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Old 03-30-2010, 03:25 AM
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cam for 305 ho

Hi I have a a set of 53cc 305 heads with 2.02 valves I plan to put on my 305 in an 87 blazer.I would like to know what would be a proper cam to go in this engine.It will just be a daily driver not for racing.I just want something with pep and good low end response.
Scotty

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Old 03-30-2010, 03:51 AM
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The 2.02" valve won't clear the bore on a 305 unless the lift is really tiny, this valve size is not recommended.
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Old 03-30-2010, 06:33 PM
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Agree The 305 head does not need or work well with a 2.02 intake valve.

The chamber of the 53cc 305 heads is way way too shrouded for a 2.02 valve to be of any good. Unless the chamber is properly modified the 2.02's valve is not going to work.
If the head is to be used on a 305 that still has the stock cylinder bore size then limit the valve lift to .450" or less. Its up to you to check the valve edge cylinder bore clearance at full valve lift.

A `53cc chamber 305 head that started out at 53cc will no longer be 53cc when a 2.02 valve is fitted, unless it was shaved to restore the chamber volume.

A 58cc chamber 305 head will no longer be 58cc when a larger valve is fitted.
When i do them with 1.94x 1.50 or 1.94 x 1.60 valves and lots of porting (for budget perf 350 applications or 305`s that have been bored oversize) They typically end up 61-62cc.

You`ll find may ebay 305 heads for sale offered with 2.02 valves.
Thats because they are easy to sell to inexperienced guys dazzled by big 2.02 valves.
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Old 03-30-2010, 09:17 PM
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Shaved

The heads have been shaved at a machine shop back to 53 cc.So far the motor runs real strong but I still have a stock cam.I just want something I could put in it to give me that good lopeing sound.I also have a set of 58 cc 305 ho heads that have a little camel hump symbol on them would they be better on this engine ?
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Old 03-31-2010, 04:35 PM
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Quote:
Originally Posted by Imaginos
The heads have been shaved at a machine shop back to 53 cc.So far the motor runs real strong but I still have a stock cam.I just want something I could put in it to give me that good lopeing sound.I also have a set of 58 cc 305 ho heads that have a little camel hump symbol on them would they be better on this engine ?

use isky can #201268. Degree it in advanced on a 100-102 intake C/L
( these cams work best when correctly intstalled.

it has a rough street machine idle. Needs some rear gear ratio and a high stall converter. Get a converter with a advertised stall of 3000 or higher.

You must recurve the distributor advance curve.

I prefer the 416 305 heads They can be flat milled down to 52cc also if thats what you need.

Either way with either of the 305 heads they work best with lots and lots of porting. Just installiing large valves is only half the job.

This cam has .450" valve lift. The gas mileage will not be spectacular.

www.iskycams.com

Last edited by F-BIRD'88; 03-31-2010 at 04:48 PM.
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Old 03-31-2010, 11:51 PM
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