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  #16 (permalink)  
Old 12-19-2012, 10:00 AM
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but i dont mind sinking some money and time into it as i think it would be kool to have a healthy working 305 because eveyone hates on them

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  #17 (permalink)  
Old 12-19-2012, 10:02 AM
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If you off road for recreation,it sounds like a good combo.If you race,then ?
If I wanted a v-8 off road car,I would use a 305. nice torque with the longer stroke,not bad fuel burn with low power and smaller displacement
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Old 12-19-2012, 10:08 AM
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its mostly just for recreation but at one of the local mud bogs they have drags nothing professional just more for fun...i dont plan on being a serious condender id just like to try it and have fun
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Old 12-19-2012, 10:16 AM
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You are talking through both sides of your mouth.
Seems as long as you don;t have to invest effort, its alll good. (porting your heads)
Do not use 1.6 valves on those heads on a 305. just 1.50' but the 1.94's will help (with porting)

You can simk all the money you want in it, but the poer of the 305 will be limited by the stock heads.
Money won;t fix that. But effort, will.
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Old 12-19-2012, 10:28 AM
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One good way to get a 305 to outperform a 350 is to supercharge it.
Needs air flow too. (DIY porting really helps)
a 142 blower is very very effective on a low compression 305.
A low compression ratio is one of the keys. ( (70++cc) large chamber 350 heads *1.94x 1.50 valves on a dished piston 305)

high perf engines make more power by increased air flow. Not by increased $$$ flow.
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Old 12-19-2012, 10:30 AM
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will i be alot better off with the 1.94 valves and porting with a farly mild cam as opposed to porting the stock 1.84 ? ive been doing lots of reading on porting the last couple days and i think im going to give it a try there really only is one way to learn
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Old 12-19-2012, 10:38 AM
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Quote:
Originally Posted by buggy305 View Post
will i be alot better off with the 1.94 valves and porting with a farly mild cam as opposed to porting the stock 1.84 ? ive been doing lots of reading on porting the last couple days and i think im going to give it a try there really only is one way to learn
Yup, now you are getting the picture. Find a old junk SBC head to practice a bit.

Porting with the stock 1.84" valve will improve flow for sure but porting + the larger 1.94" valve (with a new valve job) will make more flow, cause the valve is just bigger.

The 1.94x 1.60 valve combo is for a ported 305 head on a 350 motor.

The modded (cam etc) 305's power band is going to be much higher rpm than the stock motor.
It wants to rev. (Gears, converter) with 35" tires you will need some serious gears. It will be lame with the wrong gears.
A hot rodded 305 SBC becomes just as much as a high rever as a 302SBC is famous for. wants serious gears to perform/
The long stroke has nothing to do with it.

If your headers are "zoomies" convert/modify to a long tube style with collectors. ( more power/more torque)
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Old 12-19-2012, 10:47 AM
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343hp 305

look at the power band of this hot rodded 305. it wants to rev.
6000++rpm. needs serious gears.
your modded 305 is going to be much the same.
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Old 12-19-2012, 10:51 AM
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dyno

here is another one. This one has a big big cam in it but the idea is the same.
The power band is way up there. You got to rev it up. ( gears)

this is the nature of small cube hot rodded SBC's whether 283-302-305 or 307 or even a 327.
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Old 12-19-2012, 11:09 AM
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keys to making this work.

Finished compression ratio. (10:1 or as close as possible to it) Head milling. piston choice, gasket choice
head port flow (220++intake 160+ex cfm @28") generous real effort complete home porting+ larger 1.94" intake valve ans a good valve job) use a felpro 1205 as a guide and get serious with the die grinder, especially on the roof of the port and around the guide in the bowl. you need at least 1 long shaft carbide burr to get deep in the intake port.
cam (the cam yu got is good)
valve springs ( so it can rev)
RPM hi rise dual plane intake (power)
750carb (power)
gears (5.57 is just right for a 35" tire for this buggy)
converter 9" 10" 3000+ actual stall (3500+ advertized stall)
headers with a collector (power and torque)
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Old 12-19-2012, 11:14 AM
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thanks for sharing those articles and all your input i am going to go with the 1.94 valve then go at porting them im sure if i do lots of reaseach and put the time into it i will be happy with the results...one other quick question sence my motor is going to want to rev should i ditch the performer and move up to a performer rpm air gap intake ?
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Old 12-19-2012, 11:16 AM
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sorry didnt see your last post thank you
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Old 12-19-2012, 11:19 AM
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If you want it to be really different and unique build your self a set of 180 degree headers.
Google it.

Makes any V8 sound like a Ferrari V12. and makes great power too.
Your buggy chassis allows you to do this.
the primary pipes from cylinders #3, #5, and #4, and #6 cross over and join to the header collector on the opposite cylinder bank. The pipes do not need to be equal length.

Last edited by F-BIRD'88; 12-19-2012 at 11:29 AM.
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Old 12-19-2012, 11:20 AM
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Quote:
Originally Posted by buggy305 View Post
sorry didnt see your last post thank you
ya the RPM manifold is flat out a much better intake manifold.
worth the upgrade. The holley 300-36 is another good one.

Once the cylinder heads are nicely ported the motor likes extra valve lift.
So if you happen to trip over a set of 1.6 ratio SBC rockers, they will help.
.484" net lift with your cam. (don;t loose sleep over this)
(The push rod slot in the head needs to be extended a bit towards the rocker stud)

Last edited by F-BIRD'88; 12-19-2012 at 11:38 AM.
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Old 12-19-2012, 11:46 AM
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305 ho cam

After you finish the porting on your heads and deshrouding the 1.94 valves make sure the chambers are 58cc. With 58cc chambers and the .015 thick head gaskets your static compression will be 10.0 and with the Comp cam the DCR will be 8.3. Is there any way to run shorter tires to get the benefit of your 4.11 gears?
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