Question 383 stroker heads??? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 12 (permalink) Old 11-18-2012, 08:20 PM Thread Starter
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383 stroker heads???

Hello I have a recently built 383 lt1 that was dyno tuned and made 351 hp to the rear wheel with stock head opened up as much as my machine shop could and a stock intake opened up as much as it can to match an lt4 intake. I had a set of trick flow 195cc heads i bought after motor was in car and running but my motor guy said wouldnt notice much difference from the ones on it.

Wondering if heads and a real lt4 intake would make a huge difference or not....also how big i should go on the heads......been thinking like 210's

Has a comp cam xfi280 in in it

Last edited by 94z28 383; 11-18-2012 at 08:23 PM.
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post #2 of 12 (permalink) Old 11-19-2012, 07:02 AM
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What else was done to this 383? Cam, bolt-on's? 351 HP is low for a 383 w/max ported heads. People with stock bottom ends and a good set of heads put down over 400. The TFS heads are a very good head. Some claim they don't perform well out of the box but don't believe everything you hear. Now if you take those TFS send them out to be ported to a professional porter and get a matching cam you will be well over 425 HP.

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post #3 of 12 (permalink) Old 11-19-2012, 09:24 AM
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Put those heads on...! Trick Flows are a very nice head! I'm partial to AFR's, but TFS makes an outstanding head as well. If you already have a set of TFS 195's, I'd certainly put them on! I would be a bit hesitant to go with 210's on a 383, unless you're going for an all-out, max effort engine, which you would not be with that cam. 210cc's is pretty big...

I would use those heads and an Edelbrock LT4 intake. (Good luck tracking down an actual GM LT4 intake for less than the $500 that the Edelbrock costs.) The Edelbrock is a very nice piece, but it's not really a performance advantage over a GM LT4 intake. It's just that you'll have to search high and low for a GM intake and Summit has the Edelbrocks in stock...

Once you get the heads and upper end sorted out, tune...tune...tune...! Everything is a package and needs to be dialed in as such. Make sure your injectors are of adequate size. You should have at least 32 lb injectors for that setup or you WILL lean out up top. 36's would be optimal, though.

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post #4 of 12 (permalink) Old 11-19-2012, 10:04 AM
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I would be sick to my stomach if I had just dropped all that money to have a 383 built and it only put down what a cam only stock long block does. Post more details on the build, what parts were used, what compression, any flow data on the heads that are currently on it, who did the tune, and lets see if we cant get you over that 400 hp hump.

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post #5 of 12 (permalink) Old 11-19-2012, 10:12 AM
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Quote:
Originally Posted by 94z28 383 View Post
......stock head opened up as much as my machine shop could.....
'Max' porting' isn't neccessarily GOOD porting......and I'd bet ya $100 that the machine shop did such a poor job of porting those heads that they ruined them.

If I were you......I'd never have them do another set for me.

'Max porting' isn't neccessarily GOOD porting.


Now.....here's my question......do you know what your compression ratio would be with a .030" head gasket and a 54cc combustion chamber?


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post #6 of 12 (permalink) Old 11-19-2012, 10:14 AM
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Quote:
Originally Posted by Dynamic396 View Post
......I would use those heads and an Edelbrock LT4 intake. (Good luck tracking down an actual GM LT4 intake for less than the $500 that the Edelbrockcosts.).......
I happen to have a LT4 intake that I'd be willing to part with......jus' sayin'...

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post #7 of 12 (permalink) Old 11-19-2012, 10:35 AM
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Go race it and see what it mph's.


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post #8 of 12 (permalink) Old 11-19-2012, 05:53 PM Thread Starter
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Yea i was a disappointed at the dyno numbers but kinda went cheap on the top end....it was tuned at finishline performance in a suburb of chicago.....have pacesetter long tubes, comp cam xfi 280, k&n cold air intake, 58mm throttle body, new gm opti spark, push rods/rockers ect. to go with cam, had slp loudmouth but threw a moroso bullet muffler on cuz to loud no cat, stock rear end (bad), spec stage 3+ clutch with lightweight flywheel, bigger fuel pump, no grip right now spins first and second threw most of gear so need to get traction before more horse but seemed like that 383 should have more horse.....

Ive sold the heads i had about 3 months ago because I was told they wouldnt make much difference (stupid me)

Not sure on compression or head gaskets gain on going to the 030 would engine shop know?....

How much for the intake?

Injectors are big....can remember how many lbs but over 36lbs

My local drag strips last weekend was 2 weekends ago missed out on running it this summer worked every weekend so do not know what it would run right now

What should i buy for heads leaving the cam i have in....would get the lt4 or equivalent intake....like the car streetable

Last edited by 94z28 383; 11-19-2012 at 06:17 PM.
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post #9 of 12 (permalink) Old 11-19-2012, 06:57 PM
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The heads I would use are the AFR 195's for your set-up. But with out further details on your build its hard to say if you should get the street port or competition ported ones. We really need more info.

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post #10 of 12 (permalink) Old 11-19-2012, 07:06 PM Thread Starter
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Any info i can find out from the engine builder to help.....210's too big from what i hear.....didnt know afr made two different 195's
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post #11 of 12 (permalink) Old 11-19-2012, 07:58 PM
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The street ported are more for the mildly modified/ bolt on car where the competition ported are more for the built engines looking to use all the CFM that is capable in their setup. Competition ported suited my needs as my build is 383,11.5:1 (California gas sucks), 1300 CFM TB and ported intake, LT, Hi flow cats, no egr etc, to be tuned by PCMforless (to get it started). This is a budget build that will satisfy my tastes. It is being built with reliability in mind so I didnt get to wild.

96 WS6..Ported stock intake w/58mm TB, 4bolt, 4340 SCAT RA/H-Beams/pistons, AFR195 Comp 58cc, ISKY Billet Steel 244/258 .600/.600, 1.5 Comp Magnum RR, CM PR's, Bal W/I 1/2 gram w/1725 Bob Weight.http://www.youtube.com/watch?v=G-DpZpTcJaA
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post #12 of 12 (permalink) Old 11-20-2012, 09:56 AM
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Quote:
Originally Posted by 94z28 383 View Post
.............Not sure on compression or head gaskets gain on going to the 030 would engine shop know?....
The engine shop will if they have the specs on your engine. They'll need to have the engone deck height......how much the deck is higher than the piston crown at top dead center. And the negative cc's on the piston's valve reliefs.....assuming that you have flat top pistons.

If they don't have this information (a bad thing) then the only way to get this info is to pull a head and take measurements.

Quote:
Originally Posted by 94z28 383 View Post
.....How much for the intake?.......
I'll PM you.....

Quote:
Originally Posted by 94z28 383 View Post
......What should i buy for heads leaving the cam i have in.....
Personally......I don't give cam advice on high-performance builds unless I know two things......compression ratio and engine quench. And those unknowns can only be supplied buy your engine builder if they still have your engine's specs......or buy pulling a head and taking measurements.

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