I am currently building a 347, it did have a f303 cam but am looking at upgrading. I have 185cc AFR heads. I would like to make 400-450 whp. I have read that most stock blocks crack near the lifter valley when around 400whp. Just looking for recommendations on better cams as well as other parts while the engine is out.
347 advice
- Thread starter CRonaldo773
- Start date
The block will be fine if you don't delete the rev limiter, which is 6250.
Custom cam for sure.
When it comes to a NA engine, 400rwhp and 450rwhp are miles apart.
Custom cam for sure.
When it comes to a NA engine, 400rwhp and 450rwhp are miles apart.
Custom cam is the way to go. What intake are you looking at? I would think the exhaust would need to be 3” and some good headers to make the 450 rwhp as that is putting you in the 525 to 550 fwhp range.
I was looking at the Holley systemax, and long tubes but am trying to find some from other brands other than bbk. Currently I am with the stock intake manifold and short tubes headers and catless xpipe. Another thing that would determine which intake manifold is whether i decide to build for boost or keep it NA
NA or supercharged is a pretty loaded question.
I think NA is more reliable.
I also think SC is better to drive.
I'd also say it's debatable on spending the money to build a 347 then adding the supercharger when the blocks limit is already 500rwhp. Personally, i'd be more comfortable with 450rwhp. The finances just don't make sense for the minimal extra gain.
IMO, one of the best driving setups is a 302 with good h/c/i and a low boost vortech. The problem is that everyone gets greedy.
Keep in mind, i would do NONE of this, without building out the suspension and brakes first, maybe even the trans too.
I think NA is more reliable.
I also think SC is better to drive.
I'd also say it's debatable on spending the money to build a 347 then adding the supercharger when the blocks limit is already 500rwhp. Personally, i'd be more comfortable with 450rwhp. The finances just don't make sense for the minimal extra gain.
IMO, one of the best driving setups is a 302 with good h/c/i and a low boost vortech. The problem is that everyone gets greedy.
Keep in mind, i would do NONE of this, without building out the suspension and brakes first, maybe even the trans too.
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