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Discussion Starter #1
Looking to build a higher h.p. L28 for a 77 and I am wondering who out there has done the sroker conversion and what they think? I want a higher output motor that won't require major mods to the F.I. and is reliable. Not a daily driver but I don't want to sit in a rumble machine that gets 10 mpg..... I've got a good idea of what I want but I would love some imput from others....... ya know fast is good but faster is better..... Thanks
 

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there are several sites to go to and find info on going big bore on a L28 engine. You can still run good road performance ( 17-19 MPH) if you stay off the accelerator. I'm running a bored and stroked L28 that is about 3.0L I am using 72 carbs , E36 manifold, MSD ignition, 82 tranny and 3.9 rear-endand yes hold on to your you know what when it cranks. It is scarry at 5-6 grand.Look around at other Z sites for more info.
 

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I did the big bore kit on my z. It is bored like 090 over and its running high performance cams. W/ lifters and springs ect.. I had it professionaly done by a z performance shop. I get good mpg about 20; when im cruzin but if i fly its not good at all.(9-10).. The kit is very worth it i think. I dont really push it cause its a daily driver but it gets up and goes when i need to. The only real complaint i have is that its expensive for the oil changes due to the aluminum pan that holds 9.5 quarts and i run the synthetic. I did have to get a Lsd in the rear and have had trouble keeping the driveshaft bolted down tight due to the torque.
 

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The job would be too much work for me, and the price of the kits is way up there in my opinion. But if you can assemble the right parts yourself (like a diesel crank for example) and do the work yourself, it would be a great investment.

Somehow, I wonder how much money you can/should put into an L28 before upgrading to a V8 is more desirable. After all, all other things being equal, you can get quite a lot of hp per $$ going "Detroit." You'd have a host of other issues to deal with, but at some point maybe you outta think along those lines.

Just my .02
 

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I built a 77 280 with the following parts

1) Swapped out the N47 head for an N42 round port. It has been ported by AFR.
2) Flat top pistons @ 0.030 over giving total compression of 9.6:1
3) MSA stage I cam kit from Schneider
4) Header
5) Lightweight Flywheel
6) Centerforce II clutch
7) 2.5" exhaust including hi-flow cat.
8)Still has stock crank and rods were shot-peened.

It is quite a quick car now and still gets 24mpg average. No pinging on 91 octane. Good idle quality. Fuel and ignition system are stock.
 

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Discussion Starter #7
You are totally on the same thought process as I am..... do you ever wish you had more in the tank..... ya know just street driving not racing..... dgracer..... any other mods you could have done earlier with the rebuild that would have made a difference
 

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why would'nt you want to sit in a rumble machine????? i say lose the exhaust from the header back, rich er up, and go thru restaurant parking doing burnouts. oh yeah, and enjoy the free back massages.
 
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