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Old 12-14-2007, 08:29 AM   #1
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World S/R heads, or....?

I got a set of heads. They say S/R i-052 and has a big W in the rocker / valve spring area. On the front & back of the heads it has a big J and 0 then a small 5.

I measured the valves, looks like it has 1.94 / 1.5 valves. Any ideas?

Thanks in advance.
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Old 12-14-2007, 12:34 PM   #2
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Re: World S/R heads, or....?

"W" is for World Products, the company that makes the heads.

S/R is for the type of head it is, which sounds like the entry-level S/R (Stock Replacement) head. I say that becuase of the small 1.94/1.50 valves. The more performance-oriented S/R torquer heads have 2.02/1.60 valves. I beleive they were available in either 67cc or 76cc chambers.

However, they also made a 305-version of the S/R heads that has smaller 58cc chambers like stock 305 heads and 1.94/1.50 valves.

See if there's any other marking on the heads anywhere that could give you more clues. When I had my S/R Torquers years back they had the combustion chamber size number stamped into the end of the head, as I recall.

FYI- Dart doesn't sell S/Rs any more. They've changed the product line to the new S/S heads. Specs are similar but the options for chamber sizes, valve sizes and such are a little different. And I don't see where they offer a 58cc chamber (3405 head) any more.
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Old 12-14-2007, 07:10 PM   #3
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They're allowed on Semi-Lates.

http://www.thundervalleyraceway.com/street2.htm

That can't be good.
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Old 12-15-2007, 09:00 PM   #4
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Re: World S/R heads, or....?

Well I was reading an article on how Lunati (using stock 305 heads with bigger 1.94 valves installed, a Lunati cam, Edelbrock Performer RPM intake, and Holley 600cfm DP, 34* total timing, and long tubes) got 343horsepower. So I figured since I have these S/R heads with the bigger valves and already have that intake and carb, all I'd really need to do is get me the cam and call it a day. Ofcourse I'll be running shorty headers as opposed to long tubes as well.

Anyway, if these heads aren't the 58cc 305 heads. What will my compression be (roughly) with the 76cc heads? 67cc heads?
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Old 12-15-2007, 10:24 PM   #5
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Two words - "port work".

Those aren't the 305 heads, although they probably aren't any worse. Except for their effect on compression.
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Old 12-15-2007, 10:24 PM
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