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Old 06-22-2010, 11:45 PM
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305 Combo what do you think?

Rotating assembly
http://www.summitracing.com/parts/ES...1030/?rtype=10

Heads
http://www.summitracing.com/parts/NAL-12558060/

intake
http://www.summitracing.com/parts/EDL-7116/

Camshaft
http://www.summitracing.com/parts/EDL-7102/

Rockers
http://www.summitracing.com/parts/SUM-G6905/

Timing chain gear
http://www.summitracing.com/parts/EDL-7802/

Pushrods
http://www.summitracing.com/parts/TFS-21407050/

Point something out if you see something that your would change. This is just something i made up i might use. maybe even with a 350 rotating assembly.

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Old 06-23-2010, 01:08 AM
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Why invest this much money in a 305?
What do you plan to do with it to need those rods and crank?
A Vortec 350 with a stock bottom end would handle that cam just fine.
Vortec heads on a small bore 305 isn`t a good idea either. The valves will overhang the bore causing bore shrouding and possible valve contact with the deck. The larger 64cc chamber with the given pistons will give you a compression ratio in the low 8:1 range which won`t work real well with that much cam. Not putting you down here, but I think you should spend more time learning about performance before coming up with combo`s like this where you`ll waste alot of money on pieces that won`t help power any.
Performance is all about matching up the combo, with a 305 you have a small bore working against you.

Last edited by DoubleVision; 06-23-2010 at 01:21 AM.
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Old 06-23-2010, 07:10 AM
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Really trying to wrap my brain around this obsession with the boat anchor that is the 305. I just don't get it.
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Old 06-23-2010, 07:15 AM
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if you really want to spend all that money build a 383 and you wont spend to much more money if you look alittle bit for parts and a good 350 block to bore out its your money thoe
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Old 06-23-2010, 11:43 AM
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It was just something i was putting together probly not going to put that in the 305 looking for a 350 block for that but idk why i put the 305 Rotating assembly on there what do you think about that combo in a 350?
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Old 06-23-2010, 08:05 PM
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you need 9.75 to 10:25:1 cr with than cam. I would use 10:1.

need a 3.73 to 4.11 gear and a 2800 to 3000 stall.

forget the 305.

I would start with a complete 350 vortec engine with a factory roller cam. You can get those for $500.00. Rebuild it for $1000.00, modify the heads to allow more lift, add a bigger roller cam, reuse the stock rockers and push rods, add a rpm intake with a holley 750 3310.
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Old 06-24-2010, 12:03 AM
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Quote:
Originally Posted by 454C10
you need 9.75 to 10:25:1 cr with than cam. I would use 10:1.

need a 3.73 to 4.11 gear and a 2800 to 3000 stall.

forget the 305.

I would start with a complete 350 vortec engine with a factory roller cam. You can get those for $500.00. Rebuild it for $1000.00, modify the heads to allow more lift, add a bigger roller cam, reuse the stock rockers and push rods, add a rpm intake with a holley 750 3310.
Well I have a 305 in my 86 c-10 and the most ive spent on the motor and plan on spending was headers carb and intake. I would never spend lots of money internally on a 305. Get you some 3.73 gears and keep rolling
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Old 06-24-2010, 01:23 PM
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a lot of this has been mentioned, but not all in one place:

Those heads will bolt onto a 305 and the valves will clear, but the chambers are too large for the 305 unless you're planning on running boost of some sort (you'll end up with right around 8:1 compression if not lower).

A 350 with those heads and similar pistons will probably still be on the low side compression wise for that cam.

The cam has too much lift for the heads, you'll need to get the guides machined down, new springs and possibly other matching parts to deal with lifts over .470". That's a big cam in general, hopefully whatever it's going in is light and has tons of gear/big stall converter, otherwise it will be very unhappy.

That big a cam I'd probably consider a single plane intake and compression in the 11:1 range.

I don't believe that those pushrods are the right length for any SBC combination.

I get building a 305 if that's what you want, but this combination isn't going to work, and even if make changes to make it bolt together and turn over, I can't imagine what you'd put it in that this would be happy.

What is it going in? What does the rest of the drivetrain/chassis look like? What's the intended use?
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Old 06-24-2010, 01:43 PM
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Quote:
Originally Posted by goldenbullet44
It was just something i was putting together probly not going to put that in the 305 looking for a 350 block for that but idk why i put the 305 Rotating assembly on there what do you think about that combo in a 350?
A 350 block should be high on your list of priorities, IMHO. If you scored a L31 Vortec, you'd already have the heads and w/nothing more than a valve job you'd be about where you'd be w/the heads you linked to.

Vortec heads require self-aligning rocker arms, the linked-to rockers are not SA.

As mentioned, 7.050" push rods will not fit a SBC engine, you'll want a p-rod in the area of 7.8" for a FT cam and lifters. An OEM roller cam and lifters use a ~7.2" p-rod. The exact length cannot be known until the engine is mocked up and measured.

You've already gotten some advise regarding that cam, you should tone it down unless you're going for the fence. Definitely out, AFA using it w/a 305, unless you were to get some heads done especially for a small bore. Just not cost-effective, IMO.
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Old 06-24-2010, 01:55 PM
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If you'd like to do a bit o' reading, a lot of info on Vortec heads and mods to them, etc. is HERE.
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Old 06-24-2010, 05:48 PM
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This engine will be going in a 1985 Pontiac trans am t top car T-5 borg warner 5 speed
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Old 06-24-2010, 06:19 PM
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you know they make vortec 305's right? just go to a yard and get a set of heads. the 305 rotating assembly is the same as a 350, just balanced different. i've seen 305's peak the 400hp mark, but no more.

*ported set of 305 vortec heads with the small chamber
*higher comp like 454c10 said
*roller rockers (i like harland sharp and scorpion. really nice pieces)
*victor jr intake for vortecs
*650 carb
*Cam selection is key! I would almost go solid roller if you can.
*lt1 rods (factory proven for 450 hp and almost 7500 rpm)
*forged crank

the point is to put as much torque as HIGH as possible. you will need to wind the crap out if to get that power, but you can do it, it has been done. search the web for 400 hp 305. well actually, here:
http://www.hioutput.com/tech/400hp/400hp.html
they're using a slightly different recipe, but it is proven.

I applaude the fact that your trying something different. Don't let anyone change the way you think. It's your car, do it the way you want it. Cheaper power than a 350, no. But, kicking a mild 350's butt with a 305 is worthy of an award.

Last edited by cusz28; 06-24-2010 at 06:28 PM.
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Old 06-24-2010, 08:32 PM
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heh, an '85 T5... everything we're talking about will destroy that tranny, and then the rear axle will go right after that...

Quote:
Originally Posted by cusz28
you know they make vortec 305's right? just go to a yard and get a set of heads. the 305 rotating assembly is the same as a 350, just balanced different. i've seen 305's peak the 400hp mark, but no more.
there's some weirdness there... '87 and up 350 and 305 cranks have the same PN, but they have different counter weights...

Quote:
*ported set of 305 vortec heads with the small chamber
*higher comp like 454c10 said
*roller rockers (i like harland sharp and scorpion. really nice pieces)
Scorpion

Quote:
*victor jr intake for vortecs
*650 carb
*Cam selection is key! I would almost go solid roller if you can.
*lt1 rods (factory proven for 450 hp and almost 7500 rpm)
The later LT1 rods (powdered metal ones) are the good ones that replaced the "pink" rods in the GMPP catalog and are stronger and cheaper.
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Old 06-25-2010, 01:12 AM
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305 Vortec heads are swirl ports and don`t flow no where near L31 vortecs do. I don`t get it, How hard can it be to get some books and learn hot rodding instead of trying to short cut it by picking various parts then asking if it`ll work? When you know your trade you won`t have to ask.
One thing I can tell you right now, flow is power, but, when the combo don`t match your wasting your time, the only people you`ll make happy is the people your ordering it from. You get out on the track with a combo you think will take it all only to get your doors blown off by a stock vehicle.
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Old 06-25-2010, 03:33 AM
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Quote:
Originally Posted by DoubleVision
I don`t get it, How hard can it be to get some books and learn hot rodding instead of trying to short cut it by picking various parts then asking if it`ll work?
They don't teach that in school anymore. 3+3=7. Good job Johnny, you're trying. It is the deliberate and unceasing dumbing down of America.

I was talking with the manager of a food store the other day. He said he has to coddle the little beggars to death to get anything out of them. Said he has to constantly praise them because that's what they are used to from school.
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