Electric Power

[poor rich]

Good luck, when I got my truck the gas tank was out, and ready to go to Renu. Without thinking I went ahead and dropped the money on having the tank recoated then came the carb, then the fuel lines, then It dawned on me what I should have done, Im still kicking myself.
Rich

[Tanner]

Note that LPG converted engines will feel down on power & the temptation is to turn the fuel & timing up to increase performance - usually causing an early death to the engine. We had problems with gas companies turning up the timing & fuel on the Chevy 366/427 engined fuel delivery trucks & the engines met an early death. Broken pistons/bent or broken valves/dropped valve seats & valve seat erosion were usual problems.

I sold drop-in crate motors that were setup for LPG & we locked down the distributors so that the timing couldn't be advanced - if it was tampered with & the engine developed a warranty claim, we knew it had been messed with...

'Tanner'

[Master Yota]

I never had any issues with the "down on power" feeling. The engine would pull normally just like it did on gas. As for the timing, I found the most effective way to time the engine (SBC) was not with a timing light, but with a vacume guage. Play with the timing so that the guage would read the most vacume and set it there. LPG doesn't like a cam profile with lots of overlap on the lobes. The best cam specs are usually ones with lots of lift, and low overlap. As LPG is a gas, it will flow through whatever open ports (or valves) that it comes in contact with. The carbs can be enriched a little bit, but after a while, you just end up using more gas, with little to no performance gain. The majority (or most popular) brand of Carb is the IMPCO 425cfm unit for V8's. Most people will automatically assume that the 425 is way to small to adaquetly fuel a V8 - but one must remember that LPG isn't gasoline, so the usuall specifiactions for engine fueling are different. IMPCO also makes a 475cfm unit, but I've never seen on in the flesh, or on a shelf. I've regularly seen the 425cfm units power 440's,454's,and 460's just fine. One of the baddest engine's I've ever seen was 440 with dual quads of the 425cfm variant. It was a monster. With 4:88 gears and 40" tires, it would lay rubber for blocks...!