LittleBoyBlu99

I am on a quest to run 10.90's this winter and I am looking at these cams to help me reach this goal.The G1's spec is= 228/232-.588/.575:114 and the R1 is= 232/236-.575/.578:113 which one to choose?

I swapped rear end's from 3.42's to 3.90's and my B1 cam seem to fall flat now above 6400 rpm. Thanks for any help you can give.

Jimmy98Z

I would go with the R1 it's a bad *** cam and it's even better with nitrous.
Jimmy

offaxis

iTrader: (19)

Go R1

I have it and it makes great power

LittleBoyBlu99

Thanks guy's " the R1 is my choice also unless someone change's my mind.

00T\A

I would say R-1 For N\A applications.
The G-1 sounds like a sweet blower grind.

Colonel

This is for a 346ci NA engine? I don't think I'd go with so much exhaust duration.

Why not the X1? I think it would make pretty much the same HP as the R1 with better drivability.

(The LSA is 113 on the G1 and 114 on the S1, fwiw.)

LittleBoyBlu99

MTI was not wanting to fly cut my pistons and they felt one of these cams would give me the power and torque I need to run 10's. I have MTI's old Stage II R heads w/2.055 valves. What is the down side to running with exhaust duration this high?

Colonel

The only downside to the extra exhaust duration is increased overlap which effects your idle and drivability somewhat. It'll still make just as much power as if it were a single pattern or reverse split cam, all else being equal (it might even make a little more power up top due to the increased scavenging effect of the extra overlap.)

LittleBoyBlu99

Thanks (Colonel) for the help and I will talk this over withthe guy's at MTI and then decide!

LittleBoyBlu99

Guys" what kind of hp gain did you get with the R1".

Colonel

BTW, the R1 is an ancient design that was originally intended for 422ci engines. I used to run it in my 422. I later upgraded to the first S1 cam ever ground. That cam went 9s on motor.

offaxis

iTrader: (19)

I really like the r1 . It might be an old design but it works great. I gained a good amount of hp over my tr230 cam. At some points as much as 26 hp and averaged about 15hp gain from 4500 - 6500. Plus I have mine on a 112+4 and I make peak power at 6100 rpms and it pulls through 6800. I also like the fact that its not as hard on the valve springs as some of these larger lift cams and cams with more agressive ramps.

WILWAXU

iTrader: (6)

X1 got me into the 10's. Hoping for some low 10.8's this fall.

Talk with the gang at MTI, they'll do you right.

LittleBoyBlu99

Nice times" MTI talked to me about these two cams" G1 & R1 . The G1 is a new grind that they said makes good power over my B1 and they said the R1 would give me the power I was needing for 10's also. The X1 would require fly cutting because I have the stageII R heads with the larger valves.

LittleBoyBlu99

What gear & converter size do you guys use"? I have the Yank SY4000 & 3.90 gears. I may upgrade to the harder hitting ST4000 .

scalemaster

iTrader: (3)

Are ur head's mill

LittleBoyBlu99

They are MTI's older stageII R heads w/2.055 valves

scalemaster

iTrader: (3)

well I got the same heads and was looking in to get a cam for the heads

WILWAXU

iTrader: (6)

I run a Yank TP-4200 w/3.73's. I'd recommended a SS-4200. It will feel tigher than your SY do to the difference in STR.

LittleBoyBlu99

That could be a later mod for Blu"