I will be pulling the motor to go through it in the off season. It's clear the MPH is off for the ET. I pulled the mufflers off and only gained .5 MPH.

UDHarold talks about gaining MPH with a fuel system upgrade. I'm not sure about that, but I will be doing it anyway(it's time). I'm thinking of swapping the SRP 10.25 pistons for JE 13:1. they are the exact same 599 grams.

I will also take the heads to a local guy for flow testing and his recommendation.

Anybody running 13:1 with oval port heads?

049 heads (2.19/188)
Comp 240/246 @50 .650 lift SR cam
10.4 to 1 compression
1 3/4 headers
vic Jr. intake
Holley 1000HP
Mallory 110 with 3/8 fuel line
(Sump and a/n fittings)
4.10 gear
Turbo 400 Trans
29.5x10.5 slicks
http://home.swbell.net/kenladd/timeslip1.jpg

Some ideas:
Switch to a comp solid XE roller with 246/252 (.050") and tightler the LSA to 108 or even tighter to a 107.

Keep the fuel system if you arent running low on pressure at the top end (Are you checking this?).

Clearly you know that moving a heavy chevelle is ALL about 60ft, so, i suggest work on the 60ft, get that sub 1.40's and you'll be easily far into the 10's.

i would say definetely a cam change as well the lift looks good on what your running but i always had something in the 266 to 276 range dur. @.050.
and fuel volume is as critical as fuel pressure if not more, i'm thinking (1) 110 pump and a 3/8 line is a bit conservative, i'd go with a pump that will get you more like 280gph and a #10 supply line. and then you probably will have to step up the headers, to 2 inch, and 13to1 should be good, you know those LS5 and LS4 super stocks are running more than that :D

What converter are you running.......What are your shift points and what jets do you have in right now...............Have your heads been ported at all ....I also would say if your not shifting this thing over 6200 or so then a dual plane will help with the 60 ft although a 1.50 is pretty darn good ......If your heads are done up and you go to a bigger cam then I would leave the single on there.....I would not go with a 13.1 ....you can run low 10.'s with the 10.5 you have now.......I agree a bigger cam will help ...

I would also question what converter is in the car?

If it were me, I'd keep your pistons & compression. Install a Comp XR286R-10 street roller cam, possibly have it custom ground on a 107 LSA like Ed (racer1320) and myself run...great cam for use with ovals and building strong midrange power.

The specs of the shelf grind are .653/.660" lift, 248/254 @ .050, 286/292 gross, 110 lsa installed straight up on a 106 ICL (4 degrees advance ground in)

The custom version shares all the same specs except the LSA is tightened to 107 and the 4 degrees advance is NOT ground in...installed on a 107 ICL.

If your converter is questionable, I suggest talking to ATI or Coan...both top quality pieces. I myself run an 8" ATI Treemaster that flashes to 5200.

Those two changes and I have no doubt your ride should run mid/high 10's.

Kjett also runs the XR286 Comp Street roller cam...picked him up as well over a hydraulic roller.

EDIT: I do feel your 110 pump is marginal for your power/ET range...a Mallory 140 or larger fuel pump (I run a Comp 250 myself) would be a wise investment as well as running a #8 hard line up to the regulator.

I'll have to admit I don't have a fuel pressure gauge. Any fuel problems that I have run into in the past have resulted in a surge or totally falling on its face. My runs are steady with no symptoms of a fuel starvation problem.

The 1000HP has 84 front 88 rear with the rear PV blocked off. The ATI 8" converter stalls at about 4500. I let it shift on its own from 1st to 2nd (about 5700) and I shift to 3rd at 6200, this has resulted in the best MPH and ET. I have tried higher and lower shift points.

I'm going to have the heads flow tested on a super flow next week. I'll post the results and his recommendation. 13:1 doesn’t seem like a big deal and I think it should gain about 60 or so HP and Torque, also allow for bit more cam. JE does have the 11.6 pistons that I'm thinking about also.

Todd
I did go with the 8" ATI as you suggested earlier this year, it did gain about a .15 all the way around. I am very pleased with it, .15 doesn’t sound like allot but it is more consistent. Thanks!

Also, I am still planning on the cam but I want to flow the heads before and decide on compression first.

The fuel thing is about volume and supply you probably won't feel a problem you just see an et slip in your hand with poor MPH. might explain why your car only picked up 1/2 mph with no mufflers. just speaking from experience, i ran 1 blue holley pump for years and wondered the same thing, and when i made the changes to increase fuel delivery, wow the car picked up 3 or 4 mph. there is a reason why you see BG400 pumps on cars other than pro stocks

Triplblack78......When you went to a BG400 from a holley blue did you make any other changes line size etc......I am running a blue and I too am suffering with a low MPH.....10.83 at 120.83 best MPH of 121.17....Thanks..Scott.

gateway....How's that 1000 on the street ?????

Also....Put a glass hood and some nice summit racing seats in your ride and you will pick up another tenth.....I did...NICE NICE car you got there..... graemlins/beers.gif graemlins/beers.gif

Well I didn't have a 400 pump on my car,(sorry if my comments were misleading)i just meant that alot of guys do run them in cars of which we are speaking about. i only switched to two holley blues and ran two seperate regulators, 1 for each fuel bowl, cost effective but complicated. to do it again, i would get 1 big $$$ pump and 1 high dollar regulator to match. smile.gif

I have had many carbs, and the 1000HP with annular boosters is the most responsive carb yet! I will say though, that I did not pick up ET over the 950HP with "drop down" boosters.
Very nice carb.

Carb jetting is wacked. The spread should be around 10numbers if you run a front PV, and a blocked rear, your only at 4. Its either rich in the primary and lean rear, or plain fat, lean or fat will lay over at the stripe. Tune the carb

The car should pull third gear like first gear, you run 95 in the 1/8 and only 117 at the stripe should be 120+. You have 3MPH on my 1/8 but at the stripe I have you at 3mph.

sounds like the front is too fat as 1bad67 stated,drop it down 4 numbers as a start and check your results at the track.

Your not going to gain 60hp from the compression change, 20 maybe. I would just mill the heads a little bit and put the solid roller in it that everyone is saying.

Nice running car! Its a tough call. IMO you are close to maxing out a couple of things in your combo. The fuel line size and cam, your header diameter might be holding you back a little also. Since you plan on stepping up you power I would put a gage on the fuel system and make a run to see if it holds fuel pressure throughout the run. My guess is your engine makes great mid range power and that makes your car ET well, but is running out fuel,cam, exh on the big end.

i agree with 68chevelle533. the line size might be ok with a better pump, i dunno for sure, but i'm running more fuel pump than that on my mild small block. i know alot of guys here run the 1 3/4" headers, but why? i don't understand the benefit of having primary header tubes smaller than your exhaust valves, seems like a restriction. only place it's gonna help is down low, and when you're launching off the line with an ATI 8" convertor, i'd think you're already in the torque range of a set of 2" headers. i 60fted almost that good with a mismatched convertor, a camshaft that was 260/270 @.050, and i big single plane intake, with 4.10 gears and hooker s/c's 2" primary tubed headers. i could only come out at about 3200rpms. i think there are alot of guys on here that could pick up with the larger headers. just my .02

GateWayRacer,

I tend to agree with the others regarding carb jetting. Just as a reference I run 77f/78r jetting in my HP-950 with 3.5PVs front and rear. Have you ever done a plug reading at the track? I run the AR series autolite plugs and they are much easier to read than a stock type plug. To get a good reading you need to shut the engine off as soon as you cross the stripe and coast into the return road. Sort of a PITA but can tell you lot's about what your engine is doing at RPM under load. The only other way to tell is with some sort of data acquisition to get individual EGT readings.

What LSA is ground into your cam and how is it installed?

I honestly think you should be running 98+ through the 1/8th and 120+ through the 1/4 with your combo. As you know your 60' time is carrying your ET. I pulled a timeslip from my car with an ET comparable to yours to use as a comparison. Here are the incrementals:

60' - 1.576
330' - 4.549
660' - 7.062
MPH - 97.82
1000' - 9.249
1/4 - 11.108
MPH - 121.19

You're ahead by .07 in 60'. At 660' that margin is .06'. Between 660' and 1,000' that margin is reduced to just .01.

I run the same pump that you do with -8an line (1/2"). What's really puzzling to me is that you're pulling almost 22 MPH on the back half of the track. These are decent numbers. Depending on weather and tune my car will pull between 22-25MPH on the back half of the track.

I would play with the carb tuning and possibly timing a little more before scrapping this combo, which I think is a good one.

The cam is the off the shelf 110 lsa 106 icl, installed on 106. I think it's the heads that are the restriction. If that's the case, more cam will just cost me ET. I'm taking the heads in to have them flow tested this week. That should give me base to make a decision. The fuel system will be upgraded, If that was the problem then the cam/header/compresion change will be even that much better!
:D

Ken, what size headers do you have?

GWR...

I'm running Hooker Super Comps with 2" primaries, 33" tube length and 3.5" collectors.

im running right at 13 to 1 compression on my 454 thats .060 over with oval port open chambered heads that i ported myself(have no idea what they flow) with 2.19/1.88 SS valves/20 degree back cut and 3 angle valve job and triple springs.........im also running an off the shelf doug herbert cam part number b6h 256/268 @ .050.683/.685 lift.......my cranking compression is an awesome 270 psi. it is topped off with a over worked 850 holley that i preped myself with adjustable jets, seated being 80 and all turn out (about 14 turns)being 90 i run it with 8 turns out all the way around there are no power valves in this carb......it is sitting on a victor jr intake straight out of the box.......

th350 with a 10" tci stall that gives me a foot brake stall of 4500 rpms and running 4.56 gears

my combo right now is all over the track on my launch it is far to being consistant........i have managed a one time best of a 1.52 60 ft time(most are in the 1.60's) with it bouncing around loading and unloading and i have manage 126 mph trap speed my e.t. has been from the 10.80's to low 11's........

i only took it out once early this year and have not been back since.....there is to many things wrong in my suspension(stock with traction bars) and i have a smoke issue to deal with.

i run mine with a set of cheap summit headers (open) have not tried any other size yet...

and it is taking on 7000 rpm shift points with me crossing the line between 7000 and 7200 depending on how my pass went.....

it is a scary ride for sure.......im still running with out a roll cage and i got my warning out at the track when i ran...

i put my car up for the summer because it seem to be a very long list to rework and rebuild that i focused on something alittle cheaper my daily driver fun ride.......

but next summer i will tear into it and get my combo worked out and safety upgraded for me and every one else.......i met my goal for running 10's on the motor so it was easy for me to put it away........til next year...lol

im also running 1/2" fuel line (from summit) from the gas tank to the fuel regulator and 3/8" from the regulator to the carb and nitrous plate with a fuel gauge reading 7 psi all the way down the 1/4 .............im running a holley blue pump just off the gas tank........nothing else seems to be good enough so far.....same set up i have used from when the car was running 12's and 11's on the motor and 10.90 passes from nitrous...at 124 mph