ranedoss27

iTrader: (4)

Hey guys,

Building a 6.0 iron block with a bored and stroked forged rotating assembly and p&p 317 heads. Looking to make around 900-1000 whp and just looking for input on these two blowers. Most people seem to lean towards the F1-A but I might be able to get a deal on an F1-R. This will be mostly a street car, I do a lot of racing in "mexico" so its mostly freeway pulls. Any input is greatly appreciated.

Thanks guys!

speedracer5532

iTrader: (8)

I had a F1-A on a 402 and loved it and then switched to a F1-R and had alot of belt issues. The F1-R takes a lot more power to turn it than the F1-A.

ramairetransam

iTrader: (18)

the f1-r will need a cog belt setup where the f1-a will be able to get away with the aster or sdce tensioned setup .

ranedoss27

iTrader: (4)

Seems like belt slip and parasitic loss are the biggest problems.....looks like im going to have to find a f1-A lol

armyboyatc

iTrader: (29)

For 900-1000hp I think the F1a will be a better fit. If you were going for 1200+ I'd say go with the F1R

ShiznityZ28

iTrader: (11)

The r will make more power. You guys should look at the gear drive setups. higher cost initually but no slip or belts etc. works pretty awsome. and you can still turn accessoris with some work.

Bob@BruteSpeed

iTrader: (16)

I wouldn't run more than 16 psi on 317 heads to keep from lifting the heads, you could run 18 to 20 psi with a thicker aftermarket head. These four bolt heads just don't have a lot of clamping force. The F-1A would be a lot more efficient in this boost range. Bob

Detoxx03

iTrader: (14)

F1A makes sense for you.

I8UR4RD

iTrader: (16)

The R is also harder to fit. Creates more heat. The F1-A has better street manners. Bob ran a C on his car with the aster bracket at 20lbs roughly. any larger than that and you either go cog, gear drive, or call huron for a T6 kit.

allout06

iTrader: (11)

i see a ton of guys running ~20psi with 317's/LS9 gaskets and head studs on 4bolt heads with 0 issues

I8UR4RD

iTrader: (16)

true dat. thicker heads are insurance, but they come at a price, and based on a good many of the setups running that sort of boost with no issues I cannot say its an absolute necessity.

Tirefire

iTrader: (1)

I just got my car back with a 95% tune. The belt walked at 15 lbs of boost 5800 rpm and my tuner said it was really rich. This is with an F1a and alky dual nozzles and Aster bracket. It should spin up to 6500, so I still have maybe about 5 more pounds hopefully my TFS 220 heads dont blow off. Lol tuner said that the tires were coming loose at 80 mph.

Bob@BruteSpeed

iTrader: (16)

Andy, did you get in touch with Chris this afternoon? Bob

Tirefire

iTrader: (1)

Bob, I sent him an email but no response. Found out I put the shims on the wrong side of bracket.

Tirefire

iTrader: (1)

Im sure the bracket will hold now, Bob. Like my tuner said going fast isnt always easy. We will see...

Bob@BruteSpeed

iTrader: (16)

Good deal Andy, I'm glad you found the problem. Bob

I8UR4RD

iTrader: (16)

sorry to hijack, but tirefire, maybe you need to put a katech tensioner on. and recheck your allignment. swap to better belt or something. i am anxious for your tune to be 100% and see what she does.

Tirefire

iTrader: (1)

18ur4rd, let me pm you so I dont hijack this thread. To the OP this was done with an F1A with a 3.90 pulley (smallest pulley to max out f1A), 6.0 block (AES 390), Aster bracket and TFS 220 heads. I think the only thing that is restrictive is the truck hat on the F1a.

ranedoss27

iTrader: (4)

ok f1a it is then lol and my plan was ls9 head gaskets with some good arp studs.