Summit Cylinder Heads
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Does anyone have experience with Summit brand cylinder heads? Specifically I am looking at a set of cast iron heads with 72cc combustion chambers, 2.02 intake/1.60 exhaust valves, 1.25" valve springs good to .520 lift and 165cc runners. Summit part number SUM-152123. The valves in these are bigger than the vortecs with only 5cc less on the intake runners. They will be going on a built & bored 327. I have read a few times that the Summit brand parts are often good parts that Summit has just put their name on. I don't know who makes these, but the price is good and the flow SHOULD be what I'm looking for. Any comments, recommendations, experience? http://static.summitracing.com/globa...sum-152123.jpg |
Re: Summit Cylinder Heads
I don't have any specific knowledge of these heads, but did you know that Summit Racing Equipment's parent company also owns TrickFlow?
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Re: Summit Cylinder Heads
They are good quality heads. However that 72cc combustion chamber is a drag. I was going to ask you why you didn't go with the 64cc heads with the 2.02 intake valves but I just went to their site and they don't have them listed anymore. I was fixing to order a set myself for 299 each. Now I'm miffed!!!! I should have bought them sooner. The only 64cc heads they're showing now have the 1.94 valves. I'm gonna have to send them an email and find out what happened to the heads I wanted.
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Re: Summit Cylinder Heads
highperf4x4 if you get any info on that please let us know! I was wondering myself why they didn't offer the 64cc chambers on them cuz I'm sure they'd sell a lot more of those than the 72cc's. That's what I really wanted, but I figure if that's all I can get at that price I can just buy some domed pistons.. I'll have to check my clearances though.. don't want any boo boo's.. lol
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Re: Summit Cylinder Heads
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I've got them on my 327.
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Re: Summit Cylinder Heads
I got these a few years back and they are a good deal for the money.
http://www.summitracing.com/parts/WRL-011250-1/ and NO,they are not made in china as some have rumored them to be.still made in michigan. |
Re: Summit Cylinder Heads
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Re: Summit Cylinder Heads
yes,64c.c.and 2.02 intakes. they have manley s.s.valves and when I got mine the runners were 220cc and now they are 200 but I doubt you would notice the difference in a street machine.
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I would try to get the 64cc chamber. The 72's are almost too big ya.
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Re: Summit Cylinder Heads
How about some patriot aluminum heads? These have the valve size you want, 64cc .
here is a link to them https://www.patriot-performance.com/...&cat=40&page=1 |
Re: Summit Cylinder Heads
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Is any of that true, or were they just trying to sell me? |
Re: Summit Cylinder Heads
Don't get to bent out of shape about them being 72cc. 10;1 is the magic number for street use. If it is daily driver, and pump gas only. You will be glad you have the 72cc. A decent flat top piston with 2 valve reliefs and it should get you real close to 10:1, might even put you just over. Anything more than that and you end up running octane booster or mixing your fuel; 92 with some racing fuel. I didn't want to be hassled with that stuff on a daily driver. But it all depends on what you think is a hassle haha.
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Besides, people don't realize that the only advantage of an aluminum head is weight. A cast iron head will create slightly more power as it holds more heat in the combustion chamber. You're also alot less likely to damage a cast iron head. |
Re: Summit Cylinder Heads
Not quite sure how you come up with that. These pistons http://www.summitracing.com/parts/TRW-L2491NF30/ with a 72 cc head, and an 028 head gasket comes in around 9.5:1 according to my calcs. PHV is 3.40cc's so technically i guess its not a flat top, although the piston is "flat" on top. Scratching my head on why the compression distance is so small though.
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Re: Summit Cylinder Heads
Dart Heads are the best. I have 2 sets. Best aluminum used. Aluminum heads are more forgiving around the 11:1 comp. mark. Here's a bunch of info about the Patriot heads http://www.chevelles.com/forums/show...t=patriot+head
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As for those pistons, the specs seem a little off to me. |
Re: Summit Cylinder Heads
They might be for 6 inch rods, now that I think about it. I cant find the ones for the 5.7's. But the rest of the piston is the same haha. Coming in at 9.5 or maybe even 9.75:1 should be real good for 92 octane.
These kinds of threads are great when you are trying to put an engine together, and picking parts. A lot of ideas and info in one spot. Here is a really good website for engine combos, although I think some of the HP numbers are a little exaggerated. http://www.ryanscarpage.50megs.com/combos1.html Another edit :). I found the pistons I am using with the 72cc heads. http://www.summitracing.com/parts/STL-H631CP/ These have the correct compression height. |
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