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Joined: Sep 2005
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Can someone tell me what the advantage of the '848' cyl head for the 235 cid engine is? I remember reading an article that said it was one of the best heads for beefing up the 261 (vent holes added), but it didn't say why. Is it higher compression, bigger valves - or what?
If it ain't broke...break it.
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The combustion chamber is smaler, which raises the compression slightly is all.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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Joined: Aug 2004
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What is the difference in the compression? I have a 54 head that needs rebuilt, and a 61 848 head that was sitting in a field for about ten years uncovered. I havent got it cleaned up yet, but wonder if its worth the time.
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Joined: Mar 2003
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It's about 0.5-0.8 more than the 261 head when used on a 261 block. The 848 head has better ports than the '54 head too.
1950 Chevy pickup with '62 261, 4 speed.
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Cabbie, A good stock 235 head is around 7.5:1 and an "848" head is around 8.0:1. Either head can be selectively milled, but will require recessing the valves. If you find that your dirty "848" head checks out ok, just have it surfaced milled...no valve recessing needed... and you'll have 8.0 to 8.2 compression ratio. Perfect for the street.
Drew
Mid-Atlantic Chapter
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Joined: Nov 2005
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check the post in performance and click on 848 porting. there is a link there that will take you to a '55 article on the test they ran on the 261 and 848 heads. Great article.The only problem is 50 years ago 18.00 could buy a corvette split exhaust and I just paid 500.00 .boo hoo LOL
1946 Chev Aerosedan
Most southernest inliner in Canada
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The 848 head has a diffrent alloy steel which has a higher nickel content and less prone to cracking.
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