Refurb or Rebuild?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Yeah, I was planning on a spacer. I wonder if there's such a thing as a 2" thick, 4 hole phenolic spacer? That little extra low end torque would be nice, even though it really doesn't "need" any help...... There's plenty of room for a 2", or 2........
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Dunno 'bout a factory 2", but there's a place in Tulsa that sells odds and ends of plastic. If they had phenolic and you knew someone with a mill....... Or, make it out of wood?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
The plot thickness a bit here. On the 390, all of the "high Performance" intake gaskets have the heat riser passages blocked off completely. This would reduce the intake temp quite a bit, so a plastic/wooden spacer really wouldn't be needed.
I know the heat riser also feeds the EGR on the current intake, but the performer intake is non-EGR. The question really becomes, will blocking the heat risers cause cold driveability problems?
I know we've had different opinions about carb size. I'm sticking with the 600, since it's big enough to feed a 400 HP 400 CID engine up to 5000+ RPM. I doubt the engine makes 400 HP, and will likely never see 5000, much less any higher. Besides, I'd rather have the improved throttle response from the smaller carb. That, and the smaller primaries *should* make for a slight increase in MPG. An FE needs all the help it can get MPG-wise......
I know the heat riser also feeds the EGR on the current intake, but the performer intake is non-EGR. The question really becomes, will blocking the heat risers cause cold driveability problems?
I know we've had different opinions about carb size. I'm sticking with the 600, since it's big enough to feed a 400 HP 400 CID engine up to 5000+ RPM. I doubt the engine makes 400 HP, and will likely never see 5000, much less any higher. Besides, I'd rather have the improved throttle response from the smaller carb. That, and the smaller primaries *should* make for a slight increase in MPG. An FE needs all the help it can get MPG-wise......
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Dave said on Page 3 something like "Whatever you do, don't block the heat passages. Been there, done that." As you know, Dave knows what he's talking about and I don't. My guess is that the 390 will be cold-blooded in the extreme w/o the heat.
One thing I've wondered is what would happen if you blocked off only one side, like using one hipo gasket and one standard. Does it take flow? Would it get hot enough but not too hot? May actually not be much flow at all since you are going with headers and, presumably, true dual exhaust - although not having an x-pipe is said to leave torque laying on the street.
Perhaps Dave will jump in and let us know how many permutations on the block-off option he's tried. Otherwise, I'd not block them.
One thing I've wondered is what would happen if you blocked off only one side, like using one hipo gasket and one standard. Does it take flow? Would it get hot enough but not too hot? May actually not be much flow at all since you are going with headers and, presumably, true dual exhaust - although not having an x-pipe is said to leave torque laying on the street.
Perhaps Dave will jump in and let us know how many permutations on the block-off option he's tried. Otherwise, I'd not block them.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Blocking one side will pretty much block it all. On the factory EGR manifold, it could still flow thru just one side, but at a reduced rate.
The heat risers were typically blocked on these engines when they were converted to LP, since the LP didn't require the heat. That system used a coolant heated vaporizer to assist the LP in becoming a vapor, in spite of it's -44F boiling point.
LP/gas dual fuel, they were usually just left alone.
As for the headers, they're still quite a ways down the road, if ever. Only bought them because of the "smokin" package deal.
The heat risers were typically blocked on these engines when they were converted to LP, since the LP didn't require the heat. That system used a coolant heated vaporizer to assist the LP in becoming a vapor, in spite of it's -44F boiling point.
LP/gas dual fuel, they were usually just left alone.
As for the headers, they're still quite a ways down the road, if ever. Only bought them because of the "smokin" package deal.
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