i was wandering if a 400 ci engine with a 350 crank would be a good match with tpi? any comments would be great.

 

i'm pretty sure that a 400 with a 350 crank falls into the big bore short stroke category that means it is a high revving engine so you can't make as much power with a tpi as you could with say a miniram or superram or carb.
Andrew

 

thanks for the repley!

 

i'm not saying you can't make awesome power with it.
i'm just saying that you can see more from a different intake.
the regular 400 with the 400 crank would be a killer torque monstor if you can port the base enough to get some decent flow
Andrew

 

the 377 being a high rpm motor (7800 rpm on my friends) i would say no. tpi is usually good for 5500 rpm and under hi torque applications. it would run fine and do ok at the lower r's though. madmax said he got his 350 to pull power over 7000 rpm's with a heavily modified base manifold. so it can be done (great sleeper) but there might be a better (easier cheaper) way.

 

There is more to pulling high rpms than just the bore/stroke combination. Without an intake, heads and cam that can support those higher rpms (along with a bottom-end), you'll not see the benefits.

On CHP's 377 vs 383 (October 2000), the 377 only produced a peak HP of 3 more @ 6,1000 rpm vs the 383s peak HP @ 6,000 rpm. What was apparent from the build up is the 383s superior TQ EVERWHERE below 5,000 rpm.

A TPI would NOT be the intake to use with a 377 and I don't think a Superram would either (as it is limited to 6,000 rpm). You really need a Miniram with some large port high flow heads (like 18*) with a mechanical roller cam of 250+ duration @ .050. Now that engine will rev probably to 7,500+ rpm - a dandy race motor, but not very good for the street.

I should point out that if CHP had used a different set of heads and bigger cam, the 383 would have made even more power and pulled higher revs. You can make a 383 that will make power past 7,500+ rpm, but it too will be more of a race engine. Just make sure you are clear on your intended purpose of this engine and not "bragging rights over beers with the buddies".

 

Actually, the setup I have makes power past 6000, but felt pretty good up to 7000. Whether or not thats the ideal shift point (doubtful) it wasnt choking on itself.

As for a 377 with a TPI, thats sorta like a 302 or 327 with TPI except you are asking for even more air than one of those. TPI's really dont like that too much, the port sizes are small and as such, trying to suck all that air results in too much velocity. A 350 with a 400 crank would work better with a TPI.