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383 Pump Gas Combo...

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chvl71402

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Discussion starter · #1 ·
Hi Guys,
This is a video of a pump gas 383 I helped put together for a friend.
factory roller block
AFR 195 Eliminators
Comp HR294
Super Victor w/750 DP

Ran 6.4 in the 1/8th at 105mph
Gotta love the car it's in!!


Dave
 
#5 ·
That converts to a high 9 second 1/4 mile run with everything perfect. That's similar to an old combo that one of the other guys here used to run. It ran high 10's in the 1/4 in a heavier Chevelle. Had valve spring issues with the xr294hr I think. 383 guys should take note! Combo works.

Your friend have any issues with valve springs?
 
Discussion starter · #7 ·
The AFR 195 Eliminators use the LS style 8mm valves with dual 1.28 springs and titanium retainers.
no issues with springs or valve float, has turned it to 7200.

Dave
 
#8 ·
Rmchevelle said:
That converts to a high 9 second 1/4 mile run with everything perfect. That's similar to an old combo that one of the other guys here used to run. It ran high 10's in the 1/4 in a heavier Chevelle. Had valve spring issues with the xr294hr I think. 383 guys should take note! Combo works.

Your friend have any issues with valve springs?
Click to expand...
ya that was me. with the older style afr heads with the golf club valves. 6450 and it was done. 10.85 and floating the valves.
6.40 is impressive for sure wish you had the weight.
Dave
 
Discussion starter · #9 ·
He has not scaled the car. I believe it is heavier than a stock '57 with the roll bar and Dana 60 and frame stiffening pieces, plus 210lb driver... anybody know what a stock '57 vette weighs with 283? Anything I say would be a guess....
 
#12 ·
sheetmetal said:
ya that was me. with the older style afr heads with the golf club valves. 6450 and it was done. 10.85 and floating the valves.
6.40 is impressive for sure wish you had the weight.
Dave
Click to expand...
Dave, glad you chimed in. Congrats on your new bests. I'm curious if there is a spring that would have solved the issue but I'm sure you looked into it.

chvl71402 said:
The AFR 195 Eliminators use the LS style 8mm valves with dual 1.28 springs and titanium retainers.
no issues with springs or valve float, has turned it to 7200.

Dave
Click to expand...
Are those the AFR supplied springs and retainers?
 
Discussion starter · #13 ·
Yes, AFR supplied springs and retainers these are the standard springs the come with the 195's just added the retainers to the order per Tony's suggestion.

Thanks
 
#14 · (Edited)
That car is flying...with a hydraulic roller no less!

Very impressive indeed....

As another member noted that is the equivalent of a high nine second/looooow 10 second pass (my correction factor pegs that run at 10.0 at like 132 ish in the quarter).

Even if the car had a raceweight of 2800 pounds you would need 530-540 HP to run that number....if its heavier it only gets better (add 15-20 HP or so for every additional 100 pounds).

Are those the street or the Comp 195's and what was the static CR?

The new 195 heads have been producing spectacular results on 350-400 CID combo's....especially those that nailed the rest of the set-up as well.

Would love to get pics and documentation of this car on our testimonial page....the results speak for themselves.

:beers:

Cheers,
Tony
 
Discussion starter · #16 ·
Tony,
Be glad to send along some documentation of the combo w/pics.
The static C/R is 10.6/1
The heads are the street version, the CNC versions were not available when we put this together.
Rear gears are 4.56's with a 32 inch tire.
TH350 with a TCT converter.

Thanks
Dave
 
#18 ·
Rmchevelle said:
Dave, glad you chimed in. Congrats on your new bests. I'm curious if there is a spring that would have solved the issue but I'm sure you looked into it.

Are those the AFR supplied springs and retainers?
Click to expand...
i thought about going with a behieve spring but John talked me into the solid roller and have no regrets. Rafel has been twistin my arm to go to a different set of heads and with what this vet is doin it sure looks inviting.
i wounder if there box stock or have some work done.
Dave
 
Discussion starter · #19 ·
These are the "street" version, box stock other than the retainer upgrade....
We are pleased with the performance and no need for maintenance with the hydraulic roller setup and runs pump gas. Certainly worth a look if your building a 383.

Dave
 
#20 · (Edited)
sheetmetal said:
i wounder if there box stock or have some work done.
Dave
Click to expand...
Even "box stock" the 195 street heads flow as much as our former 210 heads (about 285 CFM) but do it with a significantly smaller cross section (more air speed/inertia for better cylinder fill) and the big numbers come at an earlier lift point allowing much more air in total to enter the combustion chamber. If you have 285 CFM available at .500 lift versus .600 lift the engine spends alot more crank degrees "deep breathing" getting the most from the cylinder head's peak airflow potential.

At the typical (but reasonably accurate) 2 HP per CFM rule, that type of airflow has the potential to mak at least 550 HP which is about what this combination looks to be making on paper based on its performance.

-Tony

PS....The 195 Comp heads cross 300 CFM @ .600 lift....and still have an actual pour volume of 196 cc's. I bet this combo would have been a tenth or two quicker with those but you cant deny the value inherent in the less expensive street version (still 100% CNC ported).
 
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