351 cam discussion
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Logistics Pro
Joined: Jul 2009
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From: Lansdale, PA
351 cam discussion
so im looking at buying a new cam, and im wanting to do a roller conversion, but i could care less if i do, as long as i can find a good flat tappet.
anyway, all i fojnd on here was the 35-255-5 and the 444232.....neither really interest me cause they are a little small for what i want to do later on
COMP Cams 35-255-5 - COMP Cams Computer-Controlled Camshafts - Overview - SummitRacing.com
Crane Cams 444232 - Crane CompuCam Cam and Lifter Kits - Overview - SummitRacing.com
i think summit has a minor typo because duration @ .050 on the comp is more on the intake but advertized duration on the crane is significantly better...so im assuming the ramprate on the crane is more exponential curve then linear, which would increase velocity (i think) im not happy with the lift of the crane either
what are the other cams that are compatible with efi
my plans are for a 393-408 stroker and mustang/lightning style edelbrock intake and possible boost.
lobe separation is only 111, why isnt this ok for efi
COMP Cams 35-243-4 - COMP Cams Xtreme 4x4 Camshafts - Overview - SummitRacing.com
anyway, all i fojnd on here was the 35-255-5 and the 444232.....neither really interest me cause they are a little small for what i want to do later on
COMP Cams 35-255-5 - COMP Cams Computer-Controlled Camshafts - Overview - SummitRacing.com
Crane Cams 444232 - Crane CompuCam Cam and Lifter Kits - Overview - SummitRacing.com
i think summit has a minor typo because duration @ .050 on the comp is more on the intake but advertized duration on the crane is significantly better...so im assuming the ramprate on the crane is more exponential curve then linear, which would increase velocity (i think) im not happy with the lift of the crane either
what are the other cams that are compatible with efi
my plans are for a 393-408 stroker and mustang/lightning style edelbrock intake and possible boost.
lobe separation is only 111, why isnt this ok for efi
COMP Cams 35-243-4 - COMP Cams Xtreme 4x4 Camshafts - Overview - SummitRacing.com
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Well if you're doing a stroker you'll be into either an aftermarket EFI system with built-in tuning abilities or a Ford MAF setup with a tuner added, and with those systems you can pretty much use any cam you want. But to pick the right cam for your truck you first need to nail down exactly what other parts you are using on and in the motor, what kind of powerband you want it to have, how the truck will be used, what trans, gearing, and tires it will have, and then you can pick a cam that will make the most of the combo.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
lobe separation is only 111, why isnt this ok for efi
COMP Cams 35-243-4 - COMP Cams Xtreme 4x4 Camshafts - Overview - SummitRacing.com
COMP Cams 35-243-4 - COMP Cams Xtreme 4x4 Camshafts - Overview - SummitRacing.com
Lead Driver
Joined: May 2011
Posts: 5,776
Likes: 443
The summit numbers aren't a typo. The comp has greater duration @.050, and is why I ultimately chose it. Would it make much difference? No. . .but I felt better choosing the more aggressive ramp rate and greater lift. Adding 1.7 rockers is somethin ill be doing also, so that pushed me toward the extra lift of the comp as well.
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Logistics Pro
Joined: Jul 2009
Posts: 3,635
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From: Lansdale, PA
The truck will have tuning... But not sure which setup yet. Either a maf conversion and e4od (original trans with punisher vb) or an eecv swap and 4r70w.
I realize I can use any cam, but for now I'm sticking with sd and 351. I have several motors I can build and have ready to swap into truck.
If it were a manual trans I'd just put megasquirt on it and do whatever I wanted.
I'm just trying to get some opinions on cams and ideas.
The heads will match the cam. Don't need to worry about that.
Truck is going to be a fun daily driver and a tow rig for my 67 mustang when my diesel is preoccupied. It will never go offroad enough to get muddy. Just down to the lake and winter snow fun.
Not the first efi truck I built, I just figured I'd throw the discussion out there to see others opinions.
I realize I can use any cam, but for now I'm sticking with sd and 351. I have several motors I can build and have ready to swap into truck.
If it were a manual trans I'd just put megasquirt on it and do whatever I wanted.
I'm just trying to get some opinions on cams and ideas.
The heads will match the cam. Don't need to worry about that.
Truck is going to be a fun daily driver and a tow rig for my 67 mustang when my diesel is preoccupied. It will never go offroad enough to get muddy. Just down to the lake and winter snow fun.
Not the first efi truck I built, I just figured I'd throw the discussion out there to see others opinions.
Lead Driver
Joined: May 2011
Posts: 5,776
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Well im overall pleased with my setup. Its 5x better than the 302 and im nowhere near finished, I have a CEL on and I don't have fuel press gauge or wideband hooked up yet so I have no idea what its doing. With that said, it runs out of steam at 3k which im thoroughly confident is due to the cel and tiny injectors. I don't expect it to be a twister by any means, butwith everything thorough ported I expect to play with it enough to get it to pull 4000-4500. Even as it sits now I wont be plagued with downshifts and is a joy to drive. It effortlessly lugs up hills at low rpm and the slightest pedal and can coax some wheel spin when I mash it just right (they're mud terrains). In a few weeks I will have it dialed in as good as it can be, which I think will be substantially better. I don't think the comp is doing much adjustment in relation to all the air I've added since the CEL has been on. Once I address that and get all my gauges hooked up ill be able to play around with it more
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Logistics Pro
Joined: Mar 2011
Posts: 4,197
Likes: 558
From: Central Wisconsin
Here's my thoughts, studies, and opinions on the subject...
The two cams that were first listed aren't very aggressive. Over factory yes a little more, but I don't think that sticking with an SD friendly cam is really worth the money for a cam that doesn't make much change.
The 3rd cam listed will work in the factory SD system. It's not going to idle worth a **** until it's warm though (after about 5 minutes or so). That's the downfall of SD. It won't compensate for the changes you make to the system. The tune port injection in chevy's are the same way. I helped my buddy build up a camaro with a 350 in it and the cam he got wasn't "supposed" to work with the TPI, but after it warms up it'll idle all day...Or at least it did. He only had the car for about 2 months and his girlfriend wrecked it.
All in all, I'm a fan of carbs. You can run whatever cams, heads, intakes, ect, that you want, and not worry about sensors compensating for whatever changes you make. You can tune it all by yourself, and you don't have to get a computer tuned to make it run every time you change motor parts around.
The two cams that were first listed aren't very aggressive. Over factory yes a little more, but I don't think that sticking with an SD friendly cam is really worth the money for a cam that doesn't make much change.
The 3rd cam listed will work in the factory SD system. It's not going to idle worth a **** until it's warm though (after about 5 minutes or so). That's the downfall of SD. It won't compensate for the changes you make to the system. The tune port injection in chevy's are the same way. I helped my buddy build up a camaro with a 350 in it and the cam he got wasn't "supposed" to work with the TPI, but after it warms up it'll idle all day...Or at least it did. He only had the car for about 2 months and his girlfriend wrecked it.
All in all, I'm a fan of carbs. You can run whatever cams, heads, intakes, ect, that you want, and not worry about sensors compensating for whatever changes you make. You can tune it all by yourself, and you don't have to get a computer tuned to make it run every time you change motor parts around.
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Logistics Pro
Joined: Jul 2009
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From: Lansdale, PA
For the cost of making it a carb engine, I can buy all the tuning software and hardware to tune the truck myself.
I'm not taking a step backwards here. If it were originally carbd I wouldn't care but being efi already it's halfway to where I want it already. I will continue getting parts and do one heck of an engine build soon.... Hopefully.
I'm not taking a step backwards here. If it were originally carbd I wouldn't care but being efi already it's halfway to where I want it already. I will continue getting parts and do one heck of an engine build soon.... Hopefully.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
No these cams aren't that agressive in the big scheme of things but they are significantly bigger and better then stock. When it comes to cams there is a lot more going on than lift and duration and in my experience a rather minor spec difference can make a very noticable difference in power output. Case in point the Crane 444232 is a real giant killer, I have looked at hundreds of cams and it's hard to find any that significantly outperform this one.. and thats with a stock or heavily moified motor. Yes there are some out there but you have to get quite radical to see more than just minor gains on any particular engine combo. Valve lift does seem to be a bit low with this cam but that's easily fixed with 1.7 rockers, that will get you 95% of the airflow capacity of any of the stock heads. And even though the advertised duration numbers would seem to suggest it's more of a high rpm cam it produces outstanding low rpm TQ in a 5.8 and pulls hard all the way to 5000rpm.. assuming the motor has enough head and intake to supply that engine speed.
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