russb31021 wrote:Well can you give my any tips on how to build the motor and transmission mounts and whats the problem with the oil pan i have heard alot of ppl talkin about the major problems with the oil pan. Im new to this i just had a 350 laying around and i bought a 240sx without a motor so i decided to put the 350 in the 240sx.. I appreciate all your help
russb31021- I'm pretty sure you sent me an email and since the question is pretty general I would rather address it here so others can benefit. You're first question is about how to make the mounts here is an overview:
First what you're going to need is a mock up engine. Basically it's a plastic model version of the engine that is 100% exactly to scale and even has all the bolt holes in it so you can attach any real parts you want (oil pan, valve covers, accessories, transmission, etc). They cost around $300 but you can sell it when you're finished for around $250. I can't stress this enough... Under no circumstances do you want to attempt this without a mock up engine it makes everything a THOUSAND times easier!!!
Once you get your mock up engine, put your transmission in place on a transmission jack and bolt the mock up engine to the transmission. Next you're going to have to take the engine in and out a million times (why you have the plastic engine) finding the best spot for it, and making sure nothing (headers, oil pan, valve covers, brake booster, steering rack, steering column) hits each other. One thing you can do is mark where the transmission will hit the tranny tunnel and bash that spot with a mini sledgehammer, this 'technique' will help you get the tranny a few inches further back. Next you're going to need one of these:Which you will use to make sure everything is lined up side to side, and about a 3% incline higher in the front than back. Then bolt on your engine side motor mounts, from there it's up to your imagination. Think of a simple way using a few pieces of metal to bolt the other side of the motor mount to a flat piece of metal and attach it to either the frame rail or the stock crossmember. Make a prototype out of cardboard, then cut it out of steel, tack it together and see if everything bolts up right or not, if everything is ok then weld it together and you're done!
Your second question was about the oil pan: Take a look at the oil pan on your SBC and you'll see the sump is in the rear, the 240SX uses a front sump, and the crossmember and steering rack are where the rear sump would go. You have a few choices, move the steering rack (big PITA, will destroy handling and possibly be unsafe), cut out the firewall and move the engine WAY back (PITA, will never be streetable again), go with a dry sump system (PITA, expensive, complicated), or possibly the 62-67 nova front sump pan might work which looks like this:If anyone ever tries the Nova pan please let me know! Also if you're thinking about doing the Nova pan or dry sump, SBC engines/oil pans changed in 85/86 from a 1 piece rear main seal to a 2 piece so make sure your engine and oil pan are compatible.
Modified by Davidss at 4:14 PM 12/19/2007