Mild 396 build

[Sand hauler]

Finally got the little 396 built and on the dyno. A big special thanks to Brent Lykins for the help and cam he ordered for me. As well as my buider Mike Elmore and machinist Leo Evans here in Carlsbad NM. 10:1 flat tops, streetmaster intake, 750 vac sec Holleystock rods and crank, c-8aeh heads with stock valves .  383hp at 5200 and 422 ft# tq @4400 with torque curve of405@2900 to 394@5100. Couldn't be happier with it , oh and it's going in a 1975 F-250 4spd  highboy w/ 4:11 gear and 35" tire .

[frnkeore]

Great number for a mild build!!

Have you thought about trying a 600 CFM carb?

[Sand hauler]

Yes, thought about it, however the throttle response with the 750 and single plane streetmaster intake were nearly identical to the 650 and dual plane preformer that we decided to keep it instead .Cam is 228/236@.050 , 107/105 ,.556"/.570" lift from Brent

[Stangman]

nice good luck

[DuckRyder]

Nice numbers.

Is the cam a roller?

[blykins]

Nice numbers.

Is the cam a roller?

It's a hydro flattie.

[blykins]

Lean her up! 

[Falcon67]

Nice - and yes, looks a bit fat on the numbers

>throttle response with the 750 and single plane streetmaster intake were nearly identical to the 650 and dual plane preformer

LOL - One of those things the internet will fight to the death over but I've verified same many times, especially with milder cam timing.  I personally prefer a nice 650DP as an all around, on pretty much anything. 

[Sand hauler]

Update, although I don't have any sheets in front of me, I did receive a call that after alittle more tweaking, changing the Jets from 72 in the front to 69's and switching to the 10/30 weight oil from the 20/50 it had initially, he found another 10 horses . Had the fatter Jets and heavier oil ,for a little insurance. Maybe not the way everyone else does it,but .... Figure there's still alittle more,but going to call it good.

[blykins]

I figured you'd be close to 400 hp.  Thumbs up.

[frnkeore]

Lean her up!

I think a 600 or 650 could do that, using a air correcter metering block.

For a street engine, vacuum secondary's would give better mileage and better throttle response, with the right spring. 

[blykins]

Lean her up!

I think a 600 or 650 could do that, using a air correcter metering block.

For a street engine, vacuum secondary's would give better mileage and better throttle response, with the right spring.

I think that 750 is the right choice here....just needed a few tweaks. 

[frnkeore]

But, the engine can only pump 596 cfm @ 5200, if everything flows perfectly.

I'm not for undercarburating but, for a street engine going to far the other way, won't keep the fuel, in suspension as well. The vacuum secondarys, limit over carburation to a degree but, I think having more control of the air and it's velocity is better way.

[blykins]

650's are for 289's. 

[frnkeore]

Yes, 289's at 8000 rpm

But, on a more serious note, do you agree that the mid range can be cleaned up and produce more HP, using air corrector jetting?

Street engines are way different than all out race engines but, even race engines, need the right A/F, in the range they run in, even if it's only 1500 rpm.

For a race engine, you give it all the carburation you can, until the HP drops off, in the range your working in. In the engines that I had dynoed, they jet for max HP and then, come back with the air correcting jets, to bring the mid range in.