I am looking to get more HP from my 1966 170 engine. currently have sequential fuel injection, oversized valves in a super 6 port matched head. A racer brown CCS -190 cam (duration 190 degrees@050,107 degrees lobe separation). the exhaust is a stock manifold with 2.25 inch exhaust all the way out. Would a dutra exhaust manifolds make a noticeable improvement? Not sure what my current compression ratio is. I would like it to be 9-9.5. I just had it dynotuned and rwhp was only 85. The injection is a megasquirt ms3.

Did you measure the combustion chambe volumm? If not, When the head work was done, was the head milled?
I would start by dong a compression check, to make sure the engine is in good "basic" condition.

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

yes head was milled not sure how much

send me a PM and I will give you my phone number. We can talk.
Charlie

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

A 190 degree @ .050 is only @ 4 degrees longer than a stock camshaft so that is pretty small.

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Yep, that is a stock cam. Please say what is your induction too - intake, carb, tuning on that?

Lou

_________________
Home of Slant6-powered fun machines since 1988