408, L92 heads, what intake?
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TECH Junkie
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408, L92 heads, what intake? What would be a good intake for a 408. I am leaning to the GMMP carb intake so that I can spin it past 6100. I am in the process of doing reasearch on what combos are working and then buy something.
From the reading I have done it seems like the GMMP intake is my best bet, but I would always like to hear other peoples comments.
I will be putting nasty cam and hopefully hitting it with a 200-300 progressive shot.
From the reading I have done it seems like the GMMP intake is my best bet, but I would always like to hear other peoples comments.
I will be putting nasty cam and hopefully hitting it with a 200-300 progressive shot.
I have a Z06 on the dyno right now that I did the motor on. It is a 402, PRC L92 heads, L76 intake, and a healthy stick. I was working on the part throttle stuff Friday and made a low timing, rich, 4500 rpm pull and it making really nice power. I'll know later in the week how far the L76 will let it go with ported heads and a large cam.
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TECH Junkie
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From: Fort Myers, FL.
I was wondering how the L76 can actually keep up at higher RPM's, and wonder if porting it would help or if I should just look at the GMMP.
Let us know the results
Let us know the results
I just did a quick google, and i came up with something that might help.
http://www.gmhightechperformance.com...ads/index.html
http://www.gmhightechperformance.com...ads/index.html
no ones really porting the l76s from what i was told they are port matching which has a small benefit if any to me the l76 is more visually appealing until some nubmers are confirmed on the new weiand intake or the fast intakes for the l92 heads still dont think the l76 is that baad of a choice either. thats what i have on my 414
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I have talk to some people about the FAST intake for my 455 LSX I am buiding who say it will be out in a matter of months.Weather it is true or not I dont know...just thought I would throw it in there.
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FWIW, I have a 375CI iron motor (.060 over 6L) w/ a comp 236/242 640/647 114cam, TSP CNC'D L92's, L76 and old grotyohahn 1-3/4" headers. I spin my car to 6800 N/A and it makes peak HP @ 6500, on the jug I spin it 7K. I dont know if I got lucky and the intake works with my setup or? but I dont die @ 6100 Im actually still climbing????
I make 440 RWHP thru a 4L80E & 9" w/ spool and 35 spline stuff. I wouldn't be afraid to use the L76 again from my experience.
I make 440 RWHP thru a 4L80E & 9" w/ spool and 35 spline stuff. I wouldn't be afraid to use the L76 again from my experience.
Teching In
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FWIW, I have a 375CI iron motor (.060 over 6L) w/ a comp 236/242 640/647 114cam, TSP CNC'D L92's, L76 and old grotyohahn 1-3/4" headers. I spin my car to 6800 N/A and it makes peak HP @ 6500, on the jug I spin it 7K. I dont know if I got lucky and the intake works with my setup or? but I dont die @ 6100 Im actually still climbing????
I make 440 RWHP thru a 4L80E & 9" w/ spool and 35 spline stuff. I wouldn't be afraid to use the L76 again from my experience.
I make 440 RWHP thru a 4L80E & 9" w/ spool and 35 spline stuff. I wouldn't be afraid to use the L76 again from my experience.
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TECH Junkie
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From: Fort Myers, FL.
Combo is definatly the key word.
I won't be buying anything till summer as that is the down time here in south Florida, so hoefully something new comes to the market.
I won't be buying anything till summer as that is the down time here in south Florida, so hoefully something new comes to the market.
Teching In
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also, for purposes of 'do i have the right combo', its not the HP curve you look at, its the TQ curve. WHere it drops, you ran out of air. HP still climbs as TQ drops because HP is not measured, its calulated. (TQ x RPM)/5252= HP.
