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Old 04-29-2010, 09:40 PM
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How to build a 350?

I'm looking to build a 350 for my 3/4 ton 4x4. It will have a 4 speed ans sit on 36 inch tires. What cam and intake should I use for a good lowend motor? I'm on a budget so throw out some options for me please. I will have headers and flowmaster 2 1/2'' cener in/out super 44's.

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Old 04-30-2010, 07:10 AM
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Quote:
Originally Posted by Dirty Chevy
I'm looking to build a 350 for my 3/4 ton 4x4. It will have a 4 speed ans sit on 36 inch tires. What cam and intake should I use for a good lowend motor? I'm on a budget so throw out some options for me please. I will have headers and flowmaster 2 1/2'' cener in/out super 44's.
For good midrange get a cam with about a 210/214 duration at .050", used RPM intake, used Edelbrock 600, flat top pistons, and 76cc heads. Could probably build it all for less than a grand if you're real careful.
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Old 04-30-2010, 09:32 AM
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what AP said sounds good, the only thing i would change of corse would be the 76cc head, and yes i'll say it for some vortecs, or double humps but this will cost you a few more hundred bucks, but i think it would be worth it
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Old 04-30-2010, 10:56 AM
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Originally Posted by my87Z
what AP said sounds good, the only thing i would change of corse would be the 76cc head, and yes i'll say it for some vortecs, or double humps but this will cost you a few more hundred bucks, but i think it would be worth it

That'll raise his compression to 10:1+ even with 93 octane that could be a problem with a high load application. 76cc heads would allow you to run pump fuel with no worries.
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Old 04-30-2010, 12:38 PM
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Quote:
Originally Posted by ap72
That'll raise his compression to 10:1+ even with 93 octane that could be a problem with a high load application. 76cc heads would allow you to run pump fuel with no worries.
sorry i wasnt implying that he would use the falt tops with the 64cc vortecs, he would end up needing to go with a dished piston,i figured you guys understood that. but it's my fault i didnt clarify that

there aren't too many 76cc heads out there i that i would ever used if i were even just rebuilding a motor, i would always pay the extra few hundred for some vortecs for the added power. if i didn't i would regret it until i went a head and made the change
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Old 04-30-2010, 03:40 PM
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Is this a weekend toy or your main ride? What gears are you running and which 4 speed? I'm guessing 3.73's and an SM 465...... ????? Your intended usage and drivetrain will greatly impact your compression, cylinder head, intake and cam choices.

With 36's at 55 on the highway you'd be turning about 1900 RPM. OK in a nice light car or lowered 2WD truck in Kansas but in a lifted 3/4 Ton in Oregon not so much.. You'll have your foot planted in it all the time just to keep up with traffic if you go too big on the cam, heads, etc.

Also, are you using a 2 Pc. rear main 350 or a later 1 Pc. rear main block? If you don't have the 350 already hunt down a later 1 Pc. rear so you can run a factory roller cam setup. GM made a great little roller cam for low and mid range torque. They used it in the 305 and 350 Marine engines, the Ramjet 350 and HT383. It doesn't look real impressive on paper but it works really well. The last three numbers of the PN are 395.

Personally, I would find a low mile 350 Vortec, slip in the '395 cam with a Performer intake, Q-Jet 4 bbl. and headers and call it good. Even the stock Vortec cam is a good TQ cam but it doesn't have a lobe for a mechanical fuel pump so you'd have to run an electric pump. Some late SBC's are machined for a mechanical fuel pump and some aren't but so far every one I've had my hands on has been.
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Old 05-01-2010, 02:19 PM
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Thank you all for your input. Its an old four bolt main from a 75-77. Im still trying to learn about cams and heads. I was thinking a wiend intake and trick flow cam Duration 266/272, Lift .440/.454
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Old 05-01-2010, 02:43 PM
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Quote:
Originally Posted by Dirty Chevy
I'm looking to build a 350 for my 3/4 ton 4x4. It will have a 4 speed ans sit on 36 inch tires. What cam and intake should I use for a good lowend motor? I'm on a budget so throw out some options for me please. I will have headers and flowmaster 2 1/2'' cener in/out super 44's.
That's similar to what I had, except I had a 1/2 ton and had a T350 instead of a 4sp.

'83 Chevy 1/2ton 4X4 (4" superlift, "33 BFG all-terrain)
350 4bolt (.030-over), "441" heads, CompCams 260H, stock Qjet intake, holley 600cfm (w/adapter), hedman 1-5/8, flowmaster 2-1/4 ex., stock HEI w/accel coil, stock converter/trans.

Worked awesome. Engine had lots of torque, reliable, good on/off road. Dirty, keep it simple since you're on a budget, and especially if this is gonna be your daily driver.
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