Alright. I just got my dyno results today. Not sure if I should be happy or not though. What do you think. Here's what I got.

315C 4V bored .30 Displacing 357 CI, Forged TRW flat top pistons, Comp Cam Magnum Hydraulic Flat Tappet Cam, stock iron heads, Edelbrock Performer intake, and a Mallory Dual Point distributor (28 deg BTDC) with MSD 7AL box. Dyno headers.Total cost $5,500

The best run was 313hp/375ft-lb @ 4700RPM. Again, should I be happy with that?

Thanks,
John

 

Those numbers dont seem to bad for your combo, a good set of heads would give you a big hp boost.

 

Since you were using dyno headers I'm figuring this is flywheel HP/TQ?

Since your build is relatively stock, why wouldyou expect bigger numbers?

313HP at the flywheel is nothing to be upset about.

Dave

 

I should say that this is for a 72 Mach 1. It's a street driven car. I wasn't sure what to think of the numbers, that's why I asked if I should be disappointed. However, I told the builder that I wanted a strong running street engine that may be taken to the strip once in a while. At one point I asked him what kind of numbers he thought it may get and he said that he thought maybe 400 for each. He did say that I would probably getabout 350hpif I ran the rpm up some more. He said that the dyno pull was conservative. And it is flywheel hp/tq.

 

Did you port/polish the heads? What kind of compersion ratio?Everything looks pretty good for your combo. Get a good set of aluminum after market heads and the combo should be good for 350-400+ at the flywheel.

 

yeah, new heads would make a pretty big difference. the stock iron heads are pretty restrictive

 

Numbers are just numbers, as long as it feels like a beast, you should be happpy

 

If I were you, I'd be happy with it. It's a street driven car, not a weekend strip car. With more HP comes more trouble. Aluminum heads probably would give you a little boost, but I doubt it would be anywhere near 50-100HP. The canted valve 4V heads were way ahead of their time and flow very well. I always found it funny that afetrmarket head manufacturers would never compare their "high flowing heads" to the Cleveland 4V heads... they always use the restrictive 2V's for their comparisons. I questioned Edelbrock about this one time years ago and the response I got was the samemisguided rhetoric that's beenfloating around for years... "the 4V heads do produce great flow numbers, so much so that it they make the motor "unstreetable".... "in order for the heads to be effective, the RPMs have to be in the 5000 and up range".

Bullcrap. When all factors are considered, the stock 4V heads are usually a better bargain than anything else available. 2.19 intake valves? Talk about flow numbers....

Igot off point.

Be happy with it. Too much motor is worse than too little motor. Your 313/375 will snap your head back if you get some good traction behind it.

Dave

 

I agree with Dave. You shouldn't have to change heads to make good power (those stock iron heads are not restrictive in any way, shape, or form), and the power you're making is certainly nothing to scoff at. To get more power, you'd probably have to put in a really windy cam, which may make the car unstreetable depending on your gearing and transmission.

 

LMAO....

Where did this wisdom come from?

The 4V exhaust valves are bigger thansome aftermarket intake valves.

Dave