Greetins allI have a few Xflow questions if you dont mind

[Anlushac11]

8)

Some of you know about Jacks hybrid American 200 block with a crossflow head.

there has been some mention of a EFI cam being popular.

Does anyone have the specs of the EFI cam?

I am looking at about 10:1CR, dual outlet extractors and dual exhaust, a 4bbl intake with a 450cfm Holley 4bbl(possibly a 600cfm one later). I already know where i can get a set of 351C full roller rockers used.

The cam I was looking at is the Crow 14892 which is about 280deg dur amd .510" lift. I have a C4 automatic but plan to have a 3000rpm stall converter and a shift kit in it before it is reinstalled.

If I do not go with a high stall converter I was looking at the 14776 which is a 268/278dur and .470"/.480" lift.

What are the hot tricks for the xflow heads? From what i have read the head flows fantastic and is sized almost perfect out of box for a 200 but that the intakes are the main bottleneck. If I get a Redline 4bbl intake what next?

The car is a 1980 Fox body Mustang which will weigh about 2600lbs and 3.55:1 Traction Lock 8.8" rear.

Also does anyone have any flow numbers for a stock xflow head?

Thanks for any info.

 

[alloydave]

CAMSPECS FOR 250EFI CAM. FEDERAL MOGAL # CS6017

CAM LIFT INT 0.246
EXH 0.237

VALVE LIFT INT 0.426
EXH 0.410

DEG.DUR@.050 INT 201
EXH 193

LOBE SPREAD 109

CHEERS DAVE

 

[addo]

The 4-barrel is probably way overkill. The Sprint manifold is highly rated, and fairly high-priced, but is probably a better bet on a 200.

BTW, there may well be a spare 221 in San Jose in 4 weeks...

Adam.

 

[MustangSix]

According to the Factory manual, the XF EFI cam spec is:

Intake Open @ 24 BTDC at .06mm lift
Intake close @ 68 ABDC at .12mm lift
Exhaust open @ 62 BBDC at .06 mm lift
Exhaust close @ 30 ATDC at .12mm lift
Lobe lift .235"
Valve lift .407"

It's a 272 degree cam, basically.

The carbed cam is
22 BTDC
56 ABDC
58 BBDC
20 ATDC

Same lift, but is a 258 degree cam.