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Re: 512 low deck street engine [Re: fast68plymouth] #3098111
11/29/22 03:13 PM
11/29/22 03:13 PM
Joined: Aug 2011
Posts: 2,855
Pattison Texas
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Pattison Texas
Originally Posted by fast68plymouth
For me, time has changed what I feel is “streetable”.

Something I might have thought was “acceptable” 30 years ago......... is a often a no-go for me now.

I agree ^^^^^^^^^ with that said, on my 512 when it was carbed it was really to much cam for a comfortable driving street car 255,258 109 lsa, BUT with the individual 8stack it is like driving a bone stock 440, I can lock up the converter as low as 1200 rpm & smooth as glass.


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: 512 low deck street engine [Re: AndyF] #3098159
11/29/22 05:25 PM
11/29/22 05:25 PM
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
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The 440-2D when ported to max wedge is a very strong intake especially when the lower plenum is radiused from the plenum to the individual port runners. The average lower plenum runner is down 30cfm from the upper but with some sensible port work they can all flow much closer to even.

I had the ported dual plane on my 517 Low Deck with the chapman cnc'ed Stage 6's which are on par with a mildly worked set of TF270s. Motor would rev to the upper 6000's with ease even with the dual plane. I run a ported 337 intake on it now and it's even better.

i know that's a low deck but maybe a ported Street Dominator or a deep ported Performer RPM might work even better with that mild of a cam. I can run an RB manifold on mine because of the Stage VI's that dont have the cast-in spacers like the victors and TF's do.

Last edited by Streetwize; 11/29/22 05:34 PM.

WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
Re: 512 low deck street engine [Re: Streetwize] #3098295
11/30/22 09:31 AM
11/30/22 09:31 AM
Joined: Jan 2003
Posts: 8,163
Plymouth, MI
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That should be a tire frying monster with a tight converter and all of that torque available at 3000 rpm. Should be an awesome, nice driving street car!

My tolerance is pretty high for poor manners, my car has 4.30's, a loose converter and the 590 mp cam with 270* @ 50 duration so it's soggy down low and can't run power brakes, but I enjoy it overall. For something that gets limited use I appreciate the level of obnoxiousness, it's part of the fun of old musclecars to me. Assume it'll only get better with more displacement and similar duration too. New stuff has more potential and is so much quicker stock but it's a totally different experience.


'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
Re: 512 low deck street engine [Re: fast68plymouth] #3099740
12/05/22 10:20 AM
12/05/22 10:20 AM
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
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Fast,

Was the 410 a BB or a small block?

That cam is exactly the size and spread in used in my 440 W2 SB (4.06" x 4.25") which is also 10:1.

It's ridiculously easy to have fun with a reliable motor combo like that.

Pump gas no fuss big torque street motors are really the way to go IMO. And on a HP/$$ ratio the BBM can still hold it's own.

It's sad to say with the rising cost of racing and just towing to the track that very few people (relatively) are still building full-on Mopar race motors in these days of 700HP small blocks and turbo LS motors.

Settle for going just a few tenths slower and just drive your toy to and from the track!

Last edited by Streetwize; 12/05/22 10:23 AM.

WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
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