??? - replacement iron heads

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Jan 22, 2017 | 12:18 PM

Joe C

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??? - replacement iron heads

just curious on this - more down the road thinking. any reason these wouldn't be a "plug and play" set of heads for an iron head L98 tuned port? for the price of these, it's not worth running the OE 624 castings through a machine shop. not looking so much for any performance upgrade, and not interested in aluminum. from the reviews, it looks like these are dart heads sold as summit racing. application data says thru 86, so, any issues?

https://www.summitracing.com/parts/s...ions/year/1985

TIA -

Jan 22, 2017 | 05:27 PM

C409

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From: Clearwater Florida

..... They should fit just fine ... keep in mind that the price is for one head ... that puts you at almost $700 for small port iron heads .....

Jan 22, 2017 | 05:48 PM

Dt86

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From: Poughkeepsie New York

Did your 624's crack? Looks like a little more compression with these. If you get these please follow up on the thread.

Jan 22, 2017 | 06:12 PM

cardo0

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From: Las Vegas - Just stop perpetuating myths please.

What size chambers are your stock heads? I expect 76cc iron (624 heads you say). Yea going tighter chambers will bump your compression and test your engine for detonation.

Better choice would be World Products Torquer II w/76cc chambers or a set of aluminum heads with 64cc chambers. Edelbrock makes good quality heads for reasonable price.

Jan 22, 2017 | 07:42 PM

Hot Rod Roy

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From: Mission Viejo CA

My '84 also had the 624 heads, which I replaced with a set of 993 iron heads. My 624's cracked. Both have 76cc chambers and the same size valves, but the 993's have better ports. I need to pass CA smog tests, so I didn't want to go high compression. The 993's also have the exhaust "crossover" ports that I needed for my EGR. Not all heads have these ports! I rebuilt the 993's with the valve stem seals and exhaust valve rotators like my 624's had. I found my 993's on CL for $50 for the pair! Here's an interesting vid:

Jan 23, 2017 | 07:20 AM

Joe C

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thanks for the replies. presently I do not have issues with my OE heads, other that slightly worn valve guides. just gathering info and a little curious -

Jan 23, 2017 | 02:53 PM

mtwoolford

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From: folsom california

Quote:

Originally Posted by Joe C

thanks for the replies. presently I do not have issues with my OE heads, other that slightly worn valve guides. just gathering info and a little curious -

Go to a reputable machine shop (not necessarily the most expensive !!!) explain your situation and ask what it would cost to have your present heads magnafluxed and rebuilt. Then you can determine dollar for dollar, which way you want to go.

Jan 24, 2017 | 08:09 AM

Joe C

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Quote:

Originally Posted by mtwoolford

I really don't have a situation and not looking to replace anything in the near future, but i'd bet you can easily drop close to 5-bills on cleaning, pressure testing, magnaflux, (16) valve guides, and a 3-angle cut. not sure it's worth it on OE 462624 castings (which differ from 458624's in the video). for what the summit replacements cost, I'm thinking, if the day ever comes, the summit heads just may fit the bill. I would also think to take full advantage out of the summit assemblies, some intake porting/gasket matching and a set of headers would also be in order. AGAIN, just thinking here....