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Old 05-27-2017, 08:41 PM   #1
SilverMachine
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mild 350 build what to expect?

Hey guys, doing a mild 350 build here and was wondering what to expect
This is going to be my daily driver, but i want some oomph if i feel like it.
i have a performer intake and an edlebrock 1406 600cfm carb. Im planning on going with some vortec heads 170cc intake w/64cc combustion chambers. The cam im looking at is the comp xe262H: Duration @ 0.006": 262 / 270 Duration @ 0.050": 218 / 224
Max Lift w/ 1.5RR: .462" / .469" Lobe Separation: 110
Lobe ID#'s: 5442 / 5201

i was just wondering what to expect/thoughts on this set up. Thanks!
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Old 05-27-2017, 08:50 PM   #2
Warrens69GMC
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Re: mild 350 build what to expect?

is the performer for the vortec heads?

if not, these are your better bet-
http://www.ebay.com/itm/CHEVROLET-VO...sAAOSwD0lUkv5d

Read here-
http://www.superchevy.com/how-to/eng...-sledgehammer/
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Old 05-27-2017, 08:52 PM   #3
SilverMachine
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Re: mild 350 build what to expect?

yeah it is. i think its the Edlebrock350-2116
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Old 05-27-2017, 09:43 PM   #4
Warrens69GMC
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Re: mild 350 build what to expect?

should sound nice and have plenty of power

https://www.youtube.com/watch?v=8YW4tj_hg8Y
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Old 05-27-2017, 10:08 PM   #5
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Re: mild 350 build what to expect?

about 11 mpg also
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Old 05-28-2017, 10:48 AM   #6
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Thumbs up Re: mild 350 build what to expect?

my engine is not exactly like yours but it is a similar setup. I have the Comp HE260 with a Performer RPM intake, Quadrajet, and long tube headers. it sounds good at idle although the 262 does more agressive. I can tell you from being happy with my setup that you will be very happy with yours.

are you starting from nothing as in no engine and buying parts to build one or are you rebuilding an engine?
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Old 05-29-2017, 08:04 PM   #7
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Re: mild 350 build what to expect?

A lot of people say that a Quadrajet is better for street use, better mpg, more reliable and make just as much horsepower. On my 350 I have an 800 CFM Quadrajet with electric choke.

You probably know, but the Vortec heads require a coolant bypass and widening of coolant channels etc when used on a Gen1 350 block. Have you read up on what your plans are there?
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Old 05-29-2017, 08:14 PM   #8
LukeC10
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Re: mild 350 build what to expect?

Quote:
Originally Posted by SilverMachine View Post
Hey guys, doing a mild 350 build here and was wondering what to expect
This is going to be my daily driver, but i want some oomph if i feel like it.
i have a performer intake and an edlebrock 1406 600cfm carb. Im planning on going with some vortec heads 170cc intake w/64cc combustion chambers. The cam im looking at is the comp xe262H: Duration @ 0.006": 262 / 270 Duration @ 0.050": 218 / 224
Max Lift w/ 1.5RR: .462" / .469" Lobe Separation: 110
Lobe ID#'s: 5442 / 5201

i was just wondering what to expect/thoughts on this set up. Thanks!
Search about stock vortec heads max lift, some guys say even your cam would be too aggressive for them - at the very least most guys seem to suggest you'd be right on the edge and would have to measure your actual set of heads to see if you can even run that lift. That said if you want to run an aggressive cam you can have the heads machined or do it yourself with the comp cams cutting tool, but no idea on how reliable that is.
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Old 05-30-2017, 07:31 PM   #9
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Re: mild 350 build what to expect?

Quote:
Originally Posted by LukeC10 View Post
Search about stock vortec heads max lift, some guys say even your cam would be too aggressive for them - at the very least most guys seem to suggest you'd be right on the edge and would have to measure your actual set of heads to see if you can even run that lift. That said if you want to run an aggressive cam you can have the heads machined or do it yourself with the comp cams cutting tool, but no idea on how reliable that is.
He's far from the limit of stock vortecs. GM runs them at higher lifts from the factory on ramjets for crying out loud.

You should expect a great all around engine with that combo OP.
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Old 05-30-2017, 08:19 PM   #10
LukeC10
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Re: mild 350 build what to expect?

Quote:
Originally Posted by Tom View Post
He's far from the limit of stock vortecs. GM runs them at higher lifts from the factory on ramjets for crying out loud.

You should expect a great all around engine with that combo OP.
This article says .420 is max lift: "Because these heads are meant to work with a 1.5:1 rocker, their tall valve guides can only handle maximum valve lifts of around 0.420 inch."

http://www.superchevy.com/how-to/148...ds-valve-lift/

Btw, is this the engine your talking about -running .460 lift on iron vortecs? Would assume they have machined those heads for that money.

http://www.chevrolet.com/performance...ck-ram-jet-350

Last edited by LukeC10; 05-30-2017 at 08:27 PM.
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Old 06-01-2017, 03:34 PM   #11
Tom
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Re: mild 350 build what to expect?

The ramjet has .481" lift on the exhaust. .420" lift is the factory spec for a 96-98 vortec truck camshaft, not the limit of the head. That article is just plain wrong.
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Old 06-01-2017, 04:38 PM   #12
LukeC10
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Re: mild 350 build what to expect?

Quote:
Originally Posted by Tom View Post
The ramjet has .481" lift on the exhaust. .420" lift is the factory spec for a 96-98 vortec truck camshaft, not the limit of the head. That article is just plain wrong.
Tom were not sure what the Ram Jet specs are - the head part# they list is for a bare head - so it may be machined, they may be using non-standard springs and retainers to compensate, or at the very least they are measuring the clearance on each head to be safe you would hope, but who knows, chevy performance has a lot of wonky engine cam combinations that are a very bad idea like the 350/290. If those are truly stock Vortecs with standard springs etc it would be really interesting though for sure.

Here is another article with pictures of actual head measurements - so this particular vortec they have their hands on cannnot handle more than a .420 lift;

"The stock Vortec iron head will not tolerate more than 0.440-inch lift. We measured our stock iron heads right out of the box and the retainer-to-seal clearance was only 0.470-inch. Subtract the standard 0.050-inch clearance, this leaves only enough room for a 0.420-inch lift cam. "

http://www.powerperformancenews.com/...benchtop-mods/
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