So that would be a good setup? and if the powerband would start earlier because it is a 347 would it end earlier? but the cam is advertised for a 302-351w so I imagine it will be pretty close
All things being equal (heads, intake and carb) the powerband will start sooner than a 302 and end sooner. But that's not a bad thing as the 347 will have boat loads more torque than a similarly equipped 302.
Wasn't there an old saying that cubic inches tame a wild cam or something like that? If you want drivable horsepower I'd go EFI and boost. You can make a 9:1 compression mild roller cammed 306 with 500 HP and still get decent gas mileage. A centrifugal super charger with about 8 PSI on a good aluminum headed motor will make around 500 HP and idle smooth and drive like a dream. I would definitely recommend boost if you don't have overdrive and need to drive it on the highway.
Ok so it sounds like boost is definitely something I should consider. The problem now is I already have the rotating assembly purchased and installed in the engine. They are flat top pistons, the kit is rated to 500hp, and compression ratio is: with 58cc 11.0, 64cc 10.0, and 70cc 9.6, so to get the compression ratio to 9.0:1 to run boost would I need about a 76cc combustion chamber? Also, I am not extremely familiar with turbo's, I know most of the parts needed but I am not experienced with putting them together. and if I went supercharger is there a EFI supercharger kit? because I don't see how you could get a direct port manifold or throttle body EFI setup to fit with the required needs of a supercharger. http://www.summitracing.com/parts/TFS-5170T018-C02/ These would be awesome if I go boost. hello top-end. what kind of cam is used for boost. I know they need less overlap, anything else? Thank you for the input guys I really appreciate all input seeing as every car I have built is simply so I can learn as much as I can. I am an enthusiast
Unless you're building this in an aftermarket block, I'd forget about hufffing it. You're already going to be at the block's limits with the 347. You're going to have plenty on your plate with the 347.
If he built the 347 with good parts and a main girdle he should be safe to 550 HP or so. I figure a mild cammed 9.5:1 347 that makes 350-380 HP with about 5 PSI from a centrifugal blower would work. You wouldn't see any boost till after 4000 RPM. and a max of 5-6 PSI at a little over 6K RPM would make an ideal street monster. A mild cam would love that combo and probably net some decent mileage. It's just an idea based on him wanting as much power as possible and still being able to enjoy driving it without going I completely agree you have to be careful with the factory block. 347Grabber: What gears and tranny are you running? If it's non overdrive with 3.00 gears, lots of early torque with a little positive pressure on top would make it awesome to drive. Also why a mechanical roller cam? Plus how fast are you wanting to go? 400 HP goes a long way in cars as light as ours. A guy I used to street race with had a Maverick with a N/A 306 with a solid flat tappet cam and a C-4 with a ton of gear. He ran low 11s at 120 or so. His car was all business and weighed 2600 LBS though
This whole car is being re-done so I will be running a built C4 with a 9" rear and whatever gears make the car drive the best. I was just looking at mechanical rollers because typically they are more aggressive than hydraulic. But the cam I found is a hydraulic roller that seems like it will be great for the street. I have no idea how fast I want to go. as fast as possible on my stock block? I dunno I just want to have a muscle car that throws you back in your seat. I think I'm already going a little over board. On another note, you guys are saying the 302 can only handle around 500some horses. What if I just built the 351 2-bolt Windsor that I have in there now? Again, I would probably stroke it to a 408 and just try to keep my powerband out of the top end. What are others getting on those setups? I guess I have some more research to do
A supercharger would be nice to have in the mountains, but I'd build it with a 302 cubic inch displacement instead of a 347.
I used to have an SVO Mustang that was modded. Made about 300 HP. I used to love taking it to the mountains on drives with my naturally aspirated Mustang friends. Well funny thing happened at altitude The faster N/A cars became slower than mine Boost is a good thing. 347Grabber: Since you have no overdrive and want to drive it for transportation I'd do more cubes and a lower RPM power peak. That way you could still pull 3.00 or 3.25 gears and still go 65 down the freeway. It will still be revving higher on the freeway than an AOD with 4.30 gears but it will be at least adequate. The 347 and a modest roller cam would go well with that C4-3.00 gear combo. Talk to a cam manufacturer about your combo and how you plan to drive it most of the time. Just remember the higher the RPM power peak the more gear you will need to keep your engine in it's power band. I preach the gospel of overdrive a lot on here because it allows you to have the best of both worlds. Meaning you could run a beefed up AOD with 4.30s and have the equivalent of 2.88 gears when in 4th gear going down the freeway. But if no O/D is in your future it will always be the best compromise between neck snapping acceleration and tolerable freeway cruising.
So, you're not going to be driving back and forth with it from Phoenix to Boulder ? The boosted motor would do well between those points with the wide variation in altitudes, you're looking at nearly sea level (phoenix) to 9000-10000 ft, depending on your route. EFI and boost would far out perform an N/A carbed motor in that scenario.
Ok I'm sorry for lack of info, the Maverick will be transported, not driven, anywhere I go. but for now it sits in storage in Boulder as I build the engine while in Phoenix while going to school. My DD is my modded, fun to drive, Contour SVT. The Maverick will strictly be for around town/drag strip fun.
