montyv8

hey guys, got a few questions. in my shed i have:
2 complete 302's, both out of XD/E's. (electronic dizzy etc)
1 complete 351, not sure what it was in, but its pre-XC.

i want to build a reasonable 351 for the xb coupe i pick up in three weeks.
heres the basic package:
late block
351 crank and rods
standard size 351 pistons, maybe 30 thou o/size
closed chamber 2v heads with standard size valves
standard electronic distributor
edelbrock perfomer or similar manifold
pacemaker tri-y extractors
650dp holley
not sure on cam yet

fairly basic huh? can i drop the closed chamber heads straight onto the 351 without any probs?
i'll be running a c4 and 3.5:1 9inch. the car will be used mainly for weekend cruising, and the odd run down the track for a laugh. will not be used for daily driving at all. what size stall converter should i use?
i've probably missed out heaps. if anyone has any suggestions, they're more than welcome. sorry about the long post guys.
cheers, Phil

 

russxr67

the closed chamber heads will yield way too much comp with pump gas unless you are prepared too either hog the chambers out or use a dish type piston.can you be a little more specific on cam? solid ,hydraulic, rpm range etc ,then we can give more specific details.

falcon coupe

Use tri-y for bottom end, use 4 into 1 if you want it to rev hard, stall convertor should be matched to your cam profile, so it comes in just as the cam is starting to work in it`s intended rev range.
Is the bottom end going to be standard or balanced ? no point going to mad up top if the bottom wont handle it.

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xr8_sprint

very similar specs to my old motor...

in a XB with things done right you can expect to be in the 13's for sure.

enough to keep alot of v8s out there honest... Alot of room for improvement with that motor (ACL Race series pistons, 6" 302 Rod with ARP bolts, work the 2V heads, weiand manifold, DP carb.. the block/crank/heads are capable of 450+HP).

shane

shane

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1981 XD Ex-Interceptor - 393C, AFD 4Vs, Methanol Injection, Powerglide

1994 ED XR8 Sprint - 347W, 5-speed, 3.9s


http://hi-performance.net

montyv8

i've never had a car with a hi-stall before, so wasn't sure what stall to fit, and the cam profile i'd need for it. rev range would probably be 2000-5000 i guess. i usually play around with manuals so not sure on the whole auto scene. but, like i said, it'll mainly be for cruising, with a bit of an occasional thrash.
the crank etc will be balanced.
what are the pro's and con's of the two different types of cams?

STROKEXD

MontyV8 as you described it that would make a great sensible combination, with the right cam will be a good torque producer. Someone else said it would do 13's, doubt that very much with near standard heads and a street hydraulic cam.

Keep the cam reasonable, suggest a small hydraulic, the 302 heads work great - I've tried it that way. Get the heads releaved and use flat tops rather than dished pistons to get it down to 10:1 thereabouts.

That sort of combo will work well with standard gearing or only slightly higher than standard.

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STROKEXD

PS Keep the cam small enough so you don't need a high stall, waste of torque if you don't need it.

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montyv8

i was thinking about getting the heads ported and polished to, as i know somewhere i can get a good job done for a good price.
should i use 302 rods in the combo i suggested and acl or similar pistons to suit? i recall hearing somewhere something along those lines, 351 crank, 302 rods and "boss" pistons.

STROKEXD

In my view the 302 rod option will be an additional cost that won't make a scrap of difference in your situation.

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ford4v429

If youre replacing parts, I'd sure go with longest rods you can stuff in it...heres a link to some good info on effects of rod length/stroke ratios:

http://www.victorylibrary.com/mopar/rod-tech-c.htm

and another link that tells stroke/rodlength for just about every standard motor out there at a glance(note how high the ratio is on the ford429, and the 426 hemi chrysler- the highest ratios in anything over 400 cubes, and a couple of the best racing engines ever built for nascar):

http://users.erols.com/srweiss/tablersn.htm

do yourselves a favor, read thru that first site thoroughly- very interesting stuff, and a lot more than the simple sidethrust issue that always worried me on strokers...timing, detonation, lots more related than I ever thought about...

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