Yes

 

[69 R/T]

Is that because of the long duration and LSA? Cam selection is the toughest part. Everyone has a favorite, but they're all different.

 

[BSB67]

Is that because of the long duration and LSA? Cam selection is the toughest part. Everyone has a favorite, but they're all different.

Yes

 

[Garys1969RR]

I'm running 6 pack intake, 6 pack pistons, .010 down, Eddy Perf RPM heads, .020 gasket, getting around 11 to 1 C/R. Premium fuel works well unless it's too hot, I am at 5400 feet elevation. This may not work at sea level. Voodoo roller cam with 243 intake duration @ .050.

 

[lewtot184]

Is that because of the long duration and LSA? Cam selection is the toughest part. Everyone has a favorite, but they're all different.

108lsa, 72 degrees overlap; don't go there with manifolds. you don't need lumpy cams to make power. i'm going to guess that BSB67's 67 charger made north of 430hp (not inflated magazine/internet power, but with all accessories and buttoned up) on the 272/.455 cam with manifolds, and that was 30yrs ago. what can we do now, knowing what we know, and with the newer parts available?

 

[lewtot184]

what pistons are you using to get the 9.3:1 with '906 heads?

 

[Sweet5ltr]

Crane ductile iron rockers and MP .528 solid-lifter camshaft for any RB engine running exhaust manifolds.

It's around .500" lift (1.5RR) after lash.

 

[wyrmrider]

half step is about right
same timing but steeper ramps and more area under the curve
I think he said Sealed Power 9.3
let's see- that would be about 10:1 with wedge heads BTW IDK forged or cast PN would be nice or compression height
I have my vintage Sealed Power catalog boxed up but I can look it up this afternoon
Just another reason to audit the presumed c.r.

 

[wyrmrider]

recall that in the mag article the 238 Racer Brown worked better
and that is not a modern cam
I'm thinking of staying south of 238 with Magnum exhaust maniafolds (did i just write that?)

 

[69 R/T]

what pistons are you using to get the 9.3:1 with '906 heads?

Speed Pro 350N flat tops. Should be 9.3 with the Stealth heads, about 9.0 with 906's according to literature. Those are what's in there now, and I get about 155-165 cranking cylinder pressure

 

[lewtot184]

Speed Pro 350N flat tops. Should be 9.3 with the Stealth heads, about 9.0 with 906's according to literature. Those are what's in there now, and I get about 155-165 cranking cylinder pressure

is that cylinder pressure reading with a stock cam?

 

[lewtot184]

I can't find a listing for that piston. do you have any details?

 

[69 R/T]

is that cylinder pressure reading with a stock cam?

Yes, stock HP grind cam.

 

[69 R/T]

I can't find a listing for that piston. do you have any details?

Federal Mogul/Speed Pro Piston Part
Number

Application Power Range Special requirements
Compression information

Ring groove size

Pin diamater

Rod length

Stroke

Deck clearance

Skirt clearance

350NP30 and a set of Hastings Cast Rings (692-030)

As of time listed, ONLY +.030", +.040" and +.060" pistons available. Please contact us for up-to-date size availability.





Chrysler 440 (4.350" at 030" bore) 1966-71 Car w/ 4-BBL carb. flat head



idle to 6000+rpm Good for mild street/strip
1.990 compression distance

Compression ratios (w/ +.030" bore):

w/ 78.5cc heads: 9.33:1

w/ 88cc heads: 8.66:1
5/64" 5/64" 3/16" ring grooves

1.0939" pin diam. - pins included

for stock length rods

PRESS ONLY

3.750" stroke

.089" deck clr

.0015" skirt clr

 

[lewtot184]

Federal Mogul/Speed Pro Piston Part
Number

Application Power Range Special requirements
Compression information

Ring groove size

Pin diamater

Rod length

Stroke

Deck clearance

Skirt clearance

350NP30 and a set of Hastings Cast Rings (692-030)

As of time listed, ONLY +.030", +.040" and +.060" pistons available. Please contact us for up-to-date size availability.





Chrysler 440 (4.350" at 030" bore) 1966-71 Car w/ 4-BBL carb. flat head



idle to 6000+rpm Good for mild street/strip
1.990 compression distance

Compression ratios (w/ +.030" bore):

w/ 78.5cc heads: 9.33:1

w/ 88cc heads: 8.66:1
5/64" 5/64" 3/16" ring grooves

1.0939" pin diam. - pins included

for stock length rods

PRESS ONLY

3.750" stroke

.089" deck clr

.0015" skirt clr

this piston is basically a stock cast replacement '67 10:1. be very careful hot rodding these. they will take some moderate performance gains, but no high rpm, and will need a good tune-up to run on pump gas and not crack. they will have a poor quench distance with any head. these are definitely not a high performance piston and the cast rings are economy stuff. I think i'd take little more conservative approach to the build.

 

[69 R/T]

this piston is basically a stock cast replacement '67 10:1. be very careful hot rodding these. they will take some moderate performance gains, but no high rpm, and will need a good tune-up to run on pump gas and not crack. they will have a poor quench distance with any head. these are definitely not a high performance piston and the cast rings are economy stuff. I think i'd take little more conservative approach to the build.

This rebuild was done about 17 years ago, and it's the way I bought the car about 9 years ago. He obviously did a budget rebuild for a matching numbers show car. I got the hot rod bug helping my buddies build their "whore" cars.

 

[1967coronet440]

Here’s my old .030 440 with 906 heads .284 purple cam Holley 750 3.91s Hedmans headers, ran good but not much performance i think it turned a 13.2 at 10x mph could’ve benefited with a better intake and smaller carb I think.

 

[69 R/T]

Here’s my old .030 440 with 906 heads .284 purple cam Holley 750 3.91s Hedmans headers, ran good but not much performance i think it turned a 13.2 at 10x mph could’ve benefited with a better intake and smaller carb I think.

Sounds bitchin'

 

[lewtot184]

knowing what I know now and from years of goofing up (LOL), this is what i'd do. run the ch4b and the 750 carb is ok but really won't make more power than a stock big AVS. stealth heads are probably at the bottom of the bucket when it comes to alum heads. they don't flow anywhere near advertised. i'd have somebody check them out and make sure all the parts are up to snuff, (IQ52 is a member here and could do this and he's not too far away from you). i'd use a fel-pro 8519 head gasket and compression will be around 9.2:1. the cam you listed in my opinion is a no-go. i'd take a couple of steps back. you might be surprised at the cheapo summit 6401 with the crane rockers (the true ratio will be higher than advertised) and it will work fine with cast exhaust. you'll have to carefully check rocker geometry and will probably need custom length push rods with those heads. I doubt your chevy guy has done this on a mopar; chevies are set up different. don't know what your doing for ignition but the FBO (4sec flat, owner is a member here, Don Gould) rev-limiter box package and advance control plate with a mopar distributor is a good economical package. keep in mind that stock 375hp 440's had a peak power rating at 4600rpm and peak power with this combo is probably around 5000rpm. 5000-5300rpm should be safe with this combo but I wouldn't push it!