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Help build a 302 for 350hp!?

 
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volvo240400
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Joined: 25 Nov 2007
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146.02 points



PostPosted: Sun Nov 25, 2007 6:25 pm    Post subject: Help build a 302 for 350hp!? Reply with quote

Can anyone give me some suggestions on how to get 350hp from a 87 E7TE-CA non roller block? I would like to use 351w heads.
Cannot afford NEW heads.
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Mon Nov 26, 2007 5:46 am    Post subject: Reply with quote

Heads are everything to achieve your goal (they pretty much always are). The earlier model 351 heads should be able to do it, but not without some port work. Later model 351 heads (can't remember the year break, seems like it was mid to late 70's) are basically the same as 302 heads and offer no advantage. I have seen a magazine test with AFR heads that just made 400h.p. with their heads and a stock hydraulic roller camshaft. Another good magazine test was on a fuel injected setup. They changed the normal bolt on stuff on a 5.0 like throttle body, mass air, headers, underdrive pulleys, and even another intake. Total gains were something like 20 - 30 h.p. Then Edelbrock Performer RPM heads were installed - 79 h.p. gain just from the heads. Now the heads were working well with everything that had been previously installed, so the heads wouldn't have been worth that much without the supporting components, but you get the picture. I would invest everything I had in my budget to bowl work alone since this area offers the biggest potential for gains. Rest of build would be pretty basic, RPM air gap intake, 650 carb, good ignition (factory Duraspark is pretty good at this level), headers, etc. If this is a street build, I would at least try to switch to a flat top piston to get a little more compression. You could run a fairly small camshaft and that should be it. Clay
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wagon train
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Joined: 07 Jun 2007
Posts: 258
Location: Orange City, FL
7307.16 points


1983 Mercury Capri

PostPosted: Mon Nov 26, 2007 8:52 pm    Post subject: Reply with quote

Use C9OE or DOOE castings.Just make the ports larger. Fel-pro 1262 intake gasket is the size you want to make them.I ran those in the early nineties and had good success.306,dooe heads 238-242 @ .050 .478 .488 lift 110 LS,9.0-1 Offenhauser Port-o-sonic 700cfm 1 5/8 headers ran 12.80 at 112 mph in a 3000lbs capri with a manual trans.Unless you do all the work yourself on the heads sometimes it is cheaper to buy a new set.
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87turbofoxbody
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Location: Virginia
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1987 Ford Mustang

PostPosted: Sat Feb 13, 2010 2:24 pm    Post subject: Reply with quote

i have a set of ported D00E heads 1970 351W truck heads, 60.4cc chambers for sale if your interested
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1987 Mustang GT 5.0L 5speed
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kandpsdad
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Joined: 19 Oct 2010
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PostPosted: Tue Oct 19, 2010 3:08 pm    Post subject: Reply with quote

I wouldnt use the 351 heads if your wanting to make 400 horse. Me personally would use the 289 hipo heads. Get them shaved to about 64cc and have them ported. Dont get me wrong the 351 head is a great head but the 351 head has a bigger head bolts(7/16 i think) and the 289-302 has the same bolt size( 3/16 i think). Also the 289 hipo head has a smaller combustion chamber so more compression= more horsepower. I have a set on my 302 and i am making 456 horse. thats just my opinon
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Tue Oct 19, 2010 7:37 pm    Post subject: Reply with quote

kandpsdad wrote:
I wouldnt use the 351 heads if your wanting to make 400 horse. Me personally would use the 289 hipo heads. Get them shaved to about 64cc and have them ported. Dont get me wrong the 351 head is a great head but the 351 head has a bigger head bolts(7/16 i think) and the 289-302 has the same bolt size( 3/16 i think). Also the 289 hipo head has a smaller combustion chamber so more compression= more horsepower. I have a set on my 302 and i am making 456 horse. thats just my opinon


289 heads are tiny ports.
Built a 289 with C heads and had head gasket issues. Went to a 1/2" bolt and has run over 50,000 so far with no issues!
Yes the chamber is small on the 289 head but without some good porting will not make the 450 HP. Sorry can't go there.
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Thu Oct 21, 2010 7:46 pm    Post subject: Reply with quote

put in chevy 302=done
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91GT347
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Joined: 07 Dec 2010
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PostPosted: Tue Dec 07, 2010 5:08 pm    Post subject: Reply with quote

The problem is the port work would cost as much as a set of heads. especially after you have to buy new springs and all to rebuild the stockers. Good used heads are everywhere, cheap for a 302. I got TFS heads, cam, rockers, pushrods, and valve covers for 1000 bucks on Ebay.
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