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Old 12-14-2006, 03:44 PM
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cam selection

what kind of cam would be best for n/a 8.5:1 350 with ported heads,port matched dual plane,and a 750hp holley?manual trans,big headers,4.56 gears. i want a chopy idle and vaccum isnt really important.all i have in mind is power!!!

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Old 12-14-2006, 06:26 PM
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Comp Cams 12-230-2 (206-212 @ .050 lift) if the engine is only 8.5:1... anything bigger and the only thing you'll be able to pass with authority is one of them hybrid cars even with the deep gears you have.
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Old 12-14-2006, 08:08 PM
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You need less gear.4.56 would be horrible to drive with a 8.5:1 350.My 72 C30 originally came with a 402bbc;TH400 trans;and a 4.10 posi rear.And 65mph was 3600rpm.
1rst: what kind of vehicle is this?
2nd:Which manual trans is it?
in my opinion this is what I would do:
1.Raise the compression.At 8.5:1 thats basically a stock 350.anywhere between 9.5:1-10.25:1 should work good with pump gas.Also you'll never be able to see the full potential with raising compression.
2.Change the gearing:a 3.73 would be o.k
3.You dont really need a 750cfm holley unless you see The high end of the rpm range constantly.a 625cfm-650cfm is more than plenty for a 350.And will be more driveable,probably deliver more power/mileage,And probably less tuning issues.
4.If you're driving this engine on the street.I would personally use a smaller pipe size(2.25"-2.50"),Or 1 5/8 primaries headers.It will run better on the low end-mid range.
So raise the comression,Put lighter gears in the rear.Change the carb to a smaller one.And then I would suggest either the
12-242-2 268H xtreme energy cam or
12-246-2 274H xtreme energy cam(Remember if you want you can change the cam to a bigger one later.See how the smaller one performs.You might like it.)
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Old 12-14-2006, 08:28 PM
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get ur heads milled, or better yet get some new aftermarket ones then u can run a big cam
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Old 12-14-2006, 08:33 PM
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Vortecs are nice.But if you dont want to change intakes.Dart 180 or 195s are fair priced.What heads are currently on the motor?
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Old 12-14-2006, 08:57 PM
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cam

the tranny is a 5 speed with a .67 5th gear.the heads a ported 462624 gm 76cc.i have stock flat top 4vr -6cc pistons right now.going to get heads and big cam later,, just wanted to know the best cam to run for know.i have two laying around but which is better?crane energizer hyd[260 adv-.440 lift]or comp cams hyd[268 adv-.454 lift]i will probly go with the comp for now cause its a little bigger.i had BUILT 10.9:1 355 with a .525 solid cam in the car and the hp 750 dp and it ran great on the street with the 4.56 and a 26/10.50 et street.5th gear at 60 was only in the 2500-2800 range.
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Old 12-14-2006, 09:09 PM
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depends on preference
but to me bigger is better
whats duration at .050? also most people prefer comp cams
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Old 12-14-2006, 09:19 PM
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That .67 gear will drop the rpm a lot.I would go with the 268H comp cam.I've used it before in a daily driver 350.And it worked great.
The only thing Im saying with the carb is it will run.But a smaller one would be a lot more efficient.You will find a lot of the time that bigger does'nt always mean better.When I was younger I started out putting a 750cfm holley on my 350chevy and had lots of tuning troubles.Till I went smaller with the carb.I went to a 600cfm edelbrock and it ran a lot better.I like both holleys and edelbrocks.
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Old 12-14-2006, 09:23 PM
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Bigger is not always better. Find yourself a set of 64cc heads if you even want to think about running a decent sized cam and still have any kind of performance out of it.
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Old 12-14-2006, 09:24 PM
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cam

the 750 im sure is to big for this very mild 350 but i will just jet it down for now.i just need the motor to run good for a little while till i get to bump up the cr and the bumpstick.i am hopeing for a moderate 300 ponies for now of course.thanks for the help yall
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