96 chevy 305 vortec heads on 350 block - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-13-2002, 06:37 PM
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Question 96 chevy 305 vortec heads on 350 block

I have a 96 chevy pickup with a 305 vortec engine which has about 200,000 miles on it. I was wanting to put a 350 vortec block bored .30 over in it and I was wondering if my stock 305 heads would work or do I need to but a set of 350 heads. Also does anyone know if I can use my 305 intake on the 350 block? Any help would be appreciated. Thanks

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Old 11-13-2002, 06:59 PM
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you can use the 305 heads on the 350 block but you will increase compression as the 305 heads have a smaller comb. chamber, intake will fit also. if you are going to build the 350 from scratch with a new bore job,pistons are available for 305 heads on a 350, the rebuilders can't find good 350 cores(they are usually cracked) so the piston companies are making pistons for your combo in all oversizes.
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Old 11-13-2002, 07:18 PM
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Thanks, should I go with 350 heads due to the increased compression, or will it be ok.
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Old 11-13-2002, 07:23 PM
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you can use the 305's just be careful about spark knock, use good gas when makin the old truck work.
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Old 11-13-2002, 07:29 PM
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Thanks again for replying, this is a everyday work truck for me, so I probably should be on the safe side and go with the 350 heads huh.
Thanks
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Old 02-19-2006, 09:10 PM
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I am learning as I go. I think the 305 heads sound good. I have a question though. What do you mean about "spark knock"
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Old 02-20-2006, 07:45 AM
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Quote:
Originally Posted by rhibbsiii
I am learning as I go. I think the 305 heads sound good. I have a question though. What do you mean about "spark knock"
pre ignition/ detonation, fuel mixture ignites before it is supposto, you get it real bad and your cleaning pistion material off the spark plugs.
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