Laying over...Please help????

SUPER STREET ROB · 09-30-2012, 08:56 PM

went to the track today. Car has a 434 small block with 18 DEGREE heads. t-350 trans with 430 gear. Its a 1980 grand prix. Motor has 35 runs on it and has ran perfect till today. First time run went 9.19 @ 146 mph. then after that it went 9.29. It falls over real hard at the top end of 1st gear. I shift at 7000rpm 1st and 2nd gear and goes threw at 7000. Today the last 3 runs it would get to 6700rpm in 1st gear and lay over hard then after i shifted 2nd to 3rd it pulled hard as it ever did. So what would cause this to happen only at the top end of 1st gear and not the rest of the run???? Like I said it ran great up untill after my first time run today. Thanks for all your input on this...........Rob

FED 387 · 09-30-2012, 10:15 PM

Valve springs ????

Mike Pearson · 10-01-2012, 11:00 AM

I would guess fuel pump or too low float setting.

FED 387 · 10-01-2012, 12:48 PM

yep could be a fuel problem too but if it never has happened before I'm sticking with valve springs!!!

SUPER STREET ROB · 10-01-2012, 02:53 PM

It has a Rons terminator injection on it. And the springs have 30 runs on them

FED 387 · 10-01-2012, 02:58 PM

I'd still check the springs/pressure could be worn out

09-30-2012, 08:56 PM	#1
SUPER STREET ROB Member Join Date: May 2008 Location: CONOWINGO MD. Posts: 119 Likes: 0 Liked 0 Times in 0 Posts	Laying over...Please help???? went to the track today. Car has a 434 small block with 18 DEGREE heads. t-350 trans with 430 gear. Its a 1980 grand prix. Motor has 35 runs on it and has ran perfect till today. First time run went 9.19 @ 146 mph. then after that it went 9.29. It falls over real hard at the top end of 1st gear. I shift at 7000rpm 1st and 2nd gear and goes threw at 7000. Today the last 3 runs it would get to 6700rpm in 1st gear and lay over hard then after i shifted 2nd to 3rd it pulled hard as it ever did. So what would cause this to happen only at the top end of 1st gear and not the rest of the run???? Like I said it ran great up untill after my first time run today. Thanks for all your input on this...........Rob

09-30-2012, 10:15 PM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 522 Liked 330 Times in 178 Posts	Re: Laying over...Please help???? Valve springs ????

10-01-2012, 11:00 AM	#3
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,444 Likes: 613 Liked 1,916 Times in 574 Posts	Re: Laying over...Please help???? I would guess fuel pump or too low float setting. __________________ Mike Pearson 2485 SS

10-01-2012, 12:48 PM	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 522 Liked 330 Times in 178 Posts	Re: Laying over...Please help???? yep could be a fuel problem too but if it never has happened before I'm sticking with valve springs!!!

10-01-2012, 02:53 PM	#5
SUPER STREET ROB Member Join Date: May 2008 Location: CONOWINGO MD. Posts: 119 Likes: 0 Liked 0 Times in 0 Posts	Re: Laying over...Please help???? It has a Rons terminator injection on it. And the springs have 30 runs on them

10-01-2012, 02:58 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 522 Liked 330 Times in 178 Posts	Re: Laying over...Please help???? I'd still check the springs/pressure could be worn out

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