Building a S̶t̶r̶o̶n̶g̶ ̶3̶5̶0̶ 383 for Frank the Tank…

JimmyDuncan said:
I hear you Brian.. I’m sure I could spend any amount $$$$ and still want more.. ;) I spoke with the engine builder this morning about a rebuild and he thought it should be about $2k + the block to rebuild, reusing as much of my current parts as is sensible.. he’s doing some firmer sums for me this week hopefully..

I really appreciate your input Brian, and no rush on the advice mate. Just me getting excited and stressing a little.. :rolleyes:

I’m hesitant to spend anything on the diff at this stage.. the 3.3:1 seems to be in the sweet spot for bearable rpm at 60-70 mph.. I thought I saw somewhere Grumpy suggesting that th350 trans gear works best in that diff range..?

So, maybe I’m only asking if there is a significantly better cam that would net me some 10th on the track rather than reusing mine if I can..?
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1/10 th is not much of a gain.
A full 1/2 to 1 second ET less is a Big gain.
 
Need to look at the Pro Max Heads again Jimmy.
Airflow files.
Higher lift cam or 1.65 Ratio Rockers.
Power made in SBC with Heads mainly.
 
JimmyDuncan said:
That's an interesting idea... thanks.. Would you do this instead of say the Moroso Ceramic sealant..? Do you need to remove antifreeze first..?
Click to expand...

I have used it many times and it has lasted many years and it is probably cheaper than the Moroso stuff. No, you don't have to remove the antifreeze.
 
Do you have those heads already? If not you would be much better off going with the Promaxx 200 Max series on the 383.
I switched to the 200's last year and the WOW factor needle went way up!
 
Porting your heads for a 20 CFM gain should fairly easy to obtain Jimmy.
Give a 40-50 Hp increase.

For a 40 -100 cfm gain or more you need to hire a Pro head porter.

Don't want to give you a Danger Zone cam.
Too many problems come up.
Have to run the Best parts also to do it and not blow up.

The Basic Crower Cam grind Grumpy gave you years ago is A-Ok.
280 advertised.

It's also used in the street race boost world as a baseline profile to work with.
1000+ Hp can be done.
280 advettised.

You can see on my latest thread it's true.

http://garage.grumpysperformance.co...t-home-1970-firebird-espirit-350.15365/page-2
 
Unforgiven said:
Do you have those heads already? If not you would be much better off going with the Promaxx 200 Max series on the 383.
I switched to the 200's last year and the WOW factor needle went way up!
Click to expand...
Yeah, I have the heads already. I have been pretty happy with them. But, maybe you're right that the 200s could have been better..
 
Maniacmechanic1 said:
Jimmy what Brand of heads did you buy again ?
The E/I Ratio is perfect as is.
Right on for NHRA SUPER STOCK No Power adder.
You had real close to 450 actual Hp likely.
The Flow area is actually stated well...
Most of it in a Street engine is .050"-.400 " valve lifts . 99 %.
Click to expand...
They're Promaxx 2171 Brian.. I have a vague memory of hearing that they used to be called Patriot or something..? But, could be wrong..

https://promaxxperformance.com/
 
JimmyDuncan said:
They're Promaxx 2171 Brian.. I have a vague memory of hearing that they used to be called Patriot or something..? But, could be wrong..

https://promaxxperformance.com/
Click to expand...
I think this is the basic head Chad Spier uses.
He is on Facebook has his own page.
A professional head porter in Kansas USA.
He is real good with SBC.
Pulls out 430 CFM from 23 degree heads.
Has a killer flow bench he tests on.
Think he had it custom made.

He also knows when to back off on head port flow and concentrate on Velocity.
Can not move any air without Velocity.
Physical impossible.

Enough air flow as is to support 480-520 as is your heads in theory.
Try and make time this coming weekend to DD2000 for you.
230 @.050" basic spec.
Try different LCA Lobe centerlines.
Crower grind you have is very good.
Good thus far.
Maybe find more without going full race.
Should.
 
Alright Jimmy.
Going to try an engine simulation with my old DD2000.
Everyone's own version of engine simulations will differ some in results.
Pipe Max is regarded as the best but I don't have it.

Have to find your old Crower Cam used in your thread 1st.
Need to make a baseline to work with.
 
You Have the Pro Max Series 1 185cc intake volume runner heads with 72cc chambers & straight plug option.
Oddly enough Stan Weisse does not have your head on his website airflow data base.
I got the full airflow chart from Promax.
 
Working on the baseline simulation Jimmy.....
ITS A CROW CAMSHAFT...NOT A CROWER !
I Googled.
Do the best I can here.
 
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