Back at it again. Installing my homemade intake using the lower efi manifold - it interferes at the firewall - naturally. Considering cutting the firewall but..... having 2nd thoughts as the lower efi isn't the prettiest - not sure my upper intake improved it. Original plan was to cut carb plates into the homemade upper once I figured what mixers to use. I currently have a single Impco 225 and was considering dual 225's or dual Impco 425's to get to my 350-400 HP target once my turbo is installed.
Do I cut the firewall and continue with this manifold or try the new Offy C manifold with the heat riser eliminated and spare my firewall but, loose the dual carb option. I am using EFI exhaust manifolds. I started this manifold project during Covid when Offy manifolds were out of stock. I relocated to the East Coast from Vancouver, BC where propane know how was a bit more available. So far I'm not finding the expertise I was hoping for. Definitely my issue but, it really hit me while staring at it and finding I'm not too impressed.
The lower efi manifold has injector ports so could I adapt it to allow use of Propane injectors which would allow me to use a fuel rail where the train tracks stare blankly at me. That could mean I could cut the upper log to plumb the turbo rather than carb plates for mixers and maybe make this thing look a bit better. Is this making sense or is it unnecessarily complicated. Does anyone have ideas for this setup?
I was going to drop off my 240 head this week at the machine shop for hardened seats and 1.94 Intake and 1.6 Exhaust valves. The shop, will install seats then let me do Port and Polish (Read David Vissard's book) before doing the final valve cut and lifter assembly. As much as I like the Straub/Promaxx head it's just not in my budget. I'm planning for forged pistons to get to 10:1. Info I've collected suggests higher compression for propane then run boost at around 8 pounds. I'd like to go with the roller cam and lifters but, not sure I need that for my intended HP target. Also roller rockers potentially depending on budget.
Initial plan was to run a remote turbo out back, then saw DFW Speed Syndicate installs and thought to plumb it up on the passenger side but, the regulator and mixer mounted on the passenger fender likely means the best I can do underhood is to get it over to the drivers side. First world problems.
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