Need more power

[trei75bronco]

Looking to get More power out of my motor. I bought it built so have no clue what pistons were put in. I know rhis will dictate the heads. Anyone have any pointers. Would like 350 to 400 hp. Would a better efi like fast help ? Any input

[Jesus_man]

Turbo or super charger?

I'm not sure what is realistic to get out of a N/A 351. But we all know the basics...fuel, air, fire.

Can I ask why? In a crawler, gobs of power usually breaks stuff. Especially since you trailer to the trails right? Are you looking for higher RPM power or low end grunt?

[Digger]

You want usable HP or just big numbers? What's the application? What are the details on the engine currently?

[EFI Guy]

Half a BAR should do the trick.

[trei75bronco]

The motor is a mild build. Rv cam steel heads with roller rockers edelbrock performer 289 intake howell tbi feels flat. I did go to a c4 from manual so that doesn't help either

[trei75bronco]

Wh shorty headers too

[crawlercreations]

Install better heads and a more aggressive cam. Install decent multi point fuel injection and tune it properly. Or force the induction.

[Digger]

Here is Viper's desktop dyno sheet with curves for GT40 and AFR165 heads using the Comp Cams 35-349-8 cam that we are both running.



With GT40 heads, the engine is making a respectable 310HP, with ARF165s you are closer to 370HP/440tq.

The important thing is that the 35-349-8 cam is not that radical. I still get good idle and cruise quality. My previous cam probably made a little more HP, but you had to wind the engine up more to get it. That being said, my old cam is up for sale (~10,000miles on it) if you go that route.

[Digger]

Forgot to ask, is your engine a roller block?

[trei75bronco]

I dont think its a roller block

[trei75bronco]

Install better heads and a more aggressive cam. Install decent multi point fuel injection and tune it properly. Or force the induction.

How much to install headsand a cam

[Viperwolf1]

Install better heads and a more aggressive cam. Install decent multi point fuel injection and tune it properly. Or force the induction.

How much to install headsand a cam

AFR 165s are around $1600 and a roller cam with conversion parts will be near $700. Add in pushrods, rockers, gaskets, oil, timing chain, etc and you're looking at $3K.