kingsize513

ok guys i need some input this motor is ticking me off its a built 408 stroker with lq4 block 243 heads stage 2.5 port job done by bully performance 202 intake valve and 106 exhaust and lunati voodoo cam 600 lift intake and exhaust 287/293 duration and comp cam ultra gold roller rockers 1.8 96mm typhoon intake with ported and polished throttle body to match after market fuel rails stock injectors and obx shorty headers. now i know i screwed up by using typhoon intake they are junk and the obx shorty headers even worst. here the thing this damn motor only making 378 hp to the wheels and 400 fbt i mean this motor should be putting at least 500 to the wheels or in the upper 400s. any input on the build will much appreciated. may be can point me in the right direction like where did i go wrong beside what i had mentioned earlier.

Fry_

Get some real headers and your injectors are too small.

redtan

iTrader: (5)

Try typing with some punctuation and paragraphs, that **** made my head hurt.

1) get some bigger injectors
2) get some long tubes
3) find out what the real duration at 0.050 on that cam is
4) get it tuned by a reputable person

But even with all that, I wouldn't really *expect* 500rwhp with that setup. Depending on who did the heads and what the actual size of the cam is I would expect somewhere in the mid-high 400s.

500+ usually takes a pretty decent cam and very very good OEM ported heads or aftermarket ones with a FAST intake.

427zm

iTrader: (9)

Agreed with all the above, but if you're going to switch the intake and you need better heads, I REALLY consider making the top end LS3 headed and let it breathe. You'll flow a ton more air and it'll get you 500 wheel.

kingsize513

the cam at .050 duration is 237 intake and 243 exhaust. i already ordered my long tubes i went with american racing 1 and 7/8 they are little bit pricey but they are worth the money. the top end i'm going with AFRs or ls3 top end. intake i will get the fast 102 and tb 102 to match. but i really need help with what size cam should i get and what size injectors you guys recommend?.

kingsize513

damn the ls3 is that much more better top end than the ls2?

redtan

iTrader: (5)

With the bigger cubes and large bore, the LS3 heads will benefit more than the LS2 top end and be a very budget setup.

If you got the coin for some nice AFRs then do those, but for 1/3rd the price you can't beat the LS3 potential.

stang_kllr

iTrader: (6)

have you considered sending your 243s to advanced induction for milling and porting?

Blackpanther99

iTrader: (8)

Run on sentences much? Lol

kingsize513

they already been ported n polished by bully performance out of Michigan. they did a stage 2.5 on them

kingsize513

man im very sorry about my grammar and my punctuation i have always been bad at comp lol sorry again

kingsize513

its not breaking down, its not making the power it should

Orange Juice

iTrader: (3)

Your heads and valves should be matched to the displacement with a cam matched to the heads. Its important that the the complete combination be matched.

kingsize513

thats where i made a mistake not matching things up. i'm going to redo the top end and match everything up together cam heads and all.

82cetuner

iTrader: (9)

You are not going to see 500rwhp out of that setup period, i got 10 more cubes, way better flowing ls3 heads, bigger cam, better headers, intake and I see somewhere around 530rwhp on a dynojet now.

your setup SHOULD make around 450, the injectors are holding you back change those out and you should see some HP, WE NEED MORE INFO though, at what RPM is this thing making power? is it leveling off early or what. my 418 was leveling off at 4500 and only made 400hp first time out, foudn out the fuel pump was no good out of the box and was dropping pressure after 4500rpms you may have the same issue, if you really want to see better top end power get rid of the 243s and get some ls3 heads, they are better designed for bigger cubes, 243s only flow so well on bigger cubes

kingsize513

around 5000 rpm it made 377 hp and 400 fbt. and the power levels out after that. the first run it made 370 and the power dropped at 4500 rpms. after the guy tuned it little bit better the power band leveled out at 5000 rpm and it didnt drop. the tuner told me that my throttle body is bad and it have to be swapped out. i wonder if that causes it not to make that power it should. and it was a dynojet setup also

Blackpanther99

iTrader: (8)

its all good.

kingsize513

what do you guys think about the hpe megadeath cam???

Orange Juice

iTrader: (3)

Injectors are holding you back, but if the heads havn't been milled for the extra bore then you will have shrouding. 243's that have been gone over properly should give you good results. Remember a few years ago they were all that was available and people made good power with them. If the head work that has been done was for a stock 347 then that could be part of the issue.

kingsize513

the heads had a stage 2 port and polish and valve job 2.02 in 1.06 ex and the block is lq4 iron block stroked to a 408 only thing stock is the injectors man