[RichardM]

I just re-checked the Rally America rules. I can go to 383 cubic inches in my 1995 Mustang rally car. I was going to rebuild the existing 5.0 engine into a 347 but more displacement is always good.

Any thoughts on how to get 383 CI?
TIA

By the way, it has to be able to pass pollution since I need to be street licensed and inspected.

[2k4mk1]

Originally Posted by RichardM

I just re-checked the Rally America rules. I can go to 383 cubic inches in my 1995 Mustang rally car. I was going to rebuild the existing 5.0 engine into a 347 but more displacement is always good.

Any thoughts on how to get 383 CI?
TIA

By the way, it has to be able to pass pollution since I need to be street licensed and inspected.

If you want it to last you will need a 351 block to get 383ci. I beleive you can stroke a 5.0 to 383 but it puts the rings on the piston pin and they tend to to last long on street cars.

[95 GTS]

I would built a DART Block 366. Since you are road racing, I would not go 351 based, rather get a dry sump aluminum dart block.

does it have to be a ford motor? you can always go LS2 with a JE k member and T56. with a simple cam swap you would have over 415 at the wheels

[racer99]

Originally Posted by 2k4mk1

If you want it to last you will need a 351 block to get 383ci. I beleive you can stroke a 5.0 to 383 but it puts the rings on the piston pin and they tend to to last long on street cars.

Nope, about 362 is stretching it.
If you go 351 based .030 will get you 357
inches and you could offset grind the crank
but then the off the shelf piston deal is out the window.

I would think you would want a long rod motor as you will
want torque in the low and midrange.

[RichardM]

Originally Posted by 95 GTS

I would built a DART Block 366. Since you are road racing, I would not go 351 based, rather get a dry sump aluminum dart block.

does it have to be a ford motor? you can always go LS2 with a JE k member and T56. with a simple cam swap you would have over 415 at the wheels

I have to stay with a Ford block.

My friend up north is building one like this to replce his 351 that broke the crank into 3 pieces. He is starting with 4.0 bore and 3.75 stroke. But since he is in Minnesota, he can run a big carb while I am sure I will need fuel injection with an O2 feed back loop.

[thesource]

If 383 is your limit , I would also go with a 4.125 bore 8.2 deck engine . Install some large heads like the AFR 205 and match it with a nice solid roller camshaft designed for your set up . If going EFI , use something like a Holley Systemax and if going carbed a ported vic jr with a 750 mighty demon .

Transmission wise , I'd look into a T56 or at the very least a Astro A5 geared T5 . Hit me up if you need anything transmission related .

[Sonic Blue 85]

You can go either with a 302 8.2 deck ford or dart block, 8.7 deck dart block, 9.2 351 ford or dart block or a 9.5 ford or dart block. If you stick with the 8.2 deck block you you will have less weight in the front end, lower center of gravity, more room around the engine and a lighter crank with smaller main and rod bearings. The smaller rod bearings will not build as much heat and reduce friction. You can build up to around 380 ci. with a 3.4 stroke crank in a 8.2 deck block. Some of the good blocks can be bored to 4.155 and some to 4.180, the larger bore will also help your heads flow more air. The 8.7 dart block is basicaly a 302 block that is stretched, so you still have the 302 rod and main bearings. If you use a 351 based block it would be better to get a block that has cleaveland mains instead of the windsor mains, the cleaveland are smaller. If you use a stock windsor or sportsman block or a good block with windsor mains you can also install bearing spacers and use a crank with cleaveland mains. If you could run more than 383 ci I would definitely say go with a 351 based block, but with that limit I would say it would be a case of how much you are willing to spend. If the displacement is the same a 8.2 deck block will make more power for multiple reasons, but may cost more to build because you will have to spend the money on a good block. You can build a lot more than 383 with a stock 351 or sportsman block, but it will weigh more, be larger, have a smaller bore, more rotating mass and more friction. If you plan on buying a good block the cost will be close to the same, with the 8.2 being little cheaper. Another possible advantage with a 351 based engine is the longer rod if you are turning a lot of rpm, but at the rpm you will be running the longer rods in a 351 based engine will not help you.

[RichardM]

Thanks for the advice. Still thinking especially since I saw the 347 block with crank and pistons that Ford racing sells. But first I have to get the new engine and transmission in the '66 Fastback.