Sky's the limit here folks. What would YOU build?You can go with exotic and rare, or screw together a budget motor. Only condition is it has to be do-able. And it doesn't have to be this one. This is just mine...
I've been thinking about the Oldsmobile 350 Diesel lately. Parameterically, it's very close to the SBC 350. 4.057 X 3.385 to be exact. High nickel content, and THICK cylinder walls. Compared to gas 350s, the diesel has 3.0" mains, so it's possible to stuff a big block Olds 425 crank (3.975") in it, and bore it as big as 4.25", but that's not what I'd do...
Rod journals are 2.12, which means cutting them down to the smaller 2.0" SBC rod journal, with an offset grind of course, could easily give you an even 3.48 stroke. 6" rods would reside here, and seeing as deck height is 9.33, zero deck is only .030 away with a regular SBC 350 pin height. To use a readily available piston, I'd go with a 4.155 bore. So I'm ending up building an Oldsmobile version of a 377 SBC.
Big block heads will work (bigger ports) with a Performer RPM, and they have bigger valves. 2.07 intake uses a 30 degree seat, but there is minimal shrouding so it should flow well. The exhaust valve is a little 1.62, which would get replaced by a Pontiac 1.77 (need more exhaust flow when you're going to spray the hell out of it
) Compared to the SBC 23 degree heads, the olds has almost no valve angle, I'd be surprised if it's over 5 degrees, so there's less of a turn for the exhaust too. With the 80cc chamber, static compression is 9.68 to 1.
I suspect that this motor would be almost bulletproof. Just need to figure out valve notches, and which valves to use. Too many vacuum lines on this '307' would also help to finish the image, and hide the nitrous at the same time.
I've been thinking about the Oldsmobile 350 Diesel lately. Parameterically, it's very close to the SBC 350. 4.057 X 3.385 to be exact. High nickel content, and THICK cylinder walls. Compared to gas 350s, the diesel has 3.0" mains, so it's possible to stuff a big block Olds 425 crank (3.975") in it, and bore it as big as 4.25", but that's not what I'd do...
Rod journals are 2.12, which means cutting them down to the smaller 2.0" SBC rod journal, with an offset grind of course, could easily give you an even 3.48 stroke. 6" rods would reside here, and seeing as deck height is 9.33, zero deck is only .030 away with a regular SBC 350 pin height. To use a readily available piston, I'd go with a 4.155 bore. So I'm ending up building an Oldsmobile version of a 377 SBC.
Big block heads will work (bigger ports) with a Performer RPM, and they have bigger valves. 2.07 intake uses a 30 degree seat, but there is minimal shrouding so it should flow well. The exhaust valve is a little 1.62, which would get replaced by a Pontiac 1.77 (need more exhaust flow when you're going to spray the hell out of it
) Compared to the SBC 23 degree heads, the olds has almost no valve angle, I'd be surprised if it's over 5 degrees, so there's less of a turn for the exhaust too. With the 80cc chamber, static compression is 9.68 to 1.I suspect that this motor would be almost bulletproof. Just need to figure out valve notches, and which valves to use. Too many vacuum lines on this '307' would also help to finish the image, and hide the nitrous at the same time.
