Sorry if this is a little lame, but I am trying to learn.

True or False:
1) Burning you own Prom will help your Stock TPI car
2) Easiest way to port intake is to match with gaskets
3) 1.6RR are worth buying for stock 5.7 TPI cars
4) Cams that are not street legal will make you fail emissions


These were just some of the things I was thinking of and wanted answers.
Thanks
Brian

 

1. True, if done correctly.... you could also make it run worse I'm sure.

2. True. Although, that doesn't necesarily mean matching the ports to the gaskets; only that the gasket is a simple measurement tool for porting the head and intake identically, for no flow disruption at the transition.

3. True, if you have stock rockers. Getting rid of those rubber things is the main improvement; I doubt that there's more than a couple of HP in the difference between high-quality 1.5s and high-quality 1.6s. There's probably 12-15 HP in getting something in there that makes the valve motion mirror the cam profile though.

4. False; it is possible to pass emissions with a cam that isn't strictly emissions compliant, depending on what you mean by "pass emissions". Obviously the more "radical" of a cam you run, in general, the harder it will be to pass. If all you have is a tailpipe sniffer test, it's easy. If you have a visual, and the inspector thinks there might be something non-stock in there, it's a little tougher. If you have to produce a CARB # for the cam and show it to the inspector, it's virtually impossible.

 

Thanks, your response was very informative.
A couple more questions.
True or False:
Putting in a 400 crank will make my 350 a 383
I can thow in a 400 crank into my 350

And finally, what is the difference between a 350 crank with a 3.750" Stroke, 5.7" rod and a 400 crank with a 3.750" Stroke, 5.7" rod?

Thanks again

Brian

 

400 main journals are larger than 350 main journals, so you cannot put it into a 350 block without cutting them down. Also, a 400 crank is "flat cut" across the middle of the counterweights because 400 rods are only 5.56" long, which doesn't leave enough room for a full circular counterweight, which means the counterweight can't be heavy enough, which is what makes them require external balancing.

Putting a 3.75" stroke crank in a 350 block, along with boring it .030", makes a 383. As said above, this can only be done with a modified 400 crank, or for an aftermarket crank designed for it, with which (unlike a stock 400 crank) the motor can be internally balanced if other parts are correctly chosen.

A stock 400 crank does not use 5.7" rods unless also used with non-stock pistons. However many "383" cranks, designed to go in 350 blocks, and the pistons designed to be used with them, are intended for use with 5.7" rods.

 

From the original post- agree with RB down the line.

From the second set of questions:

True, almost. 400 crank (3.75" stroke) will give you 378ci with a stock 4.001" bore. Most people bore out the block .030" when doing this so that will give you 383ci.

False. A true 400 crank has larger main journals than a 350 crank does and so won't just drop in. You can have them turned down or better yet, but a crank specifically designed to make a 383 out of a 350. Even then, you will almost always have to grind away at various portions of the block to make the rod bolts clear the botoms of the bore. AND..... the tops of the rod bolts may have to be ground down slightly to clear a few cam lobes. Building a stroker is never as easy as bolting together some parts.

The difference between a 400 crank and a 350 crank with a 3.75" stroke is probably pretty obvious from the previous paragraph- main jouranl size is different.

 

If you put a 400 Block in a 350 block you will get a 383(assuming you bore the block .030 over), but you have to machine the mains down to 350 size so it will fit. It will also require you to buy new pistons for the setup. and possibly clearance the block...

You can use stock 5.7" rods or aftermarket 6.0" Rods, all you need to do is make sure you get the pistons that are made for the length rod you are goin to run.

 

Wow... 3 nearly simultaneous posts on a technical subject, that all agree!!!!

This might be a first.

 

We rock....:rockon:

I have been out of V8's for almost 3 years, its good to talk about what i love and know again..lol

enough 4 bangers and turbos

 

thats because hes asking questions that envolve facts and not opinions.

 

OK, since we are all getting along so well, Ill keep it going.

Is there a way to increase cubic inches without a bore or stroke or whatever? In other words, is there something(s) to add to pack on the ci?

Brian

 

No. You can only make your current size power plant as mean as possible... but as far as augmenting the displacement, bore & stroke dictate that exclusively.

 

a turbo or supercharger, at 14.7 psi wouldnt it theoretically double your engine size?

 

More cylinders.

 

smilar effect.. yes... IF its a positive displacement 'charger..

otherwise, it has to spool up.....

 

Not quite; there's also the number of cylinders. If you could figure out a way to weld a couple of more in there somewhere....

 

Thats what they did for the viper Seems like a good idea to me.

Brian