Engine mod's update: Buster's 302
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Engine mod's update: Buster's 302
R&R'd the stock heads and installed the Ford Racing GT-40 heads. Threw a valve (on the intake side; piston came down on it and bent the top; no damage to piston) on initial test drive. Tolerances off on that one. Sent BOTH heads back to Ford Racing per their request. They went thru them both; sent them back w/in 10 days. R&R'd them again. Works fine. CompCam 268 cam/lifter kit went in w/o a hitch.
Had to re-jet and adjust the air & fuel on the carb to accommodate the new cam/lifters (.486 lift). Additional vacuum caused some prob's w/ AOD shift points, but am installing a vac can Monday to even things out and get some braking back.
Took a 550 mile trip two days ago; ran fine (13mpg @ 65-75 mph). Can't complain...
Additional torque/hp thru higher rpm's and STRONG pull off the line, esp w/ the 3.55 rear gears.
Butch n Me
PS- ok Fergie, now let's hear it; your turn....
Had to re-jet and adjust the air & fuel on the carb to accommodate the new cam/lifters (.486 lift). Additional vacuum caused some prob's w/ AOD shift points, but am installing a vac can Monday to even things out and get some braking back.
Took a 550 mile trip two days ago; ran fine (13mpg @ 65-75 mph). Can't complain...
Additional torque/hp thru higher rpm's and STRONG pull off the line, esp w/ the 3.55 rear gears.Butch n Me
PS- ok Fergie, now let's hear it; your turn....
Last edited by DS59F100; Oct 10, 2003 at 08:09 AM.
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From: Ventura County, CA
Buster is out. It's Butch. I didn't like the bad omen attached to "bust" er. That's all I need is to fix something else on this truck!
No name for the tranny yet; don't think I'll give it one. I did call it a few choice words the other day though before we figured out it needed adjusting after the vacuum problem resulting from the new cam. I've since apologized and we made up. I upgraded it to the mid-grade gas(89 octane) from now on. We're happy again.
No other mod's for the engine planned. I am happy with the performance increases, but feel like there's still some fine-tuning that needs to happen b/t the carb/vac/trans, shift points, etc to optimize the set up to its fullest. Great punch from a dead stop (but still can't light em up).
And, he has a very nice "rumpity-rump" about his idle. It's actually a bit disappointing: he sounds bad-*** idling, but when I try to stomp on it, he doesn't go as fast as he sounds! Heavy old trucks.... !!!
Butch n Me
No name for the tranny yet; don't think I'll give it one. I did call it a few choice words the other day though before we figured out it needed adjusting after the vacuum problem resulting from the new cam. I've since apologized and we made up. I upgraded it to the mid-grade gas(89 octane) from now on. We're happy again.
No other mod's for the engine planned. I am happy with the performance increases, but feel like there's still some fine-tuning that needs to happen b/t the carb/vac/trans, shift points, etc to optimize the set up to its fullest. Great punch from a dead stop (but still can't light em up).
And, he has a very nice "rumpity-rump" about his idle. It's actually a bit disappointing: he sounds bad-*** idling, but when I try to stomp on it, he doesn't go as fast as he sounds! Heavy old trucks.... !!!
Butch n Me
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From: Iowa
"Great punch from a dead stop (but still can't light em up).
And, he has a very nice "rumpity-rump" about his idle. It's actually a bit disappointing: he sounds bad-*** idling, but when I try to stomp on it, he doesn't go as fast as he sounds! Heavy old trucks.... !!!"
Daryl
Somethings wrong here if she/he won't light up the tires with those mods. You have a little more cam, and a lot more heads than I do. All I have on you is slightly lower gears and perhaps a lighter truck.
What carb and ignition are you running? You got a pretty well matched set of bolt-ons on the engine. It's time to double back and look at the basics. Good fuel pump with proper pressure. Correctly operating ignition system (could be stock system). Carburetor with good fuel control and correct size for your street 302. I am kinda surprised you need a vacuum can for that cam. makes me wonder is something else is affecting the idle vacuum. What size valves are in those GT-40s?
I'm not pretending my 302 pulls the front wheels, but you should be tearing up the tires real good from a dead stop.
And, he has a very nice "rumpity-rump" about his idle. It's actually a bit disappointing: he sounds bad-*** idling, but when I try to stomp on it, he doesn't go as fast as he sounds! Heavy old trucks.... !!!"
Daryl
Somethings wrong here if she/he won't light up the tires with those mods. You have a little more cam, and a lot more heads than I do. All I have on you is slightly lower gears and perhaps a lighter truck.
What carb and ignition are you running? You got a pretty well matched set of bolt-ons on the engine. It's time to double back and look at the basics. Good fuel pump with proper pressure. Correctly operating ignition system (could be stock system). Carburetor with good fuel control and correct size for your street 302. I am kinda surprised you need a vacuum can for that cam. makes me wonder is something else is affecting the idle vacuum. What size valves are in those GT-40s?
I'm not pretending my 302 pulls the front wheels, but you should be tearing up the tires real good from a dead stop.
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Great punch from a dead stop (but still can't light em up).
Let me know how that interior turns out. Also, if you can somehow, try and get a sound clip! I really want to hear a built 302 lope the idle a few times.
-4speed
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Daryl "Butch 302" Stone,
Did I read that that right?
A cam,
GT40 heads,
A carb,
Headers,
and you can't light them up! How many pistons did you put in it when you built it? All eight? It takes eight, you know that, right?
I don't even know you!
Gawd, what the heck am I gonna get out of the namby-pamby Speed Density thing I have?
Later,
Did I read that that right?
A cam,
GT40 heads,
A carb,
Headers,
and you can't light them up! How many pistons did you put in it when you built it? All eight? It takes eight, you know that, right?
I don't even know you!
Gawd, what the heck am I gonna get out of the namby-pamby Speed Density thing I have?
Later,
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From: Ventura County, CA
FatFenders,
I know... I need to fix something, somewhere. I am looking into having it dyno'd after I get the vac can installedand then have the
AOD adjusted to accommodate the new "goodies".
I have a Carter 625cfm 4-bbl carb. The heads are 1.94/1.54 (if memory serves; I know they're NOT 2.02's on the intake side).
Daryl
I know... I need to fix something, somewhere. I am looking into having it dyno'd after I get the vac can installedand then have the
AOD adjusted to accommodate the new "goodies".
I have a Carter 625cfm 4-bbl carb. The heads are 1.94/1.54 (if memory serves; I know they're NOT 2.02's on the intake side).
Daryl
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From: Iowa
Daryl
Don't get discouraged. This sort of stuff is often the result of mismatched speed parts by an overzealous builder. From what you have posted, that is NOT the case at all this time. Your mods are completely appropriate for the application. When this stuff happens, the first reaction is to throw more speed parts at it. The best course is to check the basics again. Fuel pressure, compression, ignition system. Assuming some grevious error was not made during longblock assembly, you're going to find something real stupid and possibly obvious wrong with your engine.
The low idle vacuum has me concerned as a possible clue. I'd like to know what cylinder compression you're pulling now. Something like a problem with pushrod length is a possibilty. I'm afraid the valves may not be closing correctly. That will kill vaccum everytime. A vacuum can isn't going to fix that.
Don't get discouraged. This sort of stuff is often the result of mismatched speed parts by an overzealous builder. From what you have posted, that is NOT the case at all this time. Your mods are completely appropriate for the application. When this stuff happens, the first reaction is to throw more speed parts at it. The best course is to check the basics again. Fuel pressure, compression, ignition system. Assuming some grevious error was not made during longblock assembly, you're going to find something real stupid and possibly obvious wrong with your engine.
The low idle vacuum has me concerned as a possible clue. I'd like to know what cylinder compression you're pulling now. Something like a problem with pushrod length is a possibilty. I'm afraid the valves may not be closing correctly. That will kill vaccum everytime. A vacuum can isn't going to fix that.
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The rods are 1.7's with full roller rockers. I suspect the fuel delivery, too. I had the pro shop (H.L. Shahan) do the (Mallory) distributor long before the cam & heads. So, I don't think it's that, but I'll go over it with "H" and get his professional opinion. He rejetted the carb, but I agree, I think it's missing somewhere and it's probably nothing major. I don't plan on throwing my hp parts at it. 'Sa-nuff already!!!!
Not discrouraged; just curious
Daryl
Not discrouraged; just curious
Daryl
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From: Oxford, Indiana
You're right, Daryl. Something is wrong here. I smell trouble with the tranny. An AOD has no vacuum modulator and could give a rat's *** less what kind of vacuum signal the engine produces. The only thing it will ever care about is throttle position. Exactly what kind of adjustments are being made to it? Are you sure that the shift linkage is set up right and that you are actually starting off in first gear?!? Also, I have no patience for analyzing cam specs for free, but with the new cam, the possibility also exists that your powerband has been shifted high enough that you are experiencing a bog off idle with your power coming on after the truck is already moving. The solution there would be a higher stall converter. Just a couple things to fret about.
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From: Iowa
"the possibility also exists that your powerband has been shifted high enough that you are experiencing a bog off idle with your power coming on after the truck is already moving."
The 1.7 rockers are likely to push the power band up just a bit more than the camshaft maker advertises. The dyno would answer this though. I'd do that before I used a stall converter on a daily driver.
The 1.7 rockers are likely to push the power band up just a bit more than the camshaft maker advertises. The dyno would answer this though. I'd do that before I used a stall converter on a daily driver.