So here's the deal. My dad has a 69 camaro with a 355. Turbo 400 and a currie ford 9 inch w/ 4.56 gears. Has his 350 cloned after a car craft motor build in which theirs produced 522 hp on an engine dyno and 454 torque. Their timing is setup at 39 degrees max, has smaller aluminum heads than our bigger iron heads, and our compression is roughly 11:1 compared to theirs at 10:1.
My dad has his 355 with the same cam but slightly more duration (not much), iron eagle 210 heads(not aluminum like in their build) and 11:1 c/r as i mentioned. Same size carb, all that bs, everything ELSE is basically the same except their distributor is a gm hei, and ours is a mallory unilite. We also have a 1/2 inch more spacer for the nitrous plate setup for our 100 shot. lol
So while we're on the chasis dyno, we were expecting somewhere in the 400hp/torque range since the drivetrain takes up some power as you know and all....Well...We were pretty embarrassed, even though it sounded good and all! lol...We pumped out a whopping 265 hp to the wheels...We aren't real confident about what our timing is now because of the #'s...but our initial timing was right at 9-10...During the dyno my dad said it fell flat and stopped at 5500 rpm, but we have a full roller setup and we've taken it to 8k before. Our valve lash is setup at 12-14, 12 intake 14 exhaust and after the dyno, we changed the initial timing up some but didn't go for a 2nd run. As we left the place my dad stomped on it and took it up to 6100 no problem?
Our spark plugs are brand new, as well as the wires and cap too, the rotor is the only thing that probably have the full 800 or so miles on it as the engine does. The plugs have a nitrous test run under them so basically all of them look shiny, no speckles or bad burn marks on them since then...all but one of them look pretty damn shiny, the one that doesn't is all but shiny in one spot where there is a gray spot. We once had the fuel pressure too high so we're wondering if we blew out the needles and seats but when we drive this thing around town it seems like it runs pretty good..? Maybe we just don't know what a 500+ hp motor should feel like and we're missing something here...I have noticed myself when he hits the throttle it doesn't sound as crisp or snappy as it once did when we got the motor running for the first time....
We do have a small burn mark/crack in the #3 cylinder but that has been protected with a heat sleeve/boot ever since. We drove it around town once after we put new headers on where the #3 cylinder plug wire basically was resting on the header. We want to say it was misfiring, and you'd think we'd be able to hear it but the car is so loud, and we're maybe mistaking the misfire for an exhaust leak as we did lower the car and it does scrape coming out of the driveway so we thought maybe we have a slight exhaust leak. Also, the #5 cylinder, the tip on it where the plug wire meets it, actually unscrewed itself to the point where when I was taking off the plug to check gaps and how they looked, that the tip fell off as I was undoing the plug so I screwed it back on. BUT, that plug looks just like all the others, fine? Sorry I know I've written a novel but I figured I'd go over everything so you guys know the full story before guessing if you don't mind helping.
Our plan is to : put the spark plugs back in, replace the #3 cylinder plug wire, (btw the heat sleeve on the plug looks perfect, so it hasn't been burnt through even though it's on the header) and then start raising the initial timing since it ran better after leaving the dyno after we had raised the initial timing there. So we're gonna start messing with timing until it pings then back it off some, and replace that one wire and go from there. Any other ideas would be appreciated.
btw, the engine build we cloned is in my signature...
the gap on all plugs were 35