thanks d, rick, and kev. very helpful info.

so what all of you are saying is my parts arent matched correctly?

nothing is set in stone with the cam. its still sitting at the parts store. im sure they will work with me there if i decide id like to change cams..

the intake and carb, i purchased a year ago, before compression went in #3 in the bone stock 170. i have 300$ in my carb and intake. the carb is a new holley r8691. i think 250 or 280 cfm(i planned install on stock 170), intake is a 2bbl supersix in real good shape with all the brackets nuts and studs. i have the 65 cable gas pedal set up, from a 273 v8 car. i also had an egr block off plate made.

the more that i think about it, those parts seem matched well, just unrealistic for a 250hp dream.

kev, did you drive that duster on the street? if so, how often and what was it like? im pretty sure my 225 is from a 70 duster. got it for 50 bucks lol.

now im confused and not sure what to do.

i like d's block prep:

".040 overbore
Block decked for a .089deck height
Head prepped for 50 cc w/1.70 & 1.44 valves
Comp head gasket at .039 crush and 3.5" bores ?

two cams have been said.

erson 238@.50 510lift on a 108 lsa

and 280/270 111 lsa .470.

now if i prepped my block n head to d's advice, and used one of those cams, could i not use my mild two bbl intake n carb until i source the proper intake/carb/exhaust set up for the more aggressive cam, and tune accordingly?

i could try selling the 2bbl intake and carb and waiting till i source the proper carb/intake/exhaust for the more radical cams.

i could sell the whole two bbl set up, keep the cam the parts store has waiting, do head work, clean, match, and rebuild all the stock 1bbl stuff.

thanks for all your help guys, i have alot to figure out and im still very unsure about which way to go.

a 200+hp daily driver is starting to seem like my goal.


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r8691 is a Holley 2280 I believe so it will work with the Comp cam you picked and no more than 9.5:1 SCR...you will get a more out of it with the bigger holley 2300 model...
erson 238@.50 510lift on a 108 lsa = Erson Hi-Flow AM Cam and you would want to prep the block for about an 11:1 SCR and a large carb to make the max use of this cam...

and 280/270 111 lsa .470 =The Erson lumpy cam that has lots of power, but is not totally over the top to create a problem for daily driving
If you prepped the block per my homework, you would be able to use the Erson 280/270 for best effect, but would need a 4 barrel to get the most out of it (headers would help too...)...if you used the AM Hi-Flow Cam it may fall on it's face unless you decked the block more for high compression (no more regular, Super unleaded at least). Decking to about .060 instead of .089 comes to mind...

I've had more fun with that type of build on the street and tuning everything in. That being said if you do more book learning and research, it won't be enough and you'll want to see what happens in the 11-12:1 SCR range...and the 250 @ the crank...then the engine gets mean and V-8 guys start to wonder what kind of iron you punished and put under the hood to make that kind of sound (and shake their heads when they see a slant...)

Good Luck,

-D.Idiot

you should take a look at the turbo builds. they will get you the power you are after with dd reliability and still have some kind of mpg. should be cheaper too. machine shop bills add up fast.

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

alright heres another blow, i wont be able to do the headwork for the oversized valves.

an instructor at school says, he'll show me how to shave and 5 angle the head.

says we cant cut seats.

My duster is my first and only car thus far drove it to high school, work and the first year or so of college (The first motor). The duster remains my daily driver with the turbo motor and good bits, it makes frequent trips back n forth from FSU back to Clearwater (south of Tampa). My car ran fine with that cam, but it may be more than most want to drive on the street.

The 238@.50 cam actually was the second bump stick for that same motor I popped it in because I wanted more lump and cam after the initial cam I had for a year or two. The first cam was a typical erson270 that I had ground on the 108lsa if memory serves this cam is 220@.50 464lift? mine was 108lsa.
The NA motor had 100+ passes with an automatic then 30+passes with a 4speed before I broke the trans, now has a t5 5 speed behind the turbo motor.

I was just basing my opinion on the cam you mentioned it would be fine and make torque but if your after that horsepower a step up in the cam department would help a ton so long as your other mods lent themselves well to the combination.
Oh and yes my 238cam could have used more compression i'm sure and my little holley 390 (vac secondary model) really seemed to develop into a limiting factor for the big end of the track.

oh and the drivability part, the converter with the auto let me get away with the cam so drove fine felt kinda lame until you stomped it because the stall speed on the converter(did good burnouts and launched well though!). Better drivability with the stick for sure no complaints there really (OD enjoyed the mpg).
Kev

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