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Old 07-28-2013, 03:06:33 AM   #91
rezajahanshahi
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Hi
Im going to change the 350 head with 305 head to increase compression ratio .
The combustion chamber on 350 head is 76cc
Which casting number and 305 head spec will be good for my application ?
Do I need to use double spring for valves ?
How I can modify ports ?
Pistons are 0.030 dish .
Following camshaft , intake and carb will be install on the engine :

http://www.summitracing.com/parts/edl-1411
http://www.summitracing.com/parts/edl-7101
http://www.summitracing.com/parts/edl-7102


Please give me advise for 305 head choice .
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Old 07-28-2013, 06:26:12 AM   #92
ls777z
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I believe 305 heads are very thin castings which means they don't take being overheated very well. Not to mention the air flow which isn't made for performance applications. Have you checked into an aftermarket steel head with a smaller combustion chamber ? They used to be fairly inexpensive, flowed better than a stock head, completely assembled and ready to bolt on.
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Old 07-28-2013, 02:50:19 PM   #93
rezajahanshahi
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Quote:
Originally Posted by ls777z
I believe 305 heads are very thin castings which means they don't take being overheated very well. Not to mention the air flow which isn't made for performance applications. Have you checked into an aftermarket steel head with a smaller combustion chamber ? They used to be fairly inexpensive, flowed better than a stock head, completely assembled and ready to bolt on.
Thanks for the reply
Unfortunately there is not a variety of cylinder head here in iran if I want to purchase after market cylinder head its going to very expensive .
Including shipping and I have to pay 3000$
305 heads are available here for 300$ so I prefer to go with 305 heads .
Combustion chamber volume of 305 is around 58 cc so the compression will be around 10:01
Exactly what I need .
Also by machining ports I can improve the flow.
I have heard this swap was really common old school.
But the casting number is important so before I go any further I can calculate the compression .
Looking forward for your good advice .
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Old 09-01-2013, 09:16:44 AM   #94
rezajahanshahi
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hi
good news :
holley double pumper 650 cfm on the way .
next step 4.1:1 ring and pinion .
recently i have checked my engine compression and it was 8.5 :1 for now its okey .
i have three choices for ring and pinion :
motive gear
summit
dorman
which product line produces reliable and noise free ring and pinion ?
many thanks
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Old 09-01-2013, 10:19:14 AM   #95
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Just now read through your thread. Look forward to seeing more. My dad currently lives in the ME so I'm somewhat familiar with that region of the world. I'll have to ask him if he's seen any American classics where he lives.
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Old 09-01-2013, 12:11:16 PM   #96
Rich Schmidt
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The factory 8.5:1 compression ratio is really 7.8:1. Good luck.
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Old 09-02-2013, 07:58:52 AM   #97
rezajahanshahi
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Quote:
Originally Posted by Rich Schmidt
The factory 8.5:1 compression ratio is really 7.8:1. Good luck.
hi
thanks for the tip
since the engine is 0.030 over bored and piston rings are oversized 0.40 and compressed to fit i think my reading is correct but i need to keep in mind may be some errors are possible .
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Old 12-09-2013, 05:25:06 AM   #98
rezajahanshahi
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Hi
Sorry for my absence I was really busy doing some inspection offshore
Holley 650 cfm carb already in place and the result was great
I have changed ring and pinion from 2.56 : 1 to 3.73 : 1 and it didnít work because of the gear box ratio so I change it to 3.07 good acceleration and good top speed
I have used the ring and pinion from a 1974 buik century auto trany whit good gears .
Now im going to do some modifications on the 305 cylinder head :
Port to 1.94
Polish
Upgrading the cooling water ports
Also im going to put 1.6 ratio rocker arms and I need some advice to choose the correct rocker arm brand and material .
Cam shaft already selected and it will have Advertised Duration 285/295, Lift .470/.470 and I hope the combination works well .
One more thing that I need your advise :
My mechanic told me when I ran holley carb I must change the stock fuel pump and use electric fuel pump,
is it true ????
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Old 12-09-2013, 08:23:20 AM   #99
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I recently asked a question about putting 1.6 rockers on my 84 Z that has the original 305. I was told that there would be a clearance issue with the push rods. As far as the fuel pump try it as is. If you run into a fuel starvation problem a high volume mechanical pump would probably be sufficient. Adding a Holley doesn't mean automatically that you need an electric pump.
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Old 12-09-2013, 02:58:16 PM   #100
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Old 12-10-2013, 03:08:09 AM   #101
rezajahanshahi
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Quote:
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Old 03-15-2014, 11:40:38 AM   #102
rezajahanshahi
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Hi
I have a question regarding intake manifold bolt pattern for square bore carburetors :
I have 650 cfm holley double pumper carburetor 4150 part number and its square bore for installing it on stock 350 intake manifold I had to use carburetor adaptor now im looking to purchase performance intake manifold ( 2500 – 6500 rpm ) together with cam shaft and etc .
If I buy square bore intake manifold do I need to use this adaptor ?
Reason I ask this question is because if need to use adaptor I may face some hood clearance issue .
Any suggestions for intake manifold ?
Many thanks .
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Old 03-16-2014, 09:42:01 AM   #103
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If your Holley carb is a square bore (meaning all four throttle blades are the same size) you don't need the adapter for square bore intake.
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Old 08-24-2014, 04:23:10 AM   #104
rezajahanshahi
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Hi
I was lucky to find a stock clutch kit from 38 years ago in a friend warehouse
Clutch disk diameter is 32 cm and its 4 pad graphite and I was told it was original for 1977 chevy trucks and blazer .
Im running 3 speed Saginaw with stock flywheel .
Before I purchase this kit I need to know 32 cm diameter clutch disk and pressure plate will fit to my 3 speed Saginaw tranny ?
Do I need to change flywheel as well ?
Many thanks
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