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Author
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Topic: 351W limitations?
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-01-2001 07:24 AM
   
My '70 ragtop needs to 'appear' stock in order to qualify for 'Collector' plates and thus will retain the stock cast exhaust manifolds, stock (69) 4V intake, and stock airfilter housing and valvecovers. My goal is to get the car into the high 13 second range which pose a few questions that experienced 351 W engine builders will have experienced. I am grateful for any opinions.
1) I am using World Products Windsor Sr. heads. Does the stock intake and exhausts limit the airflow to the point where the rpm will be maxed and so do I need a careful Cam consideration? I have had good luck with solids in the past and would prefer to use one now so I can run a bit higher cam and tighten the lash for the strip. I am totally lacking the knowledge to know what cam profile to use.
2) The shop I am getting the heads from is trying to sell me a proven stroker combination that they dynoed at 500 hp/500 ftlbs torque. I realize I couldn't see these numbers with stock manifolds but would these stock manifolds flow well enough to see a worthwhile improvement to justify their cost? I'll have a 2/12 inch exhaust with an 'X' join to help keep the flow velocity up.
Thanks in advance.
Dave------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"
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chips67
Gearhead Posts: 651
From: louisville, ky, usa
Registered: Jul 2001
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posted 09-01-2001 10:48 AM
piston speed limits rpm. a 351w will not rev as high as a 302 because the stroke is longer and the piston speed at 5000rpms will be higher than a 302 at 5000rpms. high 13's should be easy without the need for a stroker kit and the stock exaust manifold will already be killing your hp with just the heads you have. wonder if you could get away with an aftermarket intake manifold shaved in the right places and painted ford blue to match the factory intake? the exaust manifold on fords SUCK so bad, they are restrictive even with stock heads. maybe you could have them extrude honed or ported in some way if they are absolutely neccessary. that will be the biggest cork in you combo. if you can overcome it you will have a killer sleeper motor and 13's will be so easy.------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.78 60ft. time.
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jkilroy
Gearhead Posts: 1703
From: Vicksburg, MS
Registered: Dec 99
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posted 09-01-2001 02:31 PM
I bet if you could get a pair of factory style shortys for a truck to fit, paint them black, and nobody will be the wiser.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-01-2001 11:25 PM
Yes, I think that I may be able to use a painted aftermarket intake, any ideas on what looks stock? I can also use dealer-istalled items so did dealers in 1970 install try-ys ( I'm not quite that old!) What years truck ahd shortys and whould they look stock for 1970?How about a cam for a restricted motor? Dave ------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 09-02-2001 02:59 PM
I would say look for a cam on the mild side that is split profile. The extra duration on the exhaust side will help with your restriction. I can't give specific reccomendations since I have not used one myself. quote:
Originally posted by stang106:
Yes, I think that I may be able to use a painted aftermarket intake, any ideas on what looks stock? I can also use dealer-istalled items so did dealers in 1970 install try-ys ( I'm not quite that old!) What years truck ahd shortys and whould they look stock for 1970?How about a cam for a restricted motor? Dave
IP: Logged |
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