65f1005.0

i have a stock 91 5.0 HO short block and i have 210cc heads and 2.02 valves and i need a cam with a 3,000-6,250 power band. The cams that i want to run will not clear the pistons. as of, i am settling upon the XE274HR that has a 2200-6200 rpm range and .513/.513 lift with a 1.6 ratio rockers. The duration is 276/282 with 1.7 ratio and i awsume is the same with 1.6 ratio? any suggestions? or, experience? c'mon guys somebody has to have factory unnotched pistons with these valves.

mjr46

bet ya that thing is gonna be a slug!!! head choice is all wrong = to much head and I had a friend with canfield 195 heads on a 302 with 2.02 valves on factory unnotched pistons and a custom designed cam from Jay Allen to work, a custom cam will be your best bet and a 170-185 head max would be your most optimal choice, I have 185 heads on my 347 that just make it scream...bigger isn't always faster

65f1005.0

well i do pretty good for myself i ran a 12.9 @ 101 last weekend. Remember it is in a 65 F-100 also. i know that bigger isn't always better, but my wallet isn't exactly big either and i plan on building a 408 eventually and i cannot afford to buy heads again and it sure is a whole hell of a lot faster then the 16.2 @ 85 it ran with the stock 5.0 HO.

89Ford

thats a problem

if you are planning a 408 then why can't you settle for a 12.9 and save for the engine build.

and your best bet is a custom cam by Jay Allen

65f1005.0

Well the 408 won't be for awhile. i am a freshman at osu and won't be making any significant cash for a long time. i also got 2nd in the state for automotive students and i have a full-ride to Wyotech so we are lookin at 5 years before any significant cash flow is happening. i plan on running my 302 hard until a new short block is a must. I am sure i will have the truck till then becuase my dad, brother, and I fully restored it and it won't ever be worth selling it. how much do the custom cams cost? and, does Jay Allen help you design one for you particular powerband and flow potentiol?

F150 StrokerCobra

im getting the E303CAM with my 5.0HO my 1989 F150 that im building..

stock GT40 heads and later on i will install 1.7Rockers to get more lift 0.535 to be axactly

Joel5.0

210cc heads....... which ones are those?..... Victor Jr.'s? .....anyway, they are not "too big of a head" when combined with the correct camshaft and valve train on a 302 block. A custom cam will indeed be required though...... there are a few real case examples but the one I use most is the following:

A 306 (stock 302 block overbored .030")
Victor Jr heads (210cc intake ports)
Weiand Accelerator single plane intake OOTB
1 5/8" primaries L/T headers
2.5" exhaust
650 Carb with a 1" open spacer
9.75:1 compression
Idling at 14.7" of vacuum
VERY driveable
20+ mpg
14.7" of vacuum
Yet it made 11.31 @118.77 MPH in the 1/4 mile short-shifting @6500 rpms
How "big" was that cam?
210'ish/220'ish at .050" .576"/.560" lift w/1.6 RR with the correct LSA and valve timing events. Almost a stock "sounding" cam that combined all the components to provide driveability, MPG's and performance.

Intake port volume is not the important item to ID a head as too big or small. Did you know that the Canfield 195's, the TFS TW 170's and the AFR 185's are very similar in "size" when you use the average cross section area (one of the important characteristics) of the port to compare them?

You could use those 210cc heads effectively and with great results in your 302, but you need to match them with the correct cam and valve train. They will not be the best alternative for your 408 stroker plans though.

F150 StrokerCobra

this cam will work gr8 with DART iron heads
http://store.summitracing.com/partde...8&autoview=sku

dunno if it can help you?

you can use it with 1.6 rockers to get 0.512 lift and r and 1.7 rockers to get 0.544 of lift

65f1005.0

Thanks guys, keep it coming. my heads are Pro-Comps. they are the later design and are excelent heads. I compared them to Edelbrocks which they are identicle to and the machine work was better on the Pro-Comps, springs were better, valves were the same, and as for price $748 shipped to my door is pretty good. anybody who bashes the new design doesn't have a set. I agree the first gen heads are the biggest peices of crap around. If it has freeze plugs in between the springs then it is a great head. I would suggest them to anybody on a budget. the cam that is on the canfeilds is a little to low of an rpm range, but thanks anyway. I'm looking for 2500-6200 roughly. Thanks agian guys keep it comin.

F150 StrokerCobra

here you go just what you where looking for

http://store.summitracing.com/partde...N&autoview=sku

Basic Operating RPM Range: 2,500-6,500
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 232
Duration at 050 inch Lift: 224 int./232 exh.
Advertised Intake Duration: 284
Advertised Exhaust Duration: 290
Advertised Duration: 284 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.535 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.544 in.
Valve Lift with Factory Rocker Arm Ratio: 0.535 int./0.544 exh. lift
Lobe Separation (degrees): 112