Decided Not To Use 205's On a 306
02-10-2008, 10:30 PM
#11
6th Gear Member
Join Date: Dec 2006
Location: Citrus County, FL
Posts: 8,007
RE: Decided Not To Use 205's On a 306
The pistons are old TRW L2249N
those pistons are HEAVY, and because of that your limited to your maximum RPM. if your using STRONG rods and the BEST 3/8 ARP bolts (not just the waveloc's, but the better wavelocs that cost 2x more) then you should be able to spin it up pretty high.
i used to spin mine with a stock crank, stock rods with 5/16 arp waveloc bolts to 7k redline (well, around 6800 shift points) but one day idling in park it just snapped the crank in 10 pieces, so............
btw, my cam (and mjr's, we have the same grind) was rated for 3200-5800 with float @ 6500 but with 120 lbs of seat pressure they never seemed like they were floating to me. car still had nut off the line, but it really started to come alive at about 2000-2500 so you cant always go by the numbers on the card
02-11-2008, 03:00 PM
#12
3rd Gear Member
Thread Starter
Join Date: Feb 2006
Location:
Posts: 604
RE: Decided Not To Use 205's On a 306
Those pistons are heavy but, Removing the stress risers off the rods, polishing the crank, using lightweight rist-pins and the chromemoly rods bolts canceled out the over weight. The total rotating assembly weight is accually 200 grams lighter than factory weight.
BTW: The rods bolts are the BEST rod bolts you can buy for the 289/302 rods.
ARP part #ARP 254-6402
The combo last season made 350rwhp and ran 11.50-11.65's @around 117mph (sometimes 118) That was with a full weight LX that weighed 3200lbs with me. It now has 374rwhp but I didn't get a chance to run it yet. It nows weighs 2800lbs dry, and I only weigh 130lbs. If I can make 400rwhp, which is very possible if I switch to this custom cam from Rick Anderson and spin it to 7800rpms I think it just might break the 10's on motor with proper driving, traction and cool air.
BTW: The rods bolts are the BEST rod bolts you can buy for the 289/302 rods.
ARP part #ARP 254-6402
The combo last season made 350rwhp and ran 11.50-11.65's @around 117mph (sometimes 118) That was with a full weight LX that weighed 3200lbs with me. It now has 374rwhp but I didn't get a chance to run it yet. It nows weighs 2800lbs dry, and I only weigh 130lbs. If I can make 400rwhp, which is very possible if I switch to this custom cam from Rick Anderson and spin it to 7800rpms I think it just might break the 10's on motor with proper driving, traction and cool air.
02-11-2008, 04:49 PM
#14
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
RE: Decided Not To Use 205's On a 306
ORIGINAL: WLingle92lx
He's grinding me a cam that has .510 lift on the intake & exhaust, 248/258 duration @0.050, and a 110/106 split lobe seperation. RPM range on this thing is 3600-7800rpm!!!! Hesaid that I should have no problem gaining 30rwhp switching to his cam even with 510 lift compared to my current 620 lift cam.
He's grinding me a cam that has .510 lift on the intake & exhaust, 248/258 duration @0.050, and a 110/106 split lobe seperation. RPM range on this thing is 3600-7800rpm!!!! Hesaid that I should have no problem gaining 30rwhp switching to his cam even with 510 lift compared to my current 620 lift cam.
02-11-2008, 06:51 PM
#16
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
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RE: Decided Not To Use 205's On a 306
ORIGINAL: WLingle92lx
No, The LSA is 110 int. / 106 exh.
Its a split lobe seperation cam like the Alphabet cams.
No, The LSA is 110 int. / 106 exh.
Its a split lobe seperation cam like the Alphabet cams.
Another way of describing it is.... a 108 LSA cam with a 2 degree retard. BTW.... the N-111 is also like that......106 int./114 exh. = (106+114)/2 = 220/2 = 110 LSA with a 4 degree advance....... you may want to check.
03-09-2008, 11:55 AM
#17
Join Date: Mar 2008
Posts: 13
RE: Decided Not To Use 205's On a 306
I twist stock block up to 8600 with same pistons and eagle sir rodsforged crank, rest of the combo is 205 afr milled 40, isky solid roller272 at .050 650 lift 108 lobe sep.retarded 3 Deg. ,super victor intake with 1050 dominator, bassini step long tubes 3 mac exhaust. I never broke it and ran pretty good. 306cid 420 rwhp in 1996 cobrawith g-force t-5
03-09-2008, 03:45 PM
#18
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Join Date: Nov 2006
Location: arlington,WA
Posts: 3,743
RE: Decided Not To Use 205's On a 306
ORIGINAL: bretdfords
I twist stock block up to 8600 with same pistons and eagle sir rodsforged crank, rest of the combo is 205 afr milled 40, isky solid roller272 at .050 650 lift 108 lobe sep.retarded 3 Deg. ,super victor intake with 1050 dominator, bassini step long tubes 3 mac exhaust. I never broke it and ran pretty good. 306cid 420 rwhp in 1996 cobrawith g-force t-5
I twist stock block up to 8600 with same pistons and eagle sir rodsforged crank, rest of the combo is 205 afr milled 40, isky solid roller272 at .050 650 lift 108 lobe sep.retarded 3 Deg. ,super victor intake with 1050 dominator, bassini step long tubes 3 mac exhaust. I never broke it and ran pretty good. 306cid 420 rwhp in 1996 cobrawith g-force t-5
03-09-2008, 05:29 PM
#19
3rd Gear Member
Join Date: Sep 2007
Location:
Posts: 798
RE: Decided Not To Use 205's On a 306
ORIGINAL: bretdfords
I twist stock block up to 8600 with same pistons and eagle sir rodsforged crank, rest of the combo is 205 afr milled 40, isky solid roller272 at .050 650 lift 108 lobe sep.retarded 3 Deg. ,super victor intake with 1050 dominator, bassini step long tubes 3 mac exhaust. I never broke it and ran pretty good. 306cid 420 rwhp in 1996 cobrawith g-force t-5
I twist stock block up to 8600 with same pistons and eagle sir rodsforged crank, rest of the combo is 205 afr milled 40, isky solid roller272 at .050 650 lift 108 lobe sep.retarded 3 Deg. ,super victor intake with 1050 dominator, bassini step long tubes 3 mac exhaust. I never broke it and ran pretty good. 306cid 420 rwhp in 1996 cobrawith g-force t-5