I'm looking to get a new set of heads for my 67' 327. I'm wanting 2.02/160's and I don't want vortec heads because I don't want to have to buy another intake. It is in an 85 camaro with shorty headers so would straight plug or angle plug be better?

here's what I've got

- 327 .040 over
- hedmen shorty headers
- 282* .465" lift cam
- edelbrock 750
- aluminum intake
- flat top pistons (originally had dished)
- 1.72/1.50 camel hump heads. (yes, i said 1.72/1.50's :bang: )

thanks,

Chris

 

check locally. shipping sucks on heads. I picked up a set of sportsman II heads with under 1000 miles for $400. I can't tell you how they run yet, as I still have to set the valve lash, but I hear they're comparable to the dart iron eagles. I have hedman shorty headers, and have straight plugs. definently put the spark plugs in before you put the headers on.

 

Yeah, staight plugs suck with these. I have to unbolt my headers just to change my plugs and it sucks. Thanks for the advice, I never thought about that. I was just thinking Jegs or something.

 

Whats the casting number on the cylinder heads you have now? (under the valve cover)

 

i had my iron L98 heads ported out to the max for only 600$... i should be getting the flow sheet soon from my mechanic, so i'll post it if i can find a scanner, lol

 

8917298


Edit: Ok, it was cold and dark outside, and after further evaluation I've decided that it is either 3917293 or 3917298. It really looks like 3917298 though.

 

The lil FR$#@!^ numbers are had to see aren't they ...

 

Yousa looks like a genuine lowly 307-327 2barrel low compression head.

I was going to suggest a good old 327 fuelie head
like what came on corvette from the 60's except a late version with alternator mounting bolt holes in the ends.
Often you can get these heads refurbashed and ready to bolt on fr that kind of money. More flow and higher compression. look for casting ending in 186 492 041 040
370 I'm sure i've missed a few.

Another alternative to wake up your 327 is a fully ported big valved modified 305HO/TPI head. "416" or "081" casting

You'd be suprised how much the things flow when fully tweeked with larger 1.94 x1.60" valves and full porting.
the small combustion chamber will raise the compression nicely from what you have now.
Are you interested in porting and rebuilding your own set of heads?
A 305 head, not the the ones you have now.

 

Do a search on the Classifieds for "416" if you're interested in what F-BIRD'88 is suggesting.

 

wouldn't the 58cc chambers be too much to run on pump gas? I'll be running on pump gas as well as a daily driver btw. How does a 64cc chamber sound? I just always thought that the small chambers on the 305 heads would push the compression up too high to run on pump gas.

 

The 58cc chambers won;t raise it too far on a 327 motor.
They are rarely exactly 58cc anyways. Usually bigger.

When you fit the head for the larger hi- perf valves you have to relieve the chamber a bit around the valve edge.
This "unshrouding" increases the finished chamber size on a 305 head. Typically end up with 61 to 65cc's.
Then you can flat mill the head to make it smaller again if you want. Ive had them come out at 65cc's after modding them and max flat milled them to 52cc's , So there is loads of room for getting the cr just right.
The piston in the motor rarely comes all the way to to top either resulting in a lower than expected cr once you actually measure all the specs and calculate.
Yours is a .040" over flat top piston 327 right?

 

If indeed it is the 293 (considering as how 298 is a block casting):

3917293....'68......307/327......75cc chambers

Yup with the deshrouding and all that F-BIRD talks about and the ability to mill a head back to size, in conjunctiopn with the fact that you can get head gaskets of various thicknesses, changing the compression ratio via cylinder head modding is relativelly easy. What pistons are you running with?

 

Sure is.

 

Speed Pro flat top hypereutectic pistons

 

I calculate/guestimate your cr to be 8.26:1 with the heads you have now. Bolting on a 58cc head would raise that to 9.87:1 . Just right..or some 92 octane gas...but not for 87 octane.

I'm assuming a few things like using a felpro .039" thick gasket and the pistons being .025" in the hole at TDC.
and your head being 75cc right now.

 

I tend to get upset if a place doesn't have 93 octane, I never think about running 87.

 

Great if i'm going with a supercharger, but I'm not. Man, that sucks. So could I get some 58cc's with 2.02/1.60's or will I have to stick with 1.94/1.50?

 

You're talkin to F-BIRD....one of the premier experts on casting 416 modification. Do a search under his name. Also, you can look up Sitting Bull. Hes another person whos posted good porting results with 416's.

 

You can install 2.02's in a 305 head but it won't make them perform better than a 1.94 valve.

1.94 and 1.60 are the best for this head. Has to do with shrouding and other technical stuff. Some other head maybe but not this head.
Gives you more velocity too.
if you do it right and port the heads thouroughly you'll think there is a 4" valve in there when you nail the gas pedal. Don't worry they will flow tons of air.
we're talking about more airflow than some aftermarket heads. 230+cfm intake 180cfm +exhaust

your heads probabily don't flow more than 175cfm intake and 120exhaust.

 

Dart Iron Eagle 215, 220, or 230cc heads. they are all around $780 from this estore on ebay. those heads flow around 290cfm @ .650" lift

 

I just want a head that will make my motor perform better than it does (enough to notice) but I'm just afraid that if I go with something like a world S/R Torquer 58cc w/ 1.94/1.50's it will push my cr up too high for pump gas