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Old 12-13-2012, 11:46 AM   #1
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HP help?

I have the ford racing gt40x crate engine rated at 340hp. I undersand that the number is rated at the crank and that i lose more because of the AOD but i still feels like its lacking. What can i do to push this 302 to its limits? any good top end combo recomendations?it has gt40 auminum heads, gt40 upper and lower intake and E303 cam. Any help is alway geatly apreciated. Thanks.
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Old 12-13-2012, 12:25 PM   #2
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What rear end gear do you have? If its stock, put in a 3.73 or 4.10 and it will feel like a whole new car.
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Old 12-13-2012, 12:56 PM   #3
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It has 3.73
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Old 12-13-2012, 01:00 PM   #4
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Bore it Throw a stroker kit in her and have a shop port and polish
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Old 12-13-2012, 01:43 PM   #5
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I've considered it more than once but I really want to see what I can get from leaving the bottom end stock
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Old 12-13-2012, 01:45 PM   #6
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You could always just port and polish the heads and get an aggressive shop tune
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Old 12-13-2012, 01:55 PM   #7
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Remember the stock bottom end can only handle around 500hp safely. Then the block tends to split.
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Old 12-13-2012, 02:05 PM   #8
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keep the top end and like stated get em ported and throw a stroker kit in it probably your best bet and itd be cheaper most likely than a top end kit depending on what you choose
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Old 12-13-2012, 02:30 PM   #9
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How much do I need to bore to get a 347 to fit?
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Old 12-13-2012, 04:23 PM   #10
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Quote:
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How much do I need to bore to get a 347 to fit?
It's already bored, might need to have it machined for the crank though. If it were me I would go FI.
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Old 12-13-2012, 08:28 PM   #11
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How much do I need to bore to get a 347 to fit?
You can get a decent stroker kit for $1,000 plus installation !
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Old 12-13-2012, 08:33 PM   #12
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As long as the pistons aren't any bigger and all I have to do is hone it then I can spend more than 1,000. Any specific company that you guys trust more than any other?
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Old 12-13-2012, 08:35 PM   #13
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Quote:
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As long as the pistons aren't any bigger and all I have to do is hone it then I can spend more than 1,000. Any specific company that you guys trust more than any other?
DSS Racing
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Old 12-13-2012, 09:10 PM   #14
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347 striker it is then. Thank you all very much for all the help

---------- Post added at 10:10 PM ---------- Previous post was at 10:09 PM ----------

Stroker
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Old 12-13-2012, 09:23 PM   #15
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Is it a track car or a daily driver? Most daily drivers prefer the 331 over the 347 because of the poor rod ratio of the 347 causing longevity issues.
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Old 12-13-2012, 09:25 PM   #16
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Thank you for bringing that up. It's not entirely a daily but it sees way more road time than track time
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Old 12-13-2012, 09:43 PM   #17
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Hopefully someone else can chime in here, i dont have any hands on experience with strokers but from the research iv done on the two for a future build the 331 has been the favorite.
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Old 12-13-2012, 09:55 PM   #18
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i would do a 331 also. if its just a weekend cruiser then a 347 will suit your needs though. i just wouldnt recommend it if its a dd.
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Old 12-13-2012, 10:12 PM   #19
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Once you go 347 you'll want to look into getting a stronger tranny

---------- Post added at 04:12 AM ---------- Previous post was at 04:11 AM ----------

331 you won't have to worry about your tranny
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Old 12-13-2012, 10:14 PM   #20
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I will also be doing an auto to manual trans swap during this whole process. Ill be dropping in a tremec tko 500
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Old 12-13-2012, 10:32 PM   #21
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Quote:
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Once you go 347 you'll want to look into getting a stronger tranny

---------- Post added at 04:12 AM ---------- Previous post was at 04:11 AM ----------

331 you won't have to worry about your tranny
Gotta know why on the 347 but not a 331. The hp difference between them isn't that much.
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Old 12-13-2012, 10:36 PM   #22
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I would say if you exceed the 400hp mark and are racing it, regardless of cubic inches, upgrade the transmission.
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Old 12-14-2012, 08:08 AM   #23
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Its torque that hurts a tranny. An a well built n/a 347 will definately have more torque than an n/a 331. But with a tko 500 u will be ok for either.

---------- Post added at 09:06 AM ---------- Previous post was at 09:03 AM ----------

But u always have the option to go forced induction with low boost on stock bottom in. Or even better if u do stroke it. As long as u dnt go crazy its reliable power

---------- Post added at 09:08 AM ---------- Previous post was at 09:06 AM ----------

I meant bottom "end" not "in".
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Old 12-14-2012, 08:37 AM   #24
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My brothers 91lx n/a 347 stroker motor dynoed at 445 rwhp on a stock block and he's at his limit now
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Old 12-14-2012, 09:04 AM   #25
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My cousin has a N/A 347 stroker with a balanced crank, and Trickflow Track Heat ported and polished heads and intake and he chewed his Tremec TKO up in three days with just a couple of hard launches on it
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Old 12-14-2012, 06:28 PM   #26
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My cousin has a N/A 347 stroker with a balanced crank, and Trickflow Track Heat ported and polished heads and intake and he chewed his Tremec TKO up in three days with just a couple of hard launches on it
That would suck beyond belief...
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Old 12-14-2012, 06:59 PM   #27
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As long as the pistons aren't any bigger and all I have to do is hone it then I can spend more than 1,000. Any specific company that you guys trust more than any other?
Scat is a good rotating assembly
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