Inline 300 cam question.
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Inline 300 cam question.
Cross posted to Inline forum as well.
I have a 300/c6/3.25 gears
Offy DP and 4bbl carb
EFI exhaust manifolds
Before I start putting things back together (paint) I have great access to change the cam.
I know nothing about cams... I assume I can do a port and polish of the head later (easier access).
What would you suggest if I don't plan on anything else engine performance wise.
Comp Cam 252 or 260 have been mentioned before.
Truck use would be a driver, towing a small utility trailer rarely. Lowes, movie theater, car shows and back and forth to work occasionally.
I have a 300/c6/3.25 gears
Offy DP and 4bbl carb
EFI exhaust manifolds
Before I start putting things back together (paint) I have great access to change the cam.
I know nothing about cams... I assume I can do a port and polish of the head later (easier access).
What would you suggest if I don't plan on anything else engine performance wise.
Comp Cam 252 or 260 have been mentioned before.
Truck use would be a driver, towing a small utility trailer rarely. Lowes, movie theater, car shows and back and forth to work occasionally.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Just leave the cam as it is and drive it.
Porting and polishing the head will entertain you but will give you nothing in common driving. Nor will a hot rod cam unless you are going for a higher scale induction system and headers. And 3500+ rpm.
These motors are low speed long stroke luggers.
Porting and polishing the head will entertain you but will give you nothing in common driving. Nor will a hot rod cam unless you are going for a higher scale induction system and headers. And 3500+ rpm.
These motors are low speed long stroke luggers.
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
The 252 would be an excellent choice. The 260 is a little bigger, and would basically give it bigger lungs.
Either one would be an excellent choice. Especially with a good intake and dual exhaust.
I had a 260 in an otherwise stock 2barrel Cleveland motor, it ran very well and had a noticeable increase in torque and sounded better. Not real lopey at all, but you could tell something was there. My brother took that same engine and put it in his full size bronco. Runs great in that thing too.
For a 300 that doesn't turn high RPM, i would say that the 252 is probably a better choice for what your wanting.
Either one would be an excellent choice. Especially with a good intake and dual exhaust.
I had a 260 in an otherwise stock 2barrel Cleveland motor, it ran very well and had a noticeable increase in torque and sounded better. Not real lopey at all, but you could tell something was there. My brother took that same engine and put it in his full size bronco. Runs great in that thing too.
For a 300 that doesn't turn high RPM, i would say that the 252 is probably a better choice for what your wanting.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
I had the same basic setup with the 260 cam and didn't like it. You loose some of the low end grunt that is the main reason for having a six to start with.
I did port the head on a different 300 once and it made a huge difference through the whole power band with everything else stock.
I think the best cam is the stock one for low end and fuel consumption. I think it's Isky who makes one called Mile-a-More that is supposed to also be good.
I did port the head on a different 300 once and it made a huge difference through the whole power band with everything else stock.
I think the best cam is the stock one for low end and fuel consumption. I think it's Isky who makes one called Mile-a-More that is supposed to also be good.
Laughing Gas
Joined: Dec 2005
Posts: 904
Likes: 115
From: Laurel, MS
I didn't do anything fancy - just ground down the thermactor bumps in the exhaust ports and smoothed the transition to the EFI exhaust manifolds... made a HUGE difference.
Just be sure to wear good eye protection. I had to go have bits of metal dug out of both eyes (with a needle and very small dremel-like tool) in spite of having on safety glasses. Now, when I port heads I wear safety goggles AND a face shield.
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Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
The 252 would be an excellent choice. The 260 is a little bigger, and would basically give it bigger lungs.
Either one would be an excellent choice. Especially with a good intake and dual exhaust.
I had a 260 in an otherwise stock 2barrel Cleveland motor, it ran very well and had a noticeable increase in torque and sounded better. Not real lopey at all, but you could tell something was there. My brother took that same engine and put it in his full size bronco. Runs great in that thing too.
For a 300 that doesn't turn high RPM, i would say that the 252 is probably a better choice for what your wanting.
Either one would be an excellent choice. Especially with a good intake and dual exhaust.
I had a 260 in an otherwise stock 2barrel Cleveland motor, it ran very well and had a noticeable increase in torque and sounded better. Not real lopey at all, but you could tell something was there. My brother took that same engine and put it in his full size bronco. Runs great in that thing too.
For a 300 that doesn't turn high RPM, i would say that the 252 is probably a better choice for what your wanting.
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Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Run it stock, build another hotter engine to drop in. The best 300 I built was with 360 pistons, and a mid range torque grind from Delta, but stock intake and exhaust. CR around 9:1. Craziest I built was with small chamber pistons, and a 240 head. It turned out about 10.5:1, along with an Offenhauser C and a Motorcraft 2150 carb. It had the EFI duals, and I ported the head out as far as I dared. It was a beast, but thirsty, and required premium.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Then I would keep it stock, other than maybe the clean up head porting. My 300 with efi exhaust, 260 cam, Offy C and 390 Holley never got better than 12, a number any 460 can muster and you could never make a 300 pull with a 460.
Cargo Master
Joined: Feb 2003
Posts: 2,341
Likes: 5
From: Sacramento
I agree.
240 head and swap to GM 292 rockers. Simple and effective. I have a 274 cam, and it comes to life at 2k. It's still decent in town, even with highway gears. The lope gets annoying to drive with in traffic, but sounds too kool to put in a smaller cam.
240 head and swap to GM 292 rockers. Simple and effective. I have a 274 cam, and it comes to life at 2k. It's still decent in town, even with highway gears. The lope gets annoying to drive with in traffic, but sounds too kool to put in a smaller cam.
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