Need some advice
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Senior User
Joined: Oct 2005
Posts: 130
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Need some advice
I am not sure what to do. Right now I have a 390gt in my truck and it runs ok. It burns oil tho (even tho the motor is new) so I think I am gonna pull a head and see whats up. It ran pretty good wheen wheeling except it always floods itself on downhill and dies. My options were to either go to an efi 460 or build up this motor. I am thinking about throwing a 428 crank and rods into it, bumping up the cam, getting the heads done and a few more goodies. What do you guys think I should do? Should carbs flood that easily? Any buildup info on a 390 would be great thanks.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Flooding going down hill is the rear float slooping fuel thru the vent anf flooding the engine. Either float setting is too high or you need to install some vent extensions so the fuel can't sloop over. For offroad work you really need the extensions in both bowls. Try these:
http://www.holley.com/26-40.asp
http://www.holley.com/26-40.asp
Senior User
Joined: Sep 2004
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From: Texas
Posting Guru
Joined: Jul 2003
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From: Eureka, Ca.
I have the 670 Truck Avenger. I had to do a little adjusting to get it to not hesitate off idle with my large cam. I dot. have it tuned completely yet but it runs at very steep angles. Near verticle and at more of a side angle than I am comfortable running. On the near verticle it didn't want to idle but would run just off idle.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by 66beater
could also try one of these. http://www.holley.com/data/types/pic...TA%20intro.jpg
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by Randyb12
I have the 670 Truck Avenger. I had to do a little adjusting to get it to not hesitate off idle with my large cam. I dot. have it tuned completely yet but it runs at very steep angles. Near verticle and at more of a side angle than I am comfortable running. On the near verticle it didn't want to idle but would run just off idle.
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Posting Guru
Joined: Jul 2003
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From: Eureka, Ca.
I don't know any thing about the street avenger. I do know the TA is better than the Edel for my situation.
But like above the vent extensions are alot cheaper if the only issue is flooding when going down hill.
Maybe adjust the float too.
But like above the vent extensions are alot cheaper if the only issue is flooding when going down hill.
Maybe adjust the float too.
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well, this hasn't been commented on yet so here goes:
The 428 and the 390 share the same rods, so all you need there is the 428 crank and correct pistons. I think pistons for this combination are available through the forum sponsor.
http://www.survivalmotorsports.com/
The 428 and the 390 share the same rods, so all you need there is the 428 crank and correct pistons. I think pistons for this combination are available through the forum sponsor.
http://www.survivalmotorsports.com/
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I love it when guys just talk about "throwing" a 428 crank into a 390. Easier said than done now. 428 cranks aren't exactly plentiful. And the power difference over the 390 crank isn't hardly worth the cost. 20-30 ft lbs. Not much difference there. And a 460 swap entails more cost, you have to replace the transmisson too. Just build up your 390 and tell everyone it's a 428. No one will know but you.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
You're exactly right here. He would probably be better off just building up the 390. But he asked about it so I figured I'd try and help out.
428 cranks are quite available though if you're willing to spend the money. See the link I posted above. They sell Scat crankshafts, among other things. Scat makes a reproduction 428 crank. If I read their price list right, it's $664.05. They can be had, for a price. Is that price worth it for what you'd gain over a 390? I dont think so...
428 cranks are quite available though if you're willing to spend the money. See the link I posted above. They sell Scat crankshafts, among other things. Scat makes a reproduction 428 crank. If I read their price list right, it's $664.05. They can be had, for a price. Is that price worth it for what you'd gain over a 390? I dont think so...
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Originally Posted by Randyb12
I don't know any thing about the street avenger. I do know the TA is better than the Edel for my situation.
Originally Posted by rusty70f100
428 cranks are quite available though if you're willing to spend the money. See the link I posted above. They sell Scat crankshafts, among other things. Scat makes a reproduction 428 crank. If I read their price list right, it's $664.05. They can be had, for a price. Is that price worth it for what you'd gain over a 390? I dont think so...
3) 4.080 bore x 4.25 stroke, 6.385 rods
Scat cast crank, I beams
modified Probe "410" flat tops or dished - you pick
file fit rings, bearings, balancer, flexplate
$1995 shipped to your door
I've been wondering about this some time. Most performance people look for gains in a RPM range that I don't wheel in. Just how much difference will you see below 3000 rpm?
BTW: nice to see ya here Ross!
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
If you're going to spend $600-700 for a crank, you'd just as soon go with a 4.25 inch armed one. I couldn't say what gains you'd see, but in stroking it 1/2" you'd see some good numbers down low. Sorta like you'd see in replacing the crank in a 351M with a 400 crank.