Header/4bbl intake questions
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Elder User
Joined: Nov 2010
Posts: 536
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From: Jacksonville, NC
Header/4bbl intake questions
Alright, so I've saved up about half of what it's gonna cost for a mini-starter, Edelbrock 1403, Offy intake, and a set of headers. Now, I've already done alot of research about the EFI manifolds, but I've decided not to go that route, and decided on headers instead, coupled with a mini-starter. However, I do have some questions.
First, is there any way to prevent the header from leaking at the gasket? I'll be switching to grade 8 studs, etc., but is there a way to tighten them down, run and re-torque twice and be done? I don't want to be constantly re-torquing my header bolts/nuts..
Second, I've decided to go with an Offy intake instead of a Clifford, but which one would be best for a daily driver/off-road application? The 'C' model or the 'DP' model? What's the difference, performance/flow wise, aside from one being a dual plane?
I've probably got a couple more questions, but after a 14 hour shift at work, I'm exhausted and my brain's fried. Thanks alot, guys, in advance.
First, is there any way to prevent the header from leaking at the gasket? I'll be switching to grade 8 studs, etc., but is there a way to tighten them down, run and re-torque twice and be done? I don't want to be constantly re-torquing my header bolts/nuts..
Second, I've decided to go with an Offy intake instead of a Clifford, but which one would be best for a daily driver/off-road application? The 'C' model or the 'DP' model? What's the difference, performance/flow wise, aside from one being a dual plane?
I've probably got a couple more questions, but after a 14 hour shift at work, I'm exhausted and my brain's fried. Thanks alot, guys, in advance.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
I think the first key to eliminating exhaust leaks is to ensure the exhaust/header flange and intake mounting tabs are the same thickness. Beyond that, switching to studs and using locking nuts should help keep them snug - although a occasionally checking them for tightness is never a bad idea.
DP vs. C? If the engine will remain otherwise stock I'd say DP, if you're planning on a new cam, porting, etc. down the line I'd say C. I've got a C and EFI manifolds on an otherwise stock 300 and it works fine, but have no frame of reference for comparison vs. the DP manifold. I believe a cat named Buddy Rawls (over at the FSP board) made the swap from DP to C, search over there for the post.
DP vs. C? If the engine will remain otherwise stock I'd say DP, if you're planning on a new cam, porting, etc. down the line I'd say C. I've got a C and EFI manifolds on an otherwise stock 300 and it works fine, but have no frame of reference for comparison vs. the DP manifold. I believe a cat named Buddy Rawls (over at the FSP board) made the swap from DP to C, search over there for the post.
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
If you are running the Edelbrock 1403 carb I'd go with the Offy C-series intake.
And you might want to invest in a starter heat shield wrap. That will let your starter survive longer with the heat of the header/s by it.
And you might want to invest in a starter heat shield wrap. That will let your starter survive longer with the heat of the header/s by it.
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 380
From: Near Los Angeles
I have read a few posts where the writer said they could tell a performance increase just changing from the DP to the C. I chose the DP for mpg. That is the essence of the choice.
Use Mr. Gasket #260 int/exh gasket. I have run the header/studs/crimp nuts for about two years w/o problem. But it has to tightened in sequence. I blew out the first gasket by tightening one nut seperately and cracked the gasket!
When you do the install, take the oem thick washers and grind one side down on a bench grinder so they sit flat from intake to header. Torque in sequence, heat, retorque, heat, retorque, and forget about it.
Oh, almost forgot: a company names Remflex makes a graphite gasket for the 300. I've never heard from anyone who actually used one.
Use Mr. Gasket #260 int/exh gasket. I have run the header/studs/crimp nuts for about two years w/o problem. But it has to tightened in sequence. I blew out the first gasket by tightening one nut seperately and cracked the gasket!
When you do the install, take the oem thick washers and grind one side down on a bench grinder so they sit flat from intake to header. Torque in sequence, heat, retorque, heat, retorque, and forget about it.
Oh, almost forgot: a company names Remflex makes a graphite gasket for the 300. I've never heard from anyone who actually used one.
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
I have read a few posts where the writer said they could tell a performance increase just changing from the DP to the C. I chose the DP for mpg. That is the essence of the choice.
Use Mr. Gasket #260 int/exh gasket. I have run the header/studs/crimp nuts for about two years w/o problem. But it has to tightened in sequence. I blew out the first gasket by tightening one nut seperately and cracked the gasket!
When you do the install, take the oem thick washers and grind one side down on a bench grinder so they sit flat from intake to header. Torque in sequence, heat, retorque, heat, retorque, and forget about it.
Oh, almost forgot: a company names Remflex makes a graphite gasket for the 300. I've never heard from anyone who actually used one.
Use Mr. Gasket #260 int/exh gasket. I have run the header/studs/crimp nuts for about two years w/o problem. But it has to tightened in sequence. I blew out the first gasket by tightening one nut seperately and cracked the gasket!
When you do the install, take the oem thick washers and grind one side down on a bench grinder so they sit flat from intake to header. Torque in sequence, heat, retorque, heat, retorque, and forget about it.
Oh, almost forgot: a company names Remflex makes a graphite gasket for the 300. I've never heard from anyone who actually used one.
I know the Remflex gaskets work great on a V8. But I've never tried them on a 300.
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