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#1
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B/B Edelbrock head questions
Thinking of buy aluminum edelbrock heads which will go on my stock 70 383 shortblock(exept for .484 cam).It also has a performer intake,hedman headers.My question is what performance difference is there between the 84cc and 88cc heads.I have a chance to buy the 88cc heads for a good price but didnt know what to expect if i put them on.Also heard maybe some spark plug/header interference?
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#2
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Heads
If the price is right bye them have the head cc s cut to what you want there is A lot of deck material there.
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#3
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The only difference is the head cc amount which should figure into the compression ratio for a nominal drop.
Like bullet said. |
#4
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What kind of gains would i see from these heads over stock heads?
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#5
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Eddy head
Do you have 906s know ? Are they ported? need more info , comp. height. If their stock know you will love the change
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#6
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does not sound like enough cam for those heads. they flow very well compared to your current iron heads. Best to change the cam too. you already have everything apart anyway...
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#7
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I have the stock 9.5 compression pistons,the iron heads are stock with good isky double springs,.484 cam,hedman headers.So these are a direct bolt on,no mods needed?
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#8
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You will have to check your push rod length . And not A must put A (good) valve job will pick up cfm and air speed . Int 35 deg top. 45 set. wide 60. 75 deg bottom cut . On the exh radius with A 45* set. Int (valve) 45* with A 30* back cut. Exh (valve) 45* 26* back cut.
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#9
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The best way I can describe my small block heads are they feel like pocket port iron heads. Real nice increase.
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#10
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What is a "9.5:1 piston"? With what head cc's and head gasket is the cr 9.5:1? Are they flat tops, and if so, how deep in the cylinder at TDC? these are things you have to check first. I think, the 84 cc closed chamber is the version you should use, but if you want good performance, do the math and take care that you truly have at least 9.5:1 compression ratio. The heads will work even with less than that, but the engine will be a lot crisper with higher CR and the relatively big hydraulic cam (for a 383) you have.
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#11
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The 9.5 compression ration I'm just going by the advertised ratio of a stock engine found in performance manuals.Its got felpro .040 gaskets.Im just wondering if the 88cc heads are a dissadvantage in my application and what performance advantage i would see over stock 906 heads.
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#12
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RPMs can make good power.
If you are just going to take off the heads while it is in the car,
you will need a good shop to get the cc's of the heads and the block. You'll need to know what the comp. is and not guess at it. Is the intake a performer or a performer RPM? If it's just a performer, sell it and buy the RPM. The performer RPM makes alot more power over 5000 rpm. The 88 cc heads can be shaved if you can get the comp. up around 10 to 1. This is what the shop will find out when they cc it. Get a better cam. Otherwise don't waste your time with the swap. How good of a deal is it? Will the headers fit your car? Yes, some plugs will not work with your headers. Champion has a short plug that will work with the angle plug heads. The MSD 8.5 wires can touch the headers at the boot and not burn through. You will like the power increase. You'll like it even more with a little port work. That 383 can run 6500 rpm easy. After you get used to it, you will want the 383 stroker kit (496 CI). Then it will be time for some Victor heads! |
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