mundosuarez Posted May 25, 2017 Share Posted May 25, 2017 Back story......I have a 1978 20z than I'm completely rebuilding. First z and never worked on one before. I've owned it for about 2 years daily drove it and what not until I got a promotion at work and received company vehicle because of it about 4 months ago. Now I'm completely tearing down my car to send it to get media blasted so I can begin whatever body repair I need. At the same time I would like to begin my rebuild of the l28 in it. I know the over all goal is to v8 with a straight cut 5spd but for now I just want to learn the car in its new configuration for a year or 2. Also most of the money is going into suspension and chassis so I don't have a ton of money left over for engine. Well my question is... what combination of f54(which I have) block and cylinder head would give me the most compression on e85. Right outside my neighborhood is a gas station with e85 so I wouldn't have to go far to get it. I would also be getting rid of Fi and going 4barrel just because I know how to work with them. Also the added fuel flow capabilities of a 4barrel will help out with e85. I've thought about fully forged internals with 90mm bore. I don't want to spend more than 3.5k on all the engine work including machine shop work. This car will be driven on the weekends to shred the twistys or track days. I know everyone says the search button is my best bet but there's so much information and all the heads and stuff get me confused because I'm such a newb. If I could please get some help from all you L series gurus out there. Any information will be appreciated Quote Link to comment Share on other sites More sharing options...
TimZ Posted May 25, 2017 Share Posted May 25, 2017 I would also be getting rid of Fi and going 4barrel just because I know how to work with them. Also the added fuel flow capabilities of a 4barrel will help out with e85. I've thought about fully forged internals with 90mm bore. A 4 barrel calibrated for gasoline will _not_ help with e85. The required mixtures and jetting for E85 are very different. You will need to get a carb that was calibrated for E85 - do a Google search for E85 carburetor. Quote Link to comment Share on other sites More sharing options...
mundosuarez Posted May 25, 2017 Author Share Posted May 25, 2017 TimZ you are very correct. I should have specified that I was going to use a Holley ultra xp e85 as the carb. What cfm I'm not sure yet. I don't think I would need more than 600cfm. Quote Link to comment Share on other sites More sharing options...
JacktheRiffer Posted May 26, 2017 Share Posted May 26, 2017 In for e85 info. Curious about a high comp NA L series Quote Link to comment Share on other sites More sharing options...
seattlejester Posted May 27, 2017 Share Posted May 27, 2017 You would have to change out all your fuel lines as well as get a higher volume pump that would be happy to flow E85. The downfall though is with a manual system you are going to be in a bit of trouble if you are stuck somewhere without E85 and have to fill with regular. Without flex fuel, and especially with a carb that is not going to be fun to drive. Quote Link to comment Share on other sites More sharing options...
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