300i6 performance upgrades
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I have a 300 straight six and I upgraded to an Offenhauser DP intake, Edelbrock 1403 and Hedman header. It really woke it up but was a pain to install.
Note that "would I gain much power" is a qualitative question. Obviously the truck has more power than it did, but I have no way of knowing how that compares to what YOU determine to be a waste of money or not.
Note that "would I gain much power" is a qualitative question. Obviously the truck has more power than it did, but I have no way of knowing how that compares to what YOU determine to be a waste of money or not.
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Senior User
Joined: Jan 2013
Posts: 303
Likes: 0
fmc400, I'm just wanting to gain a little more "passing" power, from the replays it seems that I would get what I'm looking for, and what was the issues on installing? Thanks
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Hotshot
Joined: Jan 2011
Posts: 13,142
Likes: 348
From: THIS IS SPARTA!, ...Mo.
Another thing to consider is, yes it's a six, but it's a big dang six. They made several V8s that were smaller. I would go with 500 cfm on the carburetor. (It's 300 cubic inches) I've already put 600 cfm on a 302.
For the record, when I build mine, I plan on doing a bigger cam, intake, header, and 600 cfm. I don't see much of a difference between a 300 cubic inch engine and a 302 cubic inch engine.
For the record, when I build mine, I plan on doing a bigger cam, intake, header, and 600 cfm. I don't see much of a difference between a 300 cubic inch engine and a 302 cubic inch engine.
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Installation issues: the DP intake makes the carburetor sit 90 degrees from how it would normally sit, which creates some challenges when setting up the throttle linkage. My setup was further complicated by the fact that my AC box prevented me from putting anything behind the carburetor. I ended up having to get pretty creative with a custom-made throttle bracket that pulls forward from the front of the carburetor.
The header was equally painful; I had to reroute my transmission lines and a brake line. I had to shave off part of the alternator bracket. I also had to switch to a mini-starter and perform the associated wiring changes. The original starter is too big to remove with the header in place. I'm not saying it wasn't worth it, but what I am saying is that an inline engine presents a few geometrical challenges that you wouldn't face with a V8. I'm just happy they make this stuff for this engine to begin with.
The header was equally painful; I had to reroute my transmission lines and a brake line. I had to shave off part of the alternator bracket. I also had to switch to a mini-starter and perform the associated wiring changes. The original starter is too big to remove with the header in place. I'm not saying it wasn't worth it, but what I am saying is that an inline engine presents a few geometrical challenges that you wouldn't face with a V8. I'm just happy they make this stuff for this engine to begin with.
Senior User
Joined: Jul 2009
Posts: 343
Likes: 4
From: Northwest
Unless you want lots of headaches DON'T use the holley 390 cfm carb, I did and had nothing but problems, researched it and so did everyone else, I bought the Edelbrock 500cfm carburetor, bolted it on and it ran great right out of the box!
Here's mine: Offenhauser dual plane intake, Edelbrock 500cfm carb, EFI split exhaust manifolds with dual exhaust, Pertronix ignition module and coil and a hilborn air cleaner. Next time I think I would opt for the open plenum manifold as the dual plane makes it's power down low and the open plenum makes it's power starting at mid range, the 300 has plenty of low end already and I found I needed higher RPM.
Here's mine: Offenhauser dual plane intake, Edelbrock 500cfm carb, EFI split exhaust manifolds with dual exhaust, Pertronix ignition module and coil and a hilborn air cleaner. Next time I think I would opt for the open plenum manifold as the dual plane makes it's power down low and the open plenum makes it's power starting at mid range, the 300 has plenty of low end already and I found I needed higher RPM.
Lead Driver
Joined: Jun 2006
Posts: 5,674
Likes: 995
From: Near Yosemite CA
The only problem I ran into putting the header in my 66 was NOT reading the instructions,,, "remove starter, when header is halfway installed, re-install starter" THAT is a handy piece of information right there! And no on the EFI manifolds, bolt on simple,,,
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Cool setup overlandexpress. It looks like we used a similar approach for the throttle linkage, although mine doesn't look nearly as pretty as yours. I have since cleaned up some of the wiring and gotten rid of all the gunk. I made the mistake of not painting my throttle bracket as soon as I cut it out.
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