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5.7 350 Camshaft

1231 Views 29 Replies 9 Participants Last post by  gmorin07
I’ve read people running a LT1 cam in there 5.7’s so I looked and is this the cam they are talking about?


Thank You
Glenn
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Well I’ve been looking and reading and I saw this cam and thought I would ask about it.
I have never heard of the hot cam… I’m doing carborated so which cam you think would be best? LT1 or Hot Cam?
I have heard that a couple times now.
Oh my god… I love auto correct!
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As mentioned above, makes 330HP with decent heads. If it's an old TBI truck motor you'll need to put on Vortec or at least TPI heads for those numbers. The Corvette ones were aluminum. It's more the heads that made the LT1 and LT4 hotter engines, but they won't work on any other SBC because of the reverse waterflow in the LT1/4 blocks. Not talking about water pumps, the whole engine was reverse water flow. While still using the basic SBC rotating assembly and roller lifter valvetrain.
If your engine has a flat tappet cam these cams won't work unless the block has the proper machining for a roller cam and lifters. The distributor gear must also be for a roller camshaft or the cam will eat a non melonized gear quickly. Those cams do have a fuel pump lobe but you'll need a block that is roller ready and drilled for a fuel pump. I believe some 638 blocks have both. Some were even 4 bolt. Great base for a stroker 383 or 406.
If it's not roller ready call Summit and ask what flat tappet cam will work best for your intended use.
I believe I have a roller cam currently…
I built a couple with LT4 cams, definite improvement over stock but not radical.
Just keep in mind that computers don't like big cams.
I’m running a 91 and carbureted
In 1991, most 350 engines out of cars were roller cam engines. Truck engines were all flat tappet cams, but a lot of the blocks had the valley pedestals drilled and tapped for the roller lifter retainer and the front of the block machined and tapped for the roller cam retainer plate. So in most cases, not all, it is easy to upgrade to the lt4 cam with the needed lifters. A lot of those blocks, tho, did not have the fuel pump area drilled for a mechanical pump. So an electric pump and pressure regulator is needed. I believe GM did it that way so the bare blocks could be used to build any 350 in the factory and since nothing had mechanical pumps they skipped that machining step.
Your carb obviously isn't original.
Ok I think I’ll be better off getting a mild cam then lol.
Any suggestions on cam for street use? Weekend warrior, 350 vortec with dual plane intake, 650cfm carb and Sanderson shorty headers?
Thanks
Glenn
Yes, that cam has skyrocketed in price in recent years, maybe due to popularity idk. Here's a screenshot of a summit invoice from March 2015 on my original 383 build, never used the cam but look at the price new $219. $547 is highway robbery. View attachment 368903
I’d say so lol
Don't order any cam until you absolutely verify which lifters you have.
The easiest way to do this would be to remove a valve cover and one pushrod. Count the turns as you loosen the rocker arm and retighten exactly the same amount will save needing to adjust that valve when you reinstall the pushrod. Stick a borescope down the hole and look at the lifters. You can get one for your phone on ebay for under $10.
You won't be able to see the bottom of the lifter but will be able to see if there are roller lifter retainers or not.
The tin spider and the figure 8 shaped retainers around the lifters will not be there with a flat tappet cam.
View attachment 368904
It’s 100% roller cam.
Glenn
Call Summit and tell them what you are looking for. They have tech help for picking the right cam. And a lot of roller cam choices for under $500. Some around $200.
Ok I will definitely do that and I’m going to talk to comp cams tomorrow
Yea so motor is a 80s 5.7 so not a vortec engine but putting vortec heads on it. Sorry for the misinformation before.
You're going to have a blast when cold weather hits...Vortecs have no heat crossover and will make the engine cold natured until it's nice and warm. Make sure your choke is working and adjusted properly.
I live in North Carolina and have a daily so no worries there.
I think I have landed on the one I want a Comp Xtreme Energy 268H Hydraulic Flat Tappet Camshaft & Lifter Kit Lift: .477" /.480" Duration: 268°/280° RPM Range: 1600-5800
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