I looked on ebay yesterday for a Z/28 high rise intake and one guy was asking 500 bucks for a used one.. I was so pissed off, I turned 10 shades of red when I seen that add.. GM was selling those over the counter up until 10 years ago for maybe 200 bucks brand new in a box...
I knew they quit selling them about ten years ago, but I had no idea they were pulling that kind of money!
There was a thread on steel LJ 327 cranks on speedtalk a while back, quite a few guys had one or two. They arent really that rare, not that LJ 327's were all that common. I think a lot of guys actually have cast 307 cranks, and thats where the myth that "all" LJ 327 cranks were cast got started.
The ones they sold up til 10 yrs ago looked nothing like the originals. They had a square, block kind of casting where the port met the head. Nothing like the sharp, clean edge of the originals. What was this thread about again?
I've had lots of them. I love 'em. Factory red line of 7200 for the small journals. Still have a couple small and large journals laying around. Been weening my self of them for the last year. Had five or six a year ago. down to 3.
Parts that make a 327 sing! .... Like an original '67-'72 chevrolet Z/28 aluminum intake manifold which is one HELL of a great piece to bolt on any small block chevy motor from the grand ol' dayz... I had 2 of those at one time... I should have held onto them...
Holley used to make a "Street Dominator" intake that was a virtual copy of the '69 Z/28 intake. I still see them at swap meets occasionally.
yes, the 300-36. Excellent intake. I saw a dyno test comparing the holley, an Edelbrock Performer RPM, and the original Z-28 intake, it was a virtual draw. A C3BX would split the difference between these three intakes and the Performer, about 10 hp down on a typical 400hp 327/350. There was also a Holley Street dominator single plane, 300-1 or 300-19 depending on the version, not the same intake. Iron Maiden, i will pm you tonight, i am at work right now.
So is the issue of my motor the compression ratio? What is the culprit? The TRW pop up pistons? The motor was built for street use and to use on pump gas. If the compression ratio is too high, why would it have been built this way? School me here on the reasons to go with higher compression. Does it make more power? Could I just swap out the pop ups with flat tops or is it more involved then that? Will I lose power by doing so? Just trying to figure out my options. Would rather not have to put more $ into it. I paid 1K for the motor already and will still need the intake, carb, dist, headers, water and fuel pumps, and all the drive accesories. To think I might now have to tear the motor down to replace internals makes me think I made a mistake by buying it.
the 327 is a hell of an engine! and besides that not just one of those millions 350's... I had one in my model a pick up truck, wow...what a nice, hot little engine!!
I have one well its the holley contender 300-06 bad *** intake just as good as a new rpm air gap IMO.
By the way the orange 55 as my avatar is my dads, It has a 331 sbc, 327 .30 over, But heres the thing, its a 350 4 bolt main, with a large journal cast 327 crank, stock rods with arp bolts, GM 350-375hp dome pistons, its all been balanced, 461 heads ported to the max lol they look rediculous they have been hogged out pretty good, screw in studs, tripple springs, roller rockers, crane 302 H06 cam, 500 lift 302 duration, 106 lobe sep sounds wicked, edelbrock street tunnel ram, 2 holley 600's, points dizzy, hedman longtube headers runs strong, hits 7 grand easy, btw its backed up by a muncie m-22 and im guessing 3.73's or 4.10s it runs pretty geared down on the free way turning 3500 at 60 or 65.
I have the same 327 short block. I used 75cc smog heads, cleaned them up gasket matched and polished the exaust side,and domes. we took some off the surface,but i don't remember how much. Its about 9.25 to one. 9.5 or 9.75 would be a lot better. I run 10% eth. and don't need prem. fuel. if you can find some 70cc heads it would be better compression ratio, is a ratio! it compares the tdc measurement to the bdc measurement. like 9to 1, the smaller the combustion chamber, the more increments it is to BDC (botton dead center). or maybe 10 to 1. compression ratio and the gas octane rating have to work together. high compression ratio and good gas = horse power now you lower your compresion ratio to 8to 1 it'll run great on reg gas but your not getting the efficient use of the fuel... lower MPG, and less horse power.. the trick is to get the comp. ratio, cam specs. ect to use ALL THE OCTANE available in the gas. also the higher the octane, the slower it burns If i would use 70cc heads on my 327, it would have more power... and wouldn't use any extra gas. and i could use the same gas
The 327 was one of the best engines GM ever built. Can't go wrong with one. For the money, the 350's no slouch either.
I have had several over the years and loved them all. I even have one on an engine stand now, and have been collecting parts for it. Long live the 327!
Got one in my deuce 3 window and building another for my deuce roadster. I compromised and am putting a (gasp) 350 in my deuce delivery!
I have the same deal out in the shed, an #010 350 4-bolt main block and a steel LJ 327 crank. have a set of #461's and a TR1YX as well.
I found a GM intake local. Guy has it listed as "69 Z28 4bbl intake manifold '72 x port" Number on the top is 3932472 What intake is this?
One thing to watch out for, it may have the plenum divider milled out. I dont think that would be the tip for your combo with the mild cam, heavy truck and 3.55's.
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