XD408

hey guys

A friend of mine is about to pull his 351 clevo out as theres a botom end knock, basically to sort out the problem and give it some more HP its pumped out 296 RWHP thru a toploader 9" 3.55 setup,the motor is standard stroke 351 i believe is a set of 2v heads well atleast it looks like they are but he reckons that he was told they were 4vs (has the little 4 in the inner corners of the heads??) a big Hydraulic cam, xcellerator manifold and a 750 holley. He wants to go solid and get somewhere near 330-350 rwhp what cam etc.. should he use???

4Vman

Id go the trusty Crane F246 solid cam, its a very tried and trusted combo and will make 450 FWHP with 4V heads, accelerator manifold and 750DP without any issues.
I use this combo and it made 340 RWHP.

brenx

An F238 would be better suited with 2V heads. A mate of mine owns a 355rwhp 2V 351.

Brenden

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XB Fairmont (street car) 11.07@123.02mph.

XD408

Cheers for the suggestions, what were the duration and lift specs for those cams F238 and the F246???

brenx

F238:

238 @ 50 554thou lift (in)
248 @ 50 577thou lift (ex)

FAIR IDLE, MODERATE PERFORMANCE USAGE, GOOD LOW AND MID-RANGE TORQUE AND HP, LIMITED OVAL TRACK, MILD BRACKET RACING, AUTO TRANS W/2500+ CONVERTER, 3400-3800 CRUISE RPM, 10.5 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 3000-6500

Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6500
Valve Float 6800

F246:

246 @ 50 570thou lift (in)
256 @ 50 590thou lift (ex)

ROUGH IDLE, PERFORMANCE USAGE, GOOD MID TO UPPER RPM TORQUE AND HP, SHORT OVAL TRACK, BRACKET RACING, AUTO TRANS W/3500+ CONVERTER, 11.0 TO 12.5 COMPRESSION RATIO ADVISED. BASIC RPM 3800-7000

Recommended RPM range with matching components
Minimum RPM 3800
Maximum RPM 7000
Valve Float 7400

Both are solid cams

__________________
XB Fairmont (street car) 11.07@123.02mph.

XD408

Thanks for that not sure what cam hes gonna want to go with he really wants to get as much HP out of it as possible and only really drives this thing on weekends i guess with the F246 cam hes gonna need to have 3.9s or 4.11s with the manual, and possibly change his interference extractors to tuned length, hes running 10.1 comp at the moment and didnt really want to go any higher still wanted to be able to use pump fuel ie...U98. it should be all together by the end of this month ill keep you posted on specs, HP and torque figures when it hits the dyno.

brenx

Both of those will run with 10:1 just won't be at their optimum. 10:1->10.5:1 and still use U98 fuel. I used to run 10.5:1 with U98 with no issues and my mates car with the F238 runs 10.5:1 with U98 fuel.

Brenden

__________________
XB Fairmont (street car) 11.07@123.02mph.

russxr67

i,d go with something even bigger like the f256 if he has the 4v,s and only going to use it on weekends.I,ve used solids with 260 + on the street and with the right gears they are fine for a weekend warrior.I don,t think much of the 4v weiand intake and i would be looking at using port plates on the intakes.