I am looking at getting a set of fully ported lt4 heads(220cc) and manifold,
what would be a good cam choice? looking to run N/A and will have all supporting fuel mods and LT's. Not a DD going to be a Street stripe car.

 

gm847 is pretty big, XFI 292, etc. or just get a big *** custom grind...

 

Really not a good choice for near stock cubes unless you want to go aftermArket management too and rev to the moon.

Take a look around and it is amazing what properly ported LT1 heads can do, and amazing the excuses the guys who went LT4/aftermarket come up with for why the car with LT1 heads is faster.

 

good point, I am mixed right now, I am thinking possibly a 383 in the near future but not sure

 

Frankly I am not convinced LT4s are even worth it on a 383. I tend to analyze data a little more than most and rely on results rather than "conventional wisdom" or popular thinging.

Most people state what is "good" based on a marketting built reputation rather than track proven results.

 

Are you suggesting that stock LT4 heads are too much for a 383 or that ported LT4 vs ported LT1 that the difference is not worth it? If the latter is the case I could agree, however a 383 with a decent sized cam can benefit from some well ported aftermarket heads, which can flow more than ported stockers and produce some extra power.

 

I am not seeing that ported LT4s or aftermarket are worthwhile over ported LT1 even on strokers, not even aggressive motors much less the street cars most of us build.

Granted everyone talks about how much better the bigger heads are but the results IMO are not there.

I have run same track same day as strokers with aftermarket or LT4 heads some ported by reputable shops and out ET'd and MPH'd them, my little stock shortblock stays below 6500 even during the shift, mechanical WP, stock damper, noting goofy or special. Car is basically full weight, the aluminum heads are far and away the biggest weight savings with the 9.5" converter being the next biggest and nothing has been done specifically to cut weight, even have a trailer hitch on the car.

I can not stress enough that there is a BIG difference between what the "forum consensus" is and what REALITY is.

 

With the stock 3.48 stroke you will need a pretty big cam to take advantage of the LT4 heads. Piston to valve clearance will most likely be an issue. An aftermarket management system is a must have. LT4 heads can make big HP on stock cube motors if you put together the right combination of parts.

Good Luck,

Daren