[grandville455]

Originally Posted by ponjohn

He mentioned that this combo pinged in the street thread.

I have never heard of any of these OF combos pinging. So it is possible the carb is not tuned correctly.

I also seen that, I also wonder y he set it at 110 centerline instead of 108, being later it shouldve picked up on top even more, I would seriously be looking at the carb and whats going on there, sounds like he has enough fuel, even with a gauge wont always tell u at WOT, mine said i had 6 thru full run, but would never show a jet change on my meter, then i tied both holley blacks together as they only have -6 lines running up front and same pressure but now it showed a jet change in afr, u can have pressure but not volume.

[71 T/A]

Engine doesnt ping. it did at 16 initial, backed it off to 15 and its quiet.

Spoke to Cliff who was nice enough to leave what he was working on to talk to me.
He said go with 1 inch spacer n different 950 carb. Shift much lower starting at 5000 and test that at 100 rpm increments to 5500. He also says keep 3200 Continental converter but go full 3 inch exhaust not half 3 n half 2.5 like i have it now,

[Skip Fix]

When I ran NMCA there were guys in the 10s with the required 2.5 tailpipes.3" will be a little better as you get to the higher performing limits of the motor.

My motor makes 550HP+ with just a 1.4-1.2 taper spacer(for the Shaker scoop) on that intake. No spacer is not a big factor in the whole picture.

If you ping at 16 and just don;t hear it at 15 I would bet there is still some detonation going on as most you can not hear.

[grandville455]

Originally Posted by Skip Fix

If you ping at 16 and just don;t hear it at 15 I would bet there is still some detonation going on as most you can not hear.

^^^^^^^ exactly what i was thinking when i read that.

[71 T/A]

Originally Posted by Skip Fix

When I ran NMCA there were guys in the 10s with the required 2.5 tailpipes.3" will be a little better as you get to the higher performing limits of the motor.

My motor makes 550HP+ with just a 1.4-1.2 taper spacer(for the Shaker scoop) on that intake. No spacer is not a big factor in the whole picture.

If you ping at 16 and just don;t hear it at 15 I would bet there is still some detonation going on as most you can not hear.

Maybe not because I pulled the original distributor and dropped in an msd pro billet and 6al2 box so that could have helped. Stock original one with Pertronix was not holding timing steady anymore with timing shifting a bit.

[charlie66]

Originally Posted by grandville455

Ok I get that and the et makes sense shifting sooner, but not the 60 ft, I don't see how someone can gain 60 ft if shifting after the 60 ft mark wether its your combo or another, and i surely would think your combo being less mild then mine is after the 60 ft is all i'm trying to say. I believe Jim Hand used to shift around 90 ft i think in his setup?

Is the 60 foot mark the first Orange marker in between the lanes in the middle? I did shift before that.

[stroker461]

My personal opinion is send your carb out to a well know builder, as Brian said BIG RED FLAG when ya pulled scoops and slowed down, seems it only got leaner, do I think you need more carb than a 950? NO There is something going on there for sure, so get the carb fixed... Second get rid of the 2 5" portion of the exhaust, I honestly dont see the point of running 3" then dropping it to 2.5", why restrict it? Riding around town may not make a $**t for difference but your asking/ complaining about your E.T so throw it out, as cliff recomended a spacer on top of your torker 2, I believe thats a good idea but not gunna do anything unless carb is in good working order, dont think that you may be able to drop a spacer on and its problem solved, because it wont be, reason why is because you'll be gaining plenum volume by adding the spacer and if your carb isn't supplying the amount of fuel that it should if working effecintly and add spacer it will only make the engine probably run at a leaner condition than you are now, my personal opinion I would try a 4 hole tappered spacer, start with between a 1" -1.5" reason I say that cuz 4 holes tend to keep that low end where as a open spacer is intended more for top end and your suffering on the low side, also as far as the ping at 16 but not at 15 you most likely still have detonation but then again could be because of lean condition, get carb checked out play with spacer make test passes shut down at end of pass and read plugs dont let car idle see how there burning going down the track, Sorry for the Book of the post just figured I would throw my 2 cents in, I'm not a expert by any means I just take junk and throw it together and maybe it will work LMFAO I wish you the best of luck alot of good guys on here that know there $**t has gave very good advice to ya so id say take it and learn from it GOOD LUCK AND KEEP US POSTED!!

[BruceWilkie]

Best way to tell if a fuel supply problem is to add more jet. If performance doesnt change add more jet and if little to no performance change or color of plugs doesnt get darker at end of pass your not getting enough fuel, regardless if psi is good or big pump etc.. Find why its not responding to more fuel.

[grandville455]

Did u say what was in carb for jetting, power valves? air bleeds etc? this a new off the shelf carb or no? give us some info on carb, and its internals that will tell us alot

[stroker461]

Originally Posted by grandville455

Did u say what was in carb for jetting, power valves? air bleeds etc? this a new off the shelf carb or no? give us some info on carb, and its internals that will tell us alot

X2 - Agree!!!!

[ta man]

My 950 hp does well on mine,I usually jet around a 78/86 to a 80/88,just has a 50 cc pump on front and 37/37 squirters and stock metering blocks.I've ran almost 124mph with close to the same engine combo.

[scott70]

I wouldnt waste your money on changing out the tail pipes to 3" right now. My 4000 lb race weight GTO would go mid 11's with the 3" x pipe,,reduced down to 2.5 " mufflers and tailpipes. And your combo is way more than I had,,455,,JBP ported #62,,T2 intake ,800 DP and ultradyne cam similar to RA4 cam. Work with what youve got .

[Mike S]

Just wondering, is your converter custom for the new setup or an off the shelf converter? Years ago when I was racing my 4000lb 72 lemans street car I had an off the shelf 10 bm converter. Ran 12.20's at 107. Went to a custom 10 ati tree master (stalls 3400) and no other changes gained 5mph and lost .3 (11.9's at 112 with 60's of 1.61).

The engine is nothing great 455 stock rods, home ported 6x heads, rpm intake with 750 holley, flat tappet hyd cam. I also am running 3" x pipe to mufflers with 2.5 tailpipes. I shift it at 5400.

Had it out to the track last year. First time in 5 years and still turned 11.91/111.9. Not bad for a 18 year old engine.

[gke60]

Originally Posted by Mike S

Just wondering, is your converter custom for the new setup or an off the shelf converter? Years ago when I was racing my 4000lb 72 lemans street car I had an off the shelf 10 bm converter. Ran 12.20's at 107. Went to a custom 10 ati tree master (stalls 3400) and no other changes gained 5mph and lost .3 (11.9's at 112 with 60's of 1.61).

The engine is nothing great 455 stock rods, home ported 6x heads, rpm intake with 750 holley, flat tappet hyd cam. I also am running 3" x pipe to mufflers with 2.5 tailpipes. I shift it at 5400.

Had it out to the track last year. First time in 5 years and still turned 11.91/111.9. Not bad for a 18 year old engine.

I think he said it was a 3200, 10 inch continental, smaller rear tire might help a little.

[leeklm]

Originally Posted by Old Goat Racer

It never hurts to ask but, did you double check the WOT ?

X2, never overlook the obvious!

Sent from my XT1585 using Tapatalk

[BruceWilkie]

Originally Posted by Old Goat Racer

It never hurts to ask but, did you double check the WOT ?

For sure... my 68 firebird pedal arm needed reinforcement... it bent a little bit 1st time I raced it. There was little difference just looking at it relative to the floor.

[Michael G]

As I mentioned in the street section and what a lot of others are saying, you need to work out the 60' issues first.
Correct timing and proper air fuel mixture are crucial firsts. Initial timing will just mess you up if you don't know your total timing. Unplug that vacuum hose and start with 32deg. total. Low vacuum readings are also a great indicator of something going on with the above or maybe even improper cam timing. You should be seeing around 11-12" with that cam.

[Jim Robertson]

Have not seen this mentioned but you might want to ensure you engine is sealed up. Run a leak down and a compression check. All the external tuning in the world will not fix an internal issue. Just seems like you are way down on power. Carb and fuel seem highly suspect to me also. Good luck.

[71 T/A]

Originally Posted by Jim Robertson

Have not seen this mentioned but you might want to ensure you engine is sealed up. Run a leak down and a compression check. All the external tuning in the world will not fix an internal issue. Just seems like you are way down on power. Carb and fuel seem highly suspect to me also. Good luck.

Ran a compression check and 5 cylinders were at 145 and 3 were at 150.
This is on a motor that has less than 1,000 miles.
Oil consumption is very minimal even after 9 passes at the track that day.
Oil pressure is solid 60 at cruise. 20-30 at idle.

[ta man]

Compression seems low I'm at 175/180 with the same cam,85 cc SD 290cfm KRE heads on a 462.