Re: suspension/gearing/slicks
 

But like I said super73 the sooner to 3rd the faster he's going to go


I didn't think I was disagreeing with that.. Using all three gears and getting him to cross the line right in the max RPM window, is going to net the fastest ET.

Gear it to cross the traps 100-200rpm before redline.

Re: suspension/gearing/slicks
 

so basically gear it with 5.13's and play the tallness of the slicks to get the right combo.....

gotcha....

thanks guys.

Re: suspension/gearing/slicks
 

Naw super I did not mean anything by it just want you to put your opinion in And get your thoughts
Now look at his cam specs and see what you think?

Re: suspension/gearing/slicks
 

5.13 in a 10 bolt 8.5 is getting pretty small on pinion size . Just something to think about with a 12.92 ratio and a big tire .

Re: suspension/gearing/slicks
 

Cam would be good to grow in to with a set of good heads and some decent compresion.. For the average semi stock head, and 9-1 or even 10-1 static compresion, I think there are better cam designs out there using comps book of lobes and specing one out..

Re: suspension/gearing/slicks
 

look back up at the heads that will be going on the car, and i've stated that i have 11-1 comp now.

guys i will not be drag racing this truck as it sits now, engine or suspension wise.

i will already have the brodix heads, the cam, intake, carb, suspension all done before next track season starts.

should i look for a 12 bolt to go under the truck? where can i find one out of that is 5 lug and the width i need?

Re: suspension/gearing/slicks
 

if you don't want to do the rearend but once put a good 9 inch for in it! I would get moser 35 spline axles and a spool.

You could make a 10 or 12 bolt work short term but not in the long run. plus when you break the 10 or 12 bolt the wheel can come off and destroy a bed side.

Re: suspension/gearing/slicks
 

gotcha

Re: suspension/gearing/slicks
 

So with out knowing everything about your set up, I took some guesses and this is what I have come up with based on the info you provided. Please feel free to correct anything and I'll be happy to make a few adjustments..


http://73-ls1.com/67trucksetlist/85sbc400.JPG




This is based on a 11.02-1 cr using:
62cc heads
-10cc valve relief flat top pistons
Pistons sitting -.01" in the hole
.043 thickness head gaskets
Bore of 4.02
Stroke 4"

1.5 rocker

1 5/8's headers



Do you have any idea what the intake centerline is on that cam? That is going to dictate dynamic compression and should change the curve slightly.

Re: suspension/gearing/slicks
 

Here is an overlay with some changes.. I played with header diameter and length and this is the best I came up with. Leaving your cam selection and head selection alone still at 11-1 cr..

Changed the program from a 1 5/8 24" long header to a 1 3/4 30" long header
Changed from a 750 carb to a 1050 carb
Switched from a 1.5 rocker to a 1.7


http://73-ls1.com/67trucksetlist/85sbc400_revised.JPG

Re: suspension/gearing/slicks
 

thats going off the parts i listed that i'm going to be putting on the engine or thats going off my engine as it is in the truck now? and what does that mean on the bore of 4.02? i thought the smallblock 400 hada bore of like 4.125? i'm probably way off or i just dont what you ment by the 4.02 part.

the cam now has a 108 lsa i believe. i hate nto knowing anything about the cam in this engine now. thats why i'm going to go ahead and swap it out with something else so i KNOW exactly what i have.

Re: suspension/gearing/slicks
 

super whats the program with the blue graph ?

Re: suspension/gearing/slicks
 

That's going off the brodix heads and new cam combo at 11-1cr. Changing to the correct bore (So used to LS1 bore stroke combos)

http://73-ls1.com/67trucksetlist/85sbc400_revised2.JPG



Rodms,

I'm not sure I understand what you mean..

Re: suspension/gearing/slicks
 

good deal, thanks man.

should be a pretty good runner then. i may decide to go witha little apray later on. thats still up in the air though.

Re: suspension/gearing/slicks
 

I would really try to find a set of 1 3/4" headers aprox 30" primaries before the collector. That seem to make the biggest difference.. Carn going from a 750-1050 showed about a 7-10 pick up. But the headers fixed the low end TQ and made power.

Given it's a computer telling the numbers, but it was pretty spot on with all the LS1 stuff I've put together.

Re: suspension/gearing/slicks
 

yeah the headers are going to be changed out.

i guess i just need to call some header shops and find a set closest to that?