How did this cam change do this much ?

Everett Vassar · 02-10-2010, 04:03 PM

Car did come from Ala to Tx--But first car that made that move ran the same in Tx as Ala
Everything else the same SBC 383, stock 400 heads, glide, 8" PTC conv, 4:30 gears Weight 3550lbs with driver ----original cam
Comp .501/.501 292 RPM range 2500-6500 60ft 1:70,s 1/8mi E.T 7:70,s MPH 85
New cam--Jegs .488/.510 292/302 RPM range 3000--65000 60ft 1:78,s 1/8 mi 8:01 MPH 85

Best time to date with new cam 7:91 in cool weather Jacking up at starting line to 3K needed extra foot on brake pedal. Obviously I guess I need to go back to the Comp and see if I get my .3 back--But what happened Lower cyl pressure? Need more converter? Better heads?--are Jegs cams junk?

Mike Taylor 3601 · 02-10-2010, 05:28 PM

Send me duration@.050, Advertised durations and @ what lift its rated, lobe seperations
and what you degreed them at? or call me with cam cards in hand.606 678 3039 9-5est.
or cell 606 278 0601.
Mike Taylor 3601

danny waters sr · 02-10-2010, 08:38 PM

Been there -done that.. Needs more converter.

TOSTO RACING · 02-10-2010, 09:09 PM

Looks like both cams had the same mph which is what I look at for horespower diff. I'd say they are pretty close in horsepower.

Everett Vassar · 02-11-2010, 01:00 PM

Mike, you have P.M.---Thanks
So Danny your saying go back to the Comp cam or keep the Jegs cam and loosen up the converter? Will they both produce the same results? Cheaper to change cams.
so this car is so heavy and underpowered Just that change killed my 60ft and E.T.?
Maybe I should go with a .480/.480 280/280 or a .490/.490 286/286 To get this thing a little harder out first 60--100ft.

danny waters sr · 02-11-2010, 04:51 PM

If you want to go faster then the cam you have got now seems to me needs more converter to put you in the power range. You lost 60 ft ,but your cam range is higher on bottom end (2500 compared to3500) .If you put a looser converter in, it should pick your 60 ft up in turn you should have more et. Cam must be good to run same mph and worst 60ft. Just my opinion. I have gained a lot of et in just converter testing and still testing. A 283 may be more sensitive to converter playing than a larger cubic inch motor is. I had 3 tenths change in just converter swapping so far.

02-10-2010, 04:03 PM	#1
Everett Vassar Member Join Date: Jun 2004 Location: Kennedale,Tx Posts: 227 Likes: 0 Liked 2 Times in 2 Posts	How did this cam change do this much ? Car did come from Ala to Tx--But first car that made that move ran the same in Tx as Ala Everything else the same SBC 383, stock 400 heads, glide, 8" PTC conv, 4:30 gears Weight 3550lbs with driver ----original cam Comp .501/.501 292 RPM range 2500-6500 60ft 1:70,s 1/8mi E.T 7:70,s MPH 85 New cam--Jegs .488/.510 292/302 RPM range 3000--65000 60ft 1:78,s 1/8 mi 8:01 MPH 85 Best time to date with new cam 7:91 in cool weather Jacking up at starting line to 3K needed extra foot on brake pedal. Obviously I guess I need to go back to the Comp and see if I get my .3 back--But what happened Lower cyl pressure? Need more converter? Better heads?--are Jegs cams junk?

02-10-2010, 05:28 PM	#2
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,372 Likes: 354 Liked 307 Times in 103 Posts	Re: How did this cam change do this much ? Send me duration@.050, Advertised durations and @ what lift its rated, lobe seperations and what you degreed them at? or call me with cam cards in hand.606 678 3039 9-5est. or cell 606 278 0601. Mike Taylor 3601

02-10-2010, 08:38 PM	#3
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 1 Liked 0 Times in 0 Posts	Re: How did this cam change do this much ? Been there -done that.. Needs more converter. __________________ Danny Waters, Sr / 73 Duster "340"

02-10-2010, 09:09 PM	#4
TOSTO RACING Senior Member Join Date: May 2007 Location: DRAGSTRIP Posts: 886 Likes: 883 Liked 652 Times in 184 Posts	Re: How did this cam change do this much ? Looks like both cams had the same mph which is what I look at for horespower diff. I'd say they are pretty close in horsepower. __________________ 5664 GHI/SA 1985 CAMARO RED H/SA 1985 CAMARO BLUE I/SA

02-11-2010, 01:00 PM	#5
Everett Vassar Member Join Date: Jun 2004 Location: Kennedale,Tx Posts: 227 Likes: 0 Liked 2 Times in 2 Posts	Re: How did this cam change do this much ? Mike, you have P.M.---Thanks So Danny your saying go back to the Comp cam or keep the Jegs cam and loosen up the converter? Will they both produce the same results? Cheaper to change cams. so this car is so heavy and underpowered Just that change killed my 60ft and E.T.? Maybe I should go with a .480/.480 280/280 or a .490/.490 286/286 To get this thing a little harder out first 60--100ft.

02-11-2010, 04:51 PM	#6
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 1 Liked 0 Times in 0 Posts	Re: How did this cam change do this much ? If you want to go faster then the cam you have got now seems to me needs more converter to put you in the power range. You lost 60 ft ,but your cam range is higher on bottom end (2500 compared to3500) .If you put a looser converter in, it should pick your 60 ft up in turn you should have more et. Cam must be good to run same mph and worst 60ft. Just my opinion. I have gained a lot of et in just converter testing and still testing. A 283 may be more sensitive to converter playing than a larger cubic inch motor is. I had 3 tenths change in just converter swapping so far. __________________ Danny Waters, Sr / 73 Duster "340" Last edited by danny waters sr; 02-11-2010 at 04:53 PM.